TY  - JOUR
AU  - Onda, Shinichiro
AU  - Hosoda, Takashi
AU  - Jaćimović, Nenad
AU  - Kimura, Ichiro
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1119
T2  - Journal of Hydraulic Research
T1  - Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching
EP  - 25
IS  - 1
SP  - 13
VL  - 57
DO  - 10.1080/00221686.2018.1442882
ER  - 

@article{
author = "Onda, Shinichiro and Hosoda, Takashi and Jaćimović, Nenad and Kimura, Ichiro",
year = "2019",
journal = "Journal of Hydraulic Research",
title = "Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching",
pages = "25-13",
number = "1",
volume = "57",
doi = "10.1080/00221686.2018.1442882"
}

Onda, S., Hosoda, T., Jaćimović, N.,& Kimura, I.. (2019). Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching. in Journal of Hydraulic Research, 57(1), 13-25.
https://doi.org/10.1080/00221686.2018.1442882

Onda S, Hosoda T, Jaćimović N, Kimura I. Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching. in Journal of Hydraulic Research. 2019;57(1):13-25.
doi:10.1080/00221686.2018.1442882 .

Onda, Shinichiro, Hosoda, Takashi, Jaćimović, Nenad, Kimura, Ichiro, "Numerical modelling of simultaneous overtopping and seepage flows with application to dike breaching" in Journal of Hydraulic Research, 57, no. 1 (2019):13-25,
https://doi.org/10.1080/00221686.2018.1442882 . .

TY  - JOUR
AU  - Jaćimović, Nenad
AU  - Hosoda, Takashi
AU  - Park, Ho-Dong
AU  - Ivetić, Marko
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/866
AB  - The paper presents a novel method for hypolimnetic oxygenation by electrolysis of water. The performance of the method is investigated by the laboratory and the field experiment. The laboratory experiment is conducted in a 90 L vessel, while the field experiment is conducted at the lake Biwa in Japan. In order to provide a better insight into involved processes, a numerical model for simulation of bubble flow is developed with consideration of gas compressibility and oxygen dissolution. The model simultaneously solves 3-D volume averaged two-fluid governing equations. Developed model is firstly verified by simulation of bubble flow experiments, reported in the literature, where good qualitative agreement between measured and simulated results is observed In the second part, the model is applied for simulation of conducted water electrolysis experiments. The model reproduced the observed oxygen concentration dynamics reasonably well.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical modeling of hypolimnetic oxygenation by electrolysis of water
VL  - 21
DO  - 10.2298/TSCI160201190J
ER  - 

@article{
author = "Jaćimović, Nenad and Hosoda, Takashi and Park, Ho-Dong and Ivetić, Marko",
year = "2017",
abstract = "The paper presents a novel method for hypolimnetic oxygenation by electrolysis of water. The performance of the method is investigated by the laboratory and the field experiment. The laboratory experiment is conducted in a 90 L vessel, while the field experiment is conducted at the lake Biwa in Japan. In order to provide a better insight into involved processes, a numerical model for simulation of bubble flow is developed with consideration of gas compressibility and oxygen dissolution. The model simultaneously solves 3-D volume averaged two-fluid governing equations. Developed model is firstly verified by simulation of bubble flow experiments, reported in the literature, where good qualitative agreement between measured and simulated results is observed In the second part, the model is applied for simulation of conducted water electrolysis experiments. The model reproduced the observed oxygen concentration dynamics reasonably well.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical modeling of hypolimnetic oxygenation by electrolysis of water",
volume = "21",
doi = "10.2298/TSCI160201190J"
}

Jaćimović, N., Hosoda, T., Park, H.,& Ivetić, M.. (2017). Numerical modeling of hypolimnetic oxygenation by electrolysis of water. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 21.
https://doi.org/10.2298/TSCI160201190J

Jaćimović N, Hosoda T, Park H, Ivetić M. Numerical modeling of hypolimnetic oxygenation by electrolysis of water. in Thermal Science. 2017;21.
doi:10.2298/TSCI160201190J .

Jaćimović, Nenad, Hosoda, Takashi, Park, Ho-Dong, Ivetić, Marko, "Numerical modeling of hypolimnetic oxygenation by electrolysis of water" in Thermal Science, 21 (2017),
https://doi.org/10.2298/TSCI160201190J . .

TY  - CONF
AU  - Onda, S.
AU  - Hosoda, Takashi
AU  - Jaćimović, Nenad
AU  - Kimura, I.
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/743
AB  - Dike failures due to overtopping flows cause severe damages. For risk management, it is of great importance to understand the mechanism of dike failure and predict flows and sediment transport in the breaching process accurately. In this study, numerical simulation of cross-levee breaching process is carried out by using a 3D flow model in porous media and density function methods, and a non-equilibrium sediment transport model. A simplified sediment collapse model is also incorporated in the numerical simulation. The developed model is applied to the levee breach in the small scale hydraulic experiment. Comparing with the previous experimental results, it is shown that the numerical model can reproduce the widening process of dike failure reasonably well.
PB  - CRC Press/Balkema
C3  - River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
T1  - 3D numerical simulation of cross-levee breaching process due to overtopping flow
EP  - 1771
SP  - 1764
UR  - https://hdl.handle.net/21.15107/rcub_grafar_743
ER  - 

@conference{
author = "Onda, S. and Hosoda, Takashi and Jaćimović, Nenad and Kimura, I.",
year = "2016",
abstract = "Dike failures due to overtopping flows cause severe damages. For risk management, it is of great importance to understand the mechanism of dike failure and predict flows and sediment transport in the breaching process accurately. In this study, numerical simulation of cross-levee breaching process is carried out by using a 3D flow model in porous media and density function methods, and a non-equilibrium sediment transport model. A simplified sediment collapse model is also incorporated in the numerical simulation. The developed model is applied to the levee breach in the small scale hydraulic experiment. Comparing with the previous experimental results, it is shown that the numerical model can reproduce the widening process of dike failure reasonably well.",
publisher = "CRC Press/Balkema",
journal = "River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016",
title = "3D numerical simulation of cross-levee breaching process due to overtopping flow",
pages = "1771-1764",
url = "https://hdl.handle.net/21.15107/rcub_grafar_743"
}

Onda, S., Hosoda, T., Jaćimović, N.,& Kimura, I.. (2016). 3D numerical simulation of cross-levee breaching process due to overtopping flow. in River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
CRC Press/Balkema., 1764-1771.
https://hdl.handle.net/21.15107/rcub_grafar_743

Onda S, Hosoda T, Jaćimović N, Kimura I. 3D numerical simulation of cross-levee breaching process due to overtopping flow. in River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016. 2016;:1764-1771.
https://hdl.handle.net/21.15107/rcub_grafar_743 .

Onda, S., Hosoda, Takashi, Jaćimović, Nenad, Kimura, I., "3D numerical simulation of cross-levee breaching process due to overtopping flow" in River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016 (2016):1764-1771,
https://hdl.handle.net/21.15107/rcub_grafar_743 .

TY  - JOUR
AU  - Onda, Shinichiro
AU  - Hosoda, Takashi
AU  - Jaćimović, Nenad
AU  - Kimura, Ichiro
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1057
T2  - Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
T1  - Development and application of numerical method in open channel flow in boundary fitted coordinate system with density function method
EP  - 510
IS  - 4
SP  - 505
VL  - 72
DO  - 10.2208/jscejhe.72.I_505
ER  - 

@article{
author = "Onda, Shinichiro and Hosoda, Takashi and Jaćimović, Nenad and Kimura, Ichiro",
year = "2016",
journal = "Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)",
title = "Development and application of numerical method in open channel flow in boundary fitted coordinate system with density function method",
pages = "510-505",
number = "4",
volume = "72",
doi = "10.2208/jscejhe.72.I_505"
}

Onda, S., Hosoda, T., Jaćimović, N.,& Kimura, I.. (2016). Development and application of numerical method in open channel flow in boundary fitted coordinate system with density function method. in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 72(4), 505-510.
https://doi.org/10.2208/jscejhe.72.I_505

Onda S, Hosoda T, Jaćimović N, Kimura I. Development and application of numerical method in open channel flow in boundary fitted coordinate system with density function method. in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering). 2016;72(4):505-510.
doi:10.2208/jscejhe.72.I_505 .

Onda, Shinichiro, Hosoda, Takashi, Jaćimović, Nenad, Kimura, Ichiro, "Development and application of numerical method in open channel flow in boundary fitted coordinate system with density function method" in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 72, no. 4 (2016):505-510,
https://doi.org/10.2208/jscejhe.72.I_505 . .

TY  - JOUR
AU  - Shinichiro, O.N.D.A.
AU  - Hosoda, Takashi
AU  - Jaćimović, Nenad
AU  - Kimura, Ichiro
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1039
T2  - Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
T1  - Numerical simulation of levee breach due to overtopping flow
EP  - 918
IS  - 4
SP  - 913
VL  - 71
DO  - 10.2208/jscejhe.71.I_913
ER  - 

@article{
author = "Shinichiro, O.N.D.A. and Hosoda, Takashi and Jaćimović, Nenad and Kimura, Ichiro",
year = "2015",
journal = "Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)",
title = "Numerical simulation of levee breach due to overtopping flow",
pages = "918-913",
number = "4",
volume = "71",
doi = "10.2208/jscejhe.71.I_913"
}

Shinichiro, O.N.D.A., Hosoda, T., Jaćimović, N.,& Kimura, I.. (2015). Numerical simulation of levee breach due to overtopping flow. in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 71(4), 913-918.
https://doi.org/10.2208/jscejhe.71.I_913

Shinichiro O, Hosoda T, Jaćimović N, Kimura I. Numerical simulation of levee breach due to overtopping flow. in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering). 2015;71(4):913-918.
doi:10.2208/jscejhe.71.I_913 .

Shinichiro, O.N.D.A., Hosoda, Takashi, Jaćimović, Nenad, Kimura, Ichiro, "Numerical simulation of levee breach due to overtopping flow" in Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 71, no. 4 (2015):913-918,
https://doi.org/10.2208/jscejhe.71.I_913 . .

TY  - JOUR
AU  - Onda, Shinichiro
AU  - Hosoda, Takashi
AU  - Jaćimović, Nenad
AU  - Kimura, Ichiro
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1010
AB  - Dike failures due to overtopping flows have recently occurred during floods. It is of great importance to understand the mechanism of dike failure processes and to predict dike erosion accurately for disaster mitigation. In this study, a numerical model to simulate dike breaching is developed based on a three-dimensional flow model in porous media and density function methods, and a non-equilibrium sediment transport model. Infiltration into a dike is also considered in the simulation. First, a numerical model is applied to flows over a solid embankment in order to validate the flow model. Then, dike erosion processes are simulated. Compared with the previous experimental results, it is shown that the numerical model can reproduce overflows and dike failure processes reasonably.
T2  - Journal of JSCE
T1  - Numerical simulation of dike erosion process due to overtopping flow
EP  - 175
IS  - 1
SP  - 168
VL  - 2
DO  - 10.2208/journalofjsce.2.1_168
ER  - 

@article{
author = "Onda, Shinichiro and Hosoda, Takashi and Jaćimović, Nenad and Kimura, Ichiro",
year = "2014",
abstract = "Dike failures due to overtopping flows have recently occurred during floods. It is of great importance to understand the mechanism of dike failure processes and to predict dike erosion accurately for disaster mitigation. In this study, a numerical model to simulate dike breaching is developed based on a three-dimensional flow model in porous media and density function methods, and a non-equilibrium sediment transport model. Infiltration into a dike is also considered in the simulation. First, a numerical model is applied to flows over a solid embankment in order to validate the flow model. Then, dike erosion processes are simulated. Compared with the previous experimental results, it is shown that the numerical model can reproduce overflows and dike failure processes reasonably.",
journal = "Journal of JSCE",
title = "Numerical simulation of dike erosion process due to overtopping flow",
pages = "175-168",
number = "1",
volume = "2",
doi = "10.2208/journalofjsce.2.1_168"
}

Onda, S., Hosoda, T., Jaćimović, N.,& Kimura, I.. (2014). Numerical simulation of dike erosion process due to overtopping flow. in Journal of JSCE, 2(1), 168-175.
https://doi.org/10.2208/journalofjsce.2.1_168

Onda S, Hosoda T, Jaćimović N, Kimura I. Numerical simulation of dike erosion process due to overtopping flow. in Journal of JSCE. 2014;2(1):168-175.
doi:10.2208/journalofjsce.2.1_168 .

Onda, Shinichiro, Hosoda, Takashi, Jaćimović, Nenad, Kimura, Ichiro, "Numerical simulation of dike erosion process due to overtopping flow" in Journal of JSCE, 2, no. 1 (2014):168-175,
https://doi.org/10.2208/journalofjsce.2.1_168 . .

TY  - JOUR
AU  - Jaćimović, Nenad
AU  - Hosoda, Takashi
AU  - Ivetić, Marko
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/310
AB  - One of available lake restoration technologies is injection of compressed air or oxygen into a hypolimnion, promoting vertical mixing of water and dissolution of oxygen. A numerical model has been developed for simulation of bubble flow, with consideration of gas compressibility and oxygen dissolution. Developed model is intended to be utilized for simulation of lakes DO recovery. Model is firstly verified by simulation of bubble flow experiments, reported in the literature, where very good quantitative and qualitative agreement between measured and simulated results is observed. Both flow configurations are tested: in which steady state is achieved, and where steady conditions can not develop. In the second part, model is applied for simulation of conducted experiments where oxygen dissolution has been considered. The paper presents simulation results, where good agreement of simulated and measured quantities is observed.
AB  - Jedna od raspoložovih tehnologija za poboljšanje kvaliteta vode u jezerima i akumulacijama predstavlja utiskivanje vazduha, odnosno kiseonika, u dublje slojeve vode (hipolimnion), čime se podstiče mešanje vode po vertikalnoj osi i ostvaruje transfer kiseonika iz gasne faze u vodu. U radu se prikazuje razvijeni 3D numerički model za simulaciju dvofaznog strujanja gasa i vode, kojim su obuhvaćeni i uticaji stišljivosti vazduha, kao i transfer mase između vazduha i vode. Model je najpre verifikovan simulacijom nekoliko eksperimenata iz literature, gde su poređeni podaci o distribuciji vazduha i brzine vode nakon utiskivanja vazduha u vodom ispunjen sud sa rezultatima simulacije. Pri tome, simulirani su uslovi strujanja gde se postiže kvazi-ustaljeno strujanje, kao i eksperimenti u kojima takvo strujanje ne može da se ostvari. U drugom delu, model je korišćen za simulaciju sprovedenih eksperimenata u kojima je osmatran porast koncentracija rastvorenog kiseonika tokom utiskivanja vazduha. U radu se prikazuju rezultati ovih simulacija, gde se mogu konstatovati zadovoljavajuća slaganja izmerenih i sračunatih veličina.
PB  - Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd
T2  - Voda i sanitarna tehnika
T1  - Numerical modeling of two phase flow (water-air) after air injection into the water
T1  - Modeliranje dvofaznog strujanja (vode i vazduha) nakon utiskivanja vazduha u vodu
EP  - 10
IS  - 2
SP  - 3
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_grafar_310
ER  - 

@article{
author = "Jaćimović, Nenad and Hosoda, Takashi and Ivetić, Marko",
year = "2010",
abstract = "One of available lake restoration technologies is injection of compressed air or oxygen into a hypolimnion, promoting vertical mixing of water and dissolution of oxygen. A numerical model has been developed for simulation of bubble flow, with consideration of gas compressibility and oxygen dissolution. Developed model is intended to be utilized for simulation of lakes DO recovery. Model is firstly verified by simulation of bubble flow experiments, reported in the literature, where very good quantitative and qualitative agreement between measured and simulated results is observed. Both flow configurations are tested: in which steady state is achieved, and where steady conditions can not develop. In the second part, model is applied for simulation of conducted experiments where oxygen dissolution has been considered. The paper presents simulation results, where good agreement of simulated and measured quantities is observed., Jedna od raspoložovih tehnologija za poboljšanje kvaliteta vode u jezerima i akumulacijama predstavlja utiskivanje vazduha, odnosno kiseonika, u dublje slojeve vode (hipolimnion), čime se podstiče mešanje vode po vertikalnoj osi i ostvaruje transfer kiseonika iz gasne faze u vodu. U radu se prikazuje razvijeni 3D numerički model za simulaciju dvofaznog strujanja gasa i vode, kojim su obuhvaćeni i uticaji stišljivosti vazduha, kao i transfer mase između vazduha i vode. Model je najpre verifikovan simulacijom nekoliko eksperimenata iz literature, gde su poređeni podaci o distribuciji vazduha i brzine vode nakon utiskivanja vazduha u vodom ispunjen sud sa rezultatima simulacije. Pri tome, simulirani su uslovi strujanja gde se postiže kvazi-ustaljeno strujanje, kao i eksperimenti u kojima takvo strujanje ne može da se ostvari. U drugom delu, model je korišćen za simulaciju sprovedenih eksperimenata u kojima je osmatran porast koncentracija rastvorenog kiseonika tokom utiskivanja vazduha. U radu se prikazuju rezultati ovih simulacija, gde se mogu konstatovati zadovoljavajuća slaganja izmerenih i sračunatih veličina.",
publisher = "Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd",
journal = "Voda i sanitarna tehnika",
title = "Numerical modeling of two phase flow (water-air) after air injection into the water, Modeliranje dvofaznog strujanja (vode i vazduha) nakon utiskivanja vazduha u vodu",
pages = "10-3",
number = "2",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_grafar_310"
}

Jaćimović, N., Hosoda, T.,& Ivetić, M.. (2010). Numerical modeling of two phase flow (water-air) after air injection into the water. in Voda i sanitarna tehnika
Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd., 40(2), 3-10.
https://hdl.handle.net/21.15107/rcub_grafar_310

Jaćimović N, Hosoda T, Ivetić M. Numerical modeling of two phase flow (water-air) after air injection into the water. in Voda i sanitarna tehnika. 2010;40(2):3-10.
https://hdl.handle.net/21.15107/rcub_grafar_310 .

Jaćimović, Nenad, Hosoda, Takashi, Ivetić, Marko, "Numerical modeling of two phase flow (water-air) after air injection into the water" in Voda i sanitarna tehnika, 40, no. 2 (2010):3-10,
https://hdl.handle.net/21.15107/rcub_grafar_310 .

TY  - JOUR
AU  - Jaćimović, Nenad
AU  - Hosoda, Takashi
AU  - Ivetić, Marko
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/309
AB  - The paper deals with modeling of two phase (water-air) flow in coarse porous medium, where, after reaching some air velocity, instability of the flow occurs. Firstly, a linear stability analysis has been conducted for one-dimensional macroscopic model, which revealed that capillary forces are stability factor, while inertial forces promote instability. Utilizing two, the most frequently applied constitutive models for capillarity-saturation relation; it is found that instability may be expected in materials with representative grain size of 2 mm and greater. In the case of smaller grain size, instability can not occur, regardless of imposed air flow rate. In addition, the paper presents developed numerical model for simulation of two phase flow in porous media with consideration of complete momentum equations. The model is applied on reported laboratory experiments, where observed instability was successfully reproduced.
AB  - U radu se modelira dvofazno tečenje vode i vazduha u krupnozrnoj poroznoj sredini gde je, pri određenim brzinama vazduha, osmotrena pojava nestabilnog tečenja. Najpre, sprovedena je linearna analiza stabilnosti zapreminski osrednjenih jednačina, koja je pokazala da osnovni stabilizirajući faktor predstavljaju kapilarne sile, dok inercijalne sile promovišu nestabilnost pri tečenju. Korišćenjem dva najčešće korišćena konstitutivna modela za funkcionalnu zavisnost kapilarnog pritiska i zasićenosti porozne sredine, utvrđeno je se pojava nestabilnosti može očekivati kod materijala reprezentativne krupnoće zrna veće od 2 mm. Kod manje krupnoće, pokazano je da do nestabilnog tečenja ne može da dođe, bez obzira na nametnutu brzinu vazdušne faze. U okviru rada, razvijen je i numerički model za rešavanje dvofaznog tečenja rešavanjem kompletnih dinamičkih jednačina za obe faze (voda i vazduh), a koji je primenjen za simulaciju objavljenih laboratorijskih eksperimenata iz literature. Model uspešno reprodukuje pojavu nestabilnog tečenja.
PB  - Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd
T2  - Voda i sanitarna tehnika
T1  - Instability analysis of the air-water flow in porous medium
T1  - Analiza pojave nestabilnosti kod dvofaznog strujanja u poroznoj sredini
EP  - 40
IS  - 1
SP  - 35
VL  - 40
UR  - https://hdl.handle.net/21.15107/rcub_grafar_309
ER  - 

@article{
author = "Jaćimović, Nenad and Hosoda, Takashi and Ivetić, Marko",
year = "2010",
abstract = "The paper deals with modeling of two phase (water-air) flow in coarse porous medium, where, after reaching some air velocity, instability of the flow occurs. Firstly, a linear stability analysis has been conducted for one-dimensional macroscopic model, which revealed that capillary forces are stability factor, while inertial forces promote instability. Utilizing two, the most frequently applied constitutive models for capillarity-saturation relation; it is found that instability may be expected in materials with representative grain size of 2 mm and greater. In the case of smaller grain size, instability can not occur, regardless of imposed air flow rate. In addition, the paper presents developed numerical model for simulation of two phase flow in porous media with consideration of complete momentum equations. The model is applied on reported laboratory experiments, where observed instability was successfully reproduced., U radu se modelira dvofazno tečenje vode i vazduha u krupnozrnoj poroznoj sredini gde je, pri određenim brzinama vazduha, osmotrena pojava nestabilnog tečenja. Najpre, sprovedena je linearna analiza stabilnosti zapreminski osrednjenih jednačina, koja je pokazala da osnovni stabilizirajući faktor predstavljaju kapilarne sile, dok inercijalne sile promovišu nestabilnost pri tečenju. Korišćenjem dva najčešće korišćena konstitutivna modela za funkcionalnu zavisnost kapilarnog pritiska i zasićenosti porozne sredine, utvrđeno je se pojava nestabilnosti može očekivati kod materijala reprezentativne krupnoće zrna veće od 2 mm. Kod manje krupnoće, pokazano je da do nestabilnog tečenja ne može da dođe, bez obzira na nametnutu brzinu vazdušne faze. U okviru rada, razvijen je i numerički model za rešavanje dvofaznog tečenja rešavanjem kompletnih dinamičkih jednačina za obe faze (voda i vazduh), a koji je primenjen za simulaciju objavljenih laboratorijskih eksperimenata iz literature. Model uspešno reprodukuje pojavu nestabilnog tečenja.",
publisher = "Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd",
journal = "Voda i sanitarna tehnika",
title = "Instability analysis of the air-water flow in porous medium, Analiza pojave nestabilnosti kod dvofaznog strujanja u poroznoj sredini",
pages = "40-35",
number = "1",
volume = "40",
url = "https://hdl.handle.net/21.15107/rcub_grafar_309"
}

Jaćimović, N., Hosoda, T.,& Ivetić, M.. (2010). Instability analysis of the air-water flow in porous medium. in Voda i sanitarna tehnika
Udruženje za tehnologiju vode i sanitarno inžinjerstvo, Beograd., 40(1), 35-40.
https://hdl.handle.net/21.15107/rcub_grafar_309

Jaćimović N, Hosoda T, Ivetić M. Instability analysis of the air-water flow in porous medium. in Voda i sanitarna tehnika. 2010;40(1):35-40.
https://hdl.handle.net/21.15107/rcub_grafar_309 .

Jaćimović, Nenad, Hosoda, Takashi, Ivetić, Marko, "Instability analysis of the air-water flow in porous medium" in Voda i sanitarna tehnika, 40, no. 1 (2010):35-40,
https://hdl.handle.net/21.15107/rcub_grafar_309 .

TY  - CONF
AU  - Jaćimović, Nenad
AU  - Ivetić, Marko
AU  - Hosoda, Takashi
AU  - Park, Ho-Dong
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/327
AB  - One of available lake restoration technologies is injection of compressed air or oxygen into a hypolimnion, promoting vertical mixing of water and dissolution of oxygen.A numerical model has been developed for simulation of bubble flow, with consideration of gas compressibility and oxygen dissolution. The developed model is intended to be utilized for simulation of lakes DO recovery. The model is firstly verified by simulation of bubble flow experiments, reported in the literature, where very good quantitative and qualitative agreement between measured and simulated results is observed. Both flowconfigurations are tested: inwhich steady state is achieved, andwhere steady conditions can not develop. In the second part, model is applied for simulation of conducted experiments where oxygen dissolution has been considered. The paper presents simulation results, where good agreement of simulated and measured quantities is observed.
C3  - Environmental Hydraulics - Proceedings of the 6th International Symposium on Environmental Hydraulic
T1  - Numerical modeling of dissolved oxygen recovery during aeration in lakes
EP  - 734
SP  - 729
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_grafar_327
ER  - 

@conference{
author = "Jaćimović, Nenad and Ivetić, Marko and Hosoda, Takashi and Park, Ho-Dong",
year = "2010",
abstract = "One of available lake restoration technologies is injection of compressed air or oxygen into a hypolimnion, promoting vertical mixing of water and dissolution of oxygen.A numerical model has been developed for simulation of bubble flow, with consideration of gas compressibility and oxygen dissolution. The developed model is intended to be utilized for simulation of lakes DO recovery. The model is firstly verified by simulation of bubble flow experiments, reported in the literature, where very good quantitative and qualitative agreement between measured and simulated results is observed. Both flowconfigurations are tested: inwhich steady state is achieved, andwhere steady conditions can not develop. In the second part, model is applied for simulation of conducted experiments where oxygen dissolution has been considered. The paper presents simulation results, where good agreement of simulated and measured quantities is observed.",
journal = "Environmental Hydraulics - Proceedings of the 6th International Symposium on Environmental Hydraulic",
title = "Numerical modeling of dissolved oxygen recovery during aeration in lakes",
pages = "734-729",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_grafar_327"
}

Jaćimović, N., Ivetić, M., Hosoda, T.,& Park, H.. (2010). Numerical modeling of dissolved oxygen recovery during aeration in lakes. in Environmental Hydraulics - Proceedings of the 6th International Symposium on Environmental Hydraulic, 2, 729-734.
https://hdl.handle.net/21.15107/rcub_grafar_327

Jaćimović N, Ivetić M, Hosoda T, Park H. Numerical modeling of dissolved oxygen recovery during aeration in lakes. in Environmental Hydraulics - Proceedings of the 6th International Symposium on Environmental Hydraulic. 2010;2:729-734.
https://hdl.handle.net/21.15107/rcub_grafar_327 .

Jaćimović, Nenad, Ivetić, Marko, Hosoda, Takashi, Park, Ho-Dong, "Numerical modeling of dissolved oxygen recovery during aeration in lakes" in Environmental Hydraulics - Proceedings of the 6th International Symposium on Environmental Hydraulic, 2 (2010):729-734,
https://hdl.handle.net/21.15107/rcub_grafar_327 .

TY  - CONF
AU  - Jaćimović, Nenad
AU  - Hosoda, Takashi
AU  - Ivetić, Marko
PY  - 2009
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/252
AB  - The paper deals with modeling of two phase (water-air) flow in coarse porous medium, where, after reaching some air velocity, instability of the flow occurs. Firstly, a linear stability analysis has been conducted for onedimensional macroscopic model, which revealed that capillary forces are a stability factor, while inertial forces promote instability. Utilizing the two most frequently applied constitutive models for capillaritysaturation relation it was found that instability may be expected in materials with representative grain size of 2 mm and greater. In the case of smaller grain size, instability can not occur, regardless of the imposed air flow rate. In addition, the paper presents a newly developed numerical model for the simulation of two phase flow in porous media, with the consideration of complete momentum equations. Applied on the data of reported laboratory experiments the model successfully reproduced the observed instability of the flow.
AB  - U radu se modelira dvofazno tečenje vode i vazduha u krupnozrnoj poroznoj sredini gde je, pri određenim brzinama vazduha, osmotrena pojava nestabilnog tečenja. Najpre, sprovedena je linearna analiza stabilnosti zapreminski osrednjenih jednačina, koja je pokazala da osnovni stabilizirajući faktor predstavljaju kapilarne sile, dok inercijalne sile promovišu nestabilnost pri tečenju. Korišćenjem dva najčešće korišćena konstitutivna modela za funkcionalnu zavisnost kapilarnog pritiska i zasićenosti porozne sredine, utvrđeno je se pojava nestabilnosti može očekivati kod materijala reprezentativne krupnoće zrna veće od 2 mm. Kod manje krupnoće, pokazano je da do nestabilnog tečenja ne može da dođe, bez obzira na nametnutu brzinu vazdušne faze. U okviru rada, razvijen je i numerički model za rešavanje dvofaznog tečenja rešavanjem kompletnih dinamičkih jednačina za obe faze (voda i vazduh), a koji je primenjen za simulaciju objavljenih laboratorijskih eksperimenata iz literature. Model uspešno reprodukuje pojavu nestabilnog tečenja.
PB  - Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd
C3  - Vodoprivreda
T1  - Instability analysis of the air-water flow in porous medium
T1  - Analiza pojave nestabilnosti kod dvofaznog strujanja u poroznoj sredini
EP  - 157
IS  - 4-6
SP  - 151
VL  - 41
UR  - https://hdl.handle.net/21.15107/rcub_grafar_252
ER  - 

@conference{
author = "Jaćimović, Nenad and Hosoda, Takashi and Ivetić, Marko",
year = "2009",
abstract = "The paper deals with modeling of two phase (water-air) flow in coarse porous medium, where, after reaching some air velocity, instability of the flow occurs. Firstly, a linear stability analysis has been conducted for onedimensional macroscopic model, which revealed that capillary forces are a stability factor, while inertial forces promote instability. Utilizing the two most frequently applied constitutive models for capillaritysaturation relation it was found that instability may be expected in materials with representative grain size of 2 mm and greater. In the case of smaller grain size, instability can not occur, regardless of the imposed air flow rate. In addition, the paper presents a newly developed numerical model for the simulation of two phase flow in porous media, with the consideration of complete momentum equations. Applied on the data of reported laboratory experiments the model successfully reproduced the observed instability of the flow., U radu se modelira dvofazno tečenje vode i vazduha u krupnozrnoj poroznoj sredini gde je, pri određenim brzinama vazduha, osmotrena pojava nestabilnog tečenja. Najpre, sprovedena je linearna analiza stabilnosti zapreminski osrednjenih jednačina, koja je pokazala da osnovni stabilizirajući faktor predstavljaju kapilarne sile, dok inercijalne sile promovišu nestabilnost pri tečenju. Korišćenjem dva najčešće korišćena konstitutivna modela za funkcionalnu zavisnost kapilarnog pritiska i zasićenosti porozne sredine, utvrđeno je se pojava nestabilnosti može očekivati kod materijala reprezentativne krupnoće zrna veće od 2 mm. Kod manje krupnoće, pokazano je da do nestabilnog tečenja ne može da dođe, bez obzira na nametnutu brzinu vazdušne faze. U okviru rada, razvijen je i numerički model za rešavanje dvofaznog tečenja rešavanjem kompletnih dinamičkih jednačina za obe faze (voda i vazduh), a koji je primenjen za simulaciju objavljenih laboratorijskih eksperimenata iz literature. Model uspešno reprodukuje pojavu nestabilnog tečenja.",
publisher = "Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd",
journal = "Vodoprivreda",
title = "Instability analysis of the air-water flow in porous medium, Analiza pojave nestabilnosti kod dvofaznog strujanja u poroznoj sredini",
pages = "157-151",
number = "4-6",
volume = "41",
url = "https://hdl.handle.net/21.15107/rcub_grafar_252"
}

Jaćimović, N., Hosoda, T.,& Ivetić, M.. (2009). Instability analysis of the air-water flow in porous medium. in Vodoprivreda
Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd., 41(4-6), 151-157.
https://hdl.handle.net/21.15107/rcub_grafar_252

Jaćimović N, Hosoda T, Ivetić M. Instability analysis of the air-water flow in porous medium. in Vodoprivreda. 2009;41(4-6):151-157.
https://hdl.handle.net/21.15107/rcub_grafar_252 .

Jaćimović, Nenad, Hosoda, Takashi, Ivetić, Marko, "Instability analysis of the air-water flow in porous medium" in Vodoprivreda, 41, no. 4-6 (2009):151-157,
https://hdl.handle.net/21.15107/rcub_grafar_252 .

TY  - CONF
AU  - Jaćimović, Nenad
AU  - Hosoda, Takashi
AU  - Ivetić, Marko
AU  - Kishida, K.
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/165
AB  - The paper presents a mechanistic/deterministic model for simulation of mass removal during air sparging. From the point of numerical modeling, there are two issues considering air sparging: modeling of air flow and distribution and modeling of mass transport and transfer. Several processes, which are commonly neglected, such as air channeling and pollutant advection by the water phase, are taken into account. The numerical model presented in this paper considers all relevant for mass transfer during the air sparging. Model includes hydrodynamics of air and water phase; calculated air volume content is divided into a number of air channels surrounded by the water phase, which is divided into two compartments. First compartment is immobile and it is in contact with air phase, while the second compartment is mobile. This "mobile- immobile" formulation is a common approach for description of solute transport by groundwater. Mass transfer between two water compartments is modeled as a first order kinetic, where the mass transfer coefficient, representing diffusion and advection in the water phase towards the air channels, is parameter needed to be calibrated. Sorption for both water compartments is considered. The adopted model of contaminant evaporation at the air-water interface is verified by comparison with experimental results available from published sources. Model is used for simulation of two-dimensional air sparging laboratory experiment. Good overall agreement is observed. It is showed that the efficiency of air sparging can be influenced by natural groundwater flow.
C3  - Water Science and Technology: Water Supply
T1  - A novel approach in numerical simulation of contaminant removal by air sparging
EP  - 170
IS  - 3
SP  - 163
VL  - 7
DO  - 10.2166/ws.2007.079
ER  - 

@conference{
author = "Jaćimović, Nenad and Hosoda, Takashi and Ivetić, Marko and Kishida, K.",
year = "2007",
abstract = "The paper presents a mechanistic/deterministic model for simulation of mass removal during air sparging. From the point of numerical modeling, there are two issues considering air sparging: modeling of air flow and distribution and modeling of mass transport and transfer. Several processes, which are commonly neglected, such as air channeling and pollutant advection by the water phase, are taken into account. The numerical model presented in this paper considers all relevant for mass transfer during the air sparging. Model includes hydrodynamics of air and water phase; calculated air volume content is divided into a number of air channels surrounded by the water phase, which is divided into two compartments. First compartment is immobile and it is in contact with air phase, while the second compartment is mobile. This "mobile- immobile" formulation is a common approach for description of solute transport by groundwater. Mass transfer between two water compartments is modeled as a first order kinetic, where the mass transfer coefficient, representing diffusion and advection in the water phase towards the air channels, is parameter needed to be calibrated. Sorption for both water compartments is considered. The adopted model of contaminant evaporation at the air-water interface is verified by comparison with experimental results available from published sources. Model is used for simulation of two-dimensional air sparging laboratory experiment. Good overall agreement is observed. It is showed that the efficiency of air sparging can be influenced by natural groundwater flow.",
journal = "Water Science and Technology: Water Supply",
title = "A novel approach in numerical simulation of contaminant removal by air sparging",
pages = "170-163",
number = "3",
volume = "7",
doi = "10.2166/ws.2007.079"
}

Jaćimović, N., Hosoda, T., Ivetić, M.,& Kishida, K.. (2007). A novel approach in numerical simulation of contaminant removal by air sparging. in Water Science and Technology: Water Supply, 7(3), 163-170.
https://doi.org/10.2166/ws.2007.079

Jaćimović N, Hosoda T, Ivetić M, Kishida K. A novel approach in numerical simulation of contaminant removal by air sparging. in Water Science and Technology: Water Supply. 2007;7(3):163-170.
doi:10.2166/ws.2007.079 .

Jaćimović, Nenad, Hosoda, Takashi, Ivetić, Marko, Kishida, K., "A novel approach in numerical simulation of contaminant removal by air sparging" in Water Science and Technology: Water Supply, 7, no. 3 (2007):163-170,
https://doi.org/10.2166/ws.2007.079 . .