On the application of the double-averaging methodology in modelling vegetated open-channel flows
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Приказ свих података о документуАпстракт
The double-averaging methodology (DAM) arose to respond to a need to provide
a mathematically rigorous tool for describing spatially heterogeneous turbulent
flows. Initial developments originate from micrometeorologists who revealed
notable discrepancies between measured and simulated temperature and
moisture fields above trees when using only Reynolds-averaged Navier-Stokes
(RANS) equations with various turbulence model closures. The discrepancies were
attributed to the spatial inhomogeneity of the flow field caused by vegetation.
Thus, additional spatial averaging of RANS equations over horizontal planes
sufficiently large to provide statistical averaging of all differences caused by an
arbitrary distribution of plants and the influence of the biggest vortices responsible
for the transfer of momentum was suggested. The advantages of using the DAM
in open-channel hydraulics of gravel-bed rivers were recognised in the early 2000s
when DAM was first applied and c...onsequently improved. Open-channel vegetated
flows are another example of spatially heterogene¬ous turbulent flows to which
the DAM can be applied. The paper presents the results of the DoubleVeg project
led by the author, in which a new set of equations was derived. After introducing
the basic DAM concepts, the procedure of deriving Depth-Integrated Double
Averaged Navier-Stokes equations is presented. Consequently, the main
challenges in solving these equations are discussed, and the results of initial testing
of systems of homogeneous and non-homogeneous equations are shown.
Кључне речи:
spatially heterogeneous flows - prostorno heterogena strujanja / representative averaging volume - statistički reprezentativna zapremina osrednjavanja / porosity - poroznost / double averaging - dvostruko osrednjavanje / DIDANS equations - DIDANS jednačine / adapted Roe’s method - prilagođen Rouov postupakИзвор:
Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering, 2024, 29-63Издавач:
- University of Novi Sad, Faculty of Civil Engineering Subotica Kozaračka 2а, 24000 Subotica, Serbia URL: conference.gf.uns.ac.rs
Финансирање / пројекти:
- DoubleVeg - Application of Double-Averaging Methodology to Modelling of Flow in Compound Channels with Vegetation on Floodplains (RS-ScienceFundRS-Dijaspora-6466895)
Напомена:
- Ово је предавање по позиву на 9. међународној конференцији "Савремена достигнућа у грађевинарству 2024" одржаној 25-26. априла 2024. године у Суботици.
Колекције
Институција/група
GraFarTY - GEN AU - Đorđević, Dejana PY - 2024 UR - https://grafar.grf.bg.ac.rs/handle/123456789/3506 AB - The double-averaging methodology (DAM) arose to respond to a need to provide a mathematically rigorous tool for describing spatially heterogeneous turbulent flows. Initial developments originate from micrometeorologists who revealed notable discrepancies between measured and simulated temperature and moisture fields above trees when using only Reynolds-averaged Navier-Stokes (RANS) equations with various turbulence model closures. The discrepancies were attributed to the spatial inhomogeneity of the flow field caused by vegetation. Thus, additional spatial averaging of RANS equations over horizontal planes sufficiently large to provide statistical averaging of all differences caused by an arbitrary distribution of plants and the influence of the biggest vortices responsible for the transfer of momentum was suggested. The advantages of using the DAM in open-channel hydraulics of gravel-bed rivers were recognised in the early 2000s when DAM was first applied and consequently improved. Open-channel vegetated flows are another example of spatially heterogene¬ous turbulent flows to which the DAM can be applied. The paper presents the results of the DoubleVeg project led by the author, in which a new set of equations was derived. After introducing the basic DAM concepts, the procedure of deriving Depth-Integrated Double Averaged Navier-Stokes equations is presented. Consequently, the main challenges in solving these equations are discussed, and the results of initial testing of systems of homogeneous and non-homogeneous equations are shown. PB - University of Novi Sad, Faculty of Civil Engineering Subotica Kozaračka 2а, 24000 Subotica, Serbia URL: conference.gf.uns.ac.rs T2 - Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering T1 - On the application of the double-averaging methodology in modelling vegetated open-channel flows EP - 63 SP - 29 DO - 10.14415/CACE2024.03 ER -
@misc{ author = "Đorđević, Dejana", year = "2024", abstract = "The double-averaging methodology (DAM) arose to respond to a need to provide a mathematically rigorous tool for describing spatially heterogeneous turbulent flows. Initial developments originate from micrometeorologists who revealed notable discrepancies between measured and simulated temperature and moisture fields above trees when using only Reynolds-averaged Navier-Stokes (RANS) equations with various turbulence model closures. The discrepancies were attributed to the spatial inhomogeneity of the flow field caused by vegetation. Thus, additional spatial averaging of RANS equations over horizontal planes sufficiently large to provide statistical averaging of all differences caused by an arbitrary distribution of plants and the influence of the biggest vortices responsible for the transfer of momentum was suggested. The advantages of using the DAM in open-channel hydraulics of gravel-bed rivers were recognised in the early 2000s when DAM was first applied and consequently improved. Open-channel vegetated flows are another example of spatially heterogene¬ous turbulent flows to which the DAM can be applied. The paper presents the results of the DoubleVeg project led by the author, in which a new set of equations was derived. After introducing the basic DAM concepts, the procedure of deriving Depth-Integrated Double Averaged Navier-Stokes equations is presented. Consequently, the main challenges in solving these equations are discussed, and the results of initial testing of systems of homogeneous and non-homogeneous equations are shown.", publisher = "University of Novi Sad, Faculty of Civil Engineering Subotica Kozaračka 2а, 24000 Subotica, Serbia URL: conference.gf.uns.ac.rs", journal = "Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering", title = "On the application of the double-averaging methodology in modelling vegetated open-channel flows", pages = "63-29", doi = "10.14415/CACE2024.03" }
Đorđević, D.. (2024). On the application of the double-averaging methodology in modelling vegetated open-channel flows. in Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering University of Novi Sad, Faculty of Civil Engineering Subotica Kozaračka 2а, 24000 Subotica, Serbia URL: conference.gf.uns.ac.rs., 29-63. https://doi.org/10.14415/CACE2024.03
Đorđević D. On the application of the double-averaging methodology in modelling vegetated open-channel flows. in Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering. 2024;:29-63. doi:10.14415/CACE2024.03 .
Đorđević, Dejana, "On the application of the double-averaging methodology in modelling vegetated open-channel flows" in Conference Proceedings of the IX International Conference on Contemporary Achievments in Civil Engineering (2024):29-63, https://doi.org/10.14415/CACE2024.03 . .