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Behavior determination of rigid vegetation effect on flow dynamics in open channels using CFD technology

Yıl 2025, Cilt: 6 Sayı: 1, 34 - 41, 29.06.2025

Mahmut Aydoğdu

https://doi.org/10.46572/naturengs.1682946

Öz

In recent years, computational fluid dynamics software has significantly contributed to the literature on flow characteristics and turbulent solutions in open channel flows. In this study, two vegetation patch arrangements underwent numerical simulation using the Reynolds Stress Model in Ansys-Fluent software. The flow dynamics of the two cases were compared, and the responses of vegetation patches under subcritical flow conditions were investigated. First, the model was validated and then utilized for numerical simulation. It was observed that more effective velocity reduction occurred in the vegetation patch region and immediately downstream of the patches. While the vegetation patch in Case-1
reduced the flow velocity by 57% compared to the flow velocity at the channel entrance, it remained at 52% for Case-2. The depth-averaged vertical velocity distribution at points P1 and P2 showed lower values downstream for Case-2. Regarding the effect in the downstream region, the turbulence area in Case-2 was narrower compared to Case-1, with turbulent kinetic energy values greater than 0 observed in the channel center. While the energy dissipation percentage was 30% for Case-1, approximately 43% was achieved in Case-2. These results strongly support the feasibility reports with visuals and big data opportunities of CFD sampling before field applications.

Anahtar Kelimeler

CFD rigid vegetation patch open-channel energy dissipation turbulent kinetic energy

Etik Beyan

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Destekleyen Kurum

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Proje Numarası

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Teşekkür

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Kaynakça

  • Fonseca, M. S., & Kenworthy, W. J. (1987). Effects of current on photosynthesis and distribution of seagrasses. Aquatic botany, 27(1), 59-78.
  • Nepf, H. M. (2012). Flow and transport in regions with aquatic vegetation. Annual review of fluid mechanics, 44(1), 123-142.
  • Altun, Ö. (2007). Bitki örtüsü içeren bileşik kesitli kanallarda kapasite tayini yaklaşımlarının model deneylerine göre irdelenmesi (Doctoral dissertation, Yüksek Lisans Tezi, Gazi Üniversitesi Fen Bilimleri Enstitüsü, Ankara).
  • Bai, Y., Han, L., Zhao, Y., Huang, L., Wang, Q., & Sun, G. (2024). Numerical simulation of velocity distribution and pollution transport in a two-stage channel with vegetation on a floodplain. Journal of Hydrology, 630, 130788.
  • Asif, M., Ghani, U., Pasha, G. A., Ullah, M. K., & Ali, S. (2024). 3D numerical investigation of flow behavior in an open channel with uniform and layered vegetation patches under varying submergence conditions. Ain Shams Engineering Journal, 15(1), 102288.
  • Pasha, G. A., & Tanaka, N. (2017). Undular hydraulic jump formation and energy loss in a flow through emergent vegetation of varying thickness and density. Ocean Engineering, 141, 308-325.
  • Nikora, N., Nikora, V., & O’Donoghue, T. (2013). Velocity profiles in vegetated open-channel flows: combined effects of multiple mechanisms. Journal of Hydraulic Engineering, 139(10), 1021-1032.
  • Belcher, S. E., Jerram, N., & Hunt, J. C. R. (2003). Adjustment of a turbulent boundary layer to a canopy of roughness elements. Journal of Fluid Mechanics, 488, 369-398.
  • Luhar, M., Rominger, J., & Nepf, H. (2008). Interaction between flow, transport and vegetation spatial structure. Environmental Fluid Mechanics, 8, 423-439.
  • Rominger, J. T., & Nepf, H. M. (2011). Flow adjustment and interior flow associated with a rectangular porous obstruction. Journal of Fluid Mechanics, 680, 636-659.
  • Sukhodolov, A. N., & Sukhodolova, T. A. (2012). Vegetated mixing layer around a finite‐size patch of submerged plants: Part 2. Turbulence statistics and structures. Water Resources Research, 48(12).
  • Aydogdu, M. (2023). Analysis of the effect of rigid vegetation patches on the hydraulics of an open channel flow with Realizable k-ε and Reynolds stress turbulence models. Flow Measurement and Instrumentation, 94, 102477.
  • Wang, C., Zheng, S. S., Wang, P. F., & Hou, J. (2015). Interactions between vegetation, water flow and sediment transport: A review. Journal of Hydrodynamics, 27(1), 24-37.
  • Sabokrouhiyeh, N., Bottacin-Busolin, A., Nepf, H., & Marion, A. (2016). Effects of vegetation density and wetland aspect ratio variation on hydraulic efficiency of wetlands. Hydrodynamic and Mass Transport at Freshwater Aquatic Interfaces: 34th International School of Hydraulics, 101-113.
  • Yılmazer, D., Ayna, G., Ozan, A. Y., & Cihan, K. (2022). Tam batmış bitki tarlasının açık kanal akım hızlarına etkisinin flow-3d ile modellenmesi. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 24(2), 757-769.
  • Yılmazer, D., Ozan, A. Y., & Cihan, K. (2018). Flow characteristics in the wake region of a finite-length vegetation patch in a partly vegetated channel. Water, 10(4), 459.
  • Cui, J., & Neary, V. S. (2008). LES study of turbulent flows with submerged vegetation. Journal of Hydraulic Research, 46(3), 307-316.
  • Anjum, N., & Tanaka, N. (2019). Numerical investigation of velocity distribution of turbulent flow through vertically double-layered vegetation. Water Science and Engineering, 12(4), 319-329.
  • Ghani, U., Anjum, N., Pasha, G. A., & Ahmad, M. (2019). Numerical investigation of the flow characteristics through discontinuous and layered vegetation patches of finite width in an open channel. Environmental Fluid Mechanics, 19(6), 1469-1495.
  • Dissanayaka, K. D., & Tanaka, N. (2023). Comparison of the flow around circular and rectangular emergent cylinders with subcritical and supercritical conditions. Fluids, 8(4), 124.
  • Ashraf, J., Anjum, N., Rahman, M. A., Ghani, U., & Ahmed, Z. (2024). Investigating the flow structure around floating vegetation islands in an open channel. Innovative Infrastructure Solutions, 9(5), 159.
  • Ansys, I. (2019). ANSYS Fluent User’s Guide, Version 2019 R3. ANSYS Inc., Canonsburgh, PA, USA.
  • Anjum, N., Pasha, G. A., Ashraf, J., Ghani, U., Abbas, F. M., & Rahman, M. A. (2025). How emergent vegetation patch shapes affect flow structure in open channel environments. Ecohydrology, 18(2), e2740.
  • Li, D., Liu, M., & Huai, W. (2022). Modeling transverse momentum exchange in partially vegetated flow. Physics of Fluids, 34(2).
  • Hirt, C. W., & Nichols, B. D. (1981). Volume of fluid (VOF) method for the dynamics of free boundaries. Journal of Computational Physics, 39(1), 201-225.
  • Jiang, H., Zhao, B., Dapeng, Z., & Zhu, K. (2023). Numerical simulation of two-dimensional dam failure and free-side deformation flow studies. Water, 15(8), 1515.
  • Craft, T. J., Launder, B. E., & Suga, K. (1996). Development and application of a cubic eddy-viscosity model of turbulence. International Journal of Heat and Fluid Flow, 17(2), 108-115.
  • Chen, S. C., Kuo, Y. M., & Li, Y. H. (2011). Flow characteristics within different configurations of submerged flexible vegetation. Journal of Hydrology, 398(1-2), 124-134.

Yıl 2025, Cilt: 6 Sayı: 1, 34 - 41, 29.06.2025

Mahmut Aydoğdu

https://doi.org/10.46572/naturengs.1682946

Öz

Proje Numarası

-

Kaynakça

  • Fonseca, M. S., & Kenworthy, W. J. (1987). Effects of current on photosynthesis and distribution of seagrasses. Aquatic botany, 27(1), 59-78.
  • Nepf, H. M. (2012). Flow and transport in regions with aquatic vegetation. Annual review of fluid mechanics, 44(1), 123-142.
  • Altun, Ö. (2007). Bitki örtüsü içeren bileşik kesitli kanallarda kapasite tayini yaklaşımlarının model deneylerine göre irdelenmesi (Doctoral dissertation, Yüksek Lisans Tezi, Gazi Üniversitesi Fen Bilimleri Enstitüsü, Ankara).
  • Bai, Y., Han, L., Zhao, Y., Huang, L., Wang, Q., & Sun, G. (2024). Numerical simulation of velocity distribution and pollution transport in a two-stage channel with vegetation on a floodplain. Journal of Hydrology, 630, 130788.
  • Asif, M., Ghani, U., Pasha, G. A., Ullah, M. K., & Ali, S. (2024). 3D numerical investigation of flow behavior in an open channel with uniform and layered vegetation patches under varying submergence conditions. Ain Shams Engineering Journal, 15(1), 102288.
  • Pasha, G. A., & Tanaka, N. (2017). Undular hydraulic jump formation and energy loss in a flow through emergent vegetation of varying thickness and density. Ocean Engineering, 141, 308-325.
  • Nikora, N., Nikora, V., & O’Donoghue, T. (2013). Velocity profiles in vegetated open-channel flows: combined effects of multiple mechanisms. Journal of Hydraulic Engineering, 139(10), 1021-1032.
  • Belcher, S. E., Jerram, N., & Hunt, J. C. R. (2003). Adjustment of a turbulent boundary layer to a canopy of roughness elements. Journal of Fluid Mechanics, 488, 369-398.
  • Luhar, M., Rominger, J., & Nepf, H. (2008). Interaction between flow, transport and vegetation spatial structure. Environmental Fluid Mechanics, 8, 423-439.
  • Rominger, J. T., & Nepf, H. M. (2011). Flow adjustment and interior flow associated with a rectangular porous obstruction. Journal of Fluid Mechanics, 680, 636-659.
  • Sukhodolov, A. N., & Sukhodolova, T. A. (2012). Vegetated mixing layer around a finite‐size patch of submerged plants: Part 2. Turbulence statistics and structures. Water Resources Research, 48(12).
  • Aydogdu, M. (2023). Analysis of the effect of rigid vegetation patches on the hydraulics of an open channel flow with Realizable k-ε and Reynolds stress turbulence models. Flow Measurement and Instrumentation, 94, 102477.
  • Wang, C., Zheng, S. S., Wang, P. F., & Hou, J. (2015). Interactions between vegetation, water flow and sediment transport: A review. Journal of Hydrodynamics, 27(1), 24-37.
  • Sabokrouhiyeh, N., Bottacin-Busolin, A., Nepf, H., & Marion, A. (2016). Effects of vegetation density and wetland aspect ratio variation on hydraulic efficiency of wetlands. Hydrodynamic and Mass Transport at Freshwater Aquatic Interfaces: 34th International School of Hydraulics, 101-113.
  • Yılmazer, D., Ayna, G., Ozan, A. Y., & Cihan, K. (2022). Tam batmış bitki tarlasının açık kanal akım hızlarına etkisinin flow-3d ile modellenmesi. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 24(2), 757-769.
  • Yılmazer, D., Ozan, A. Y., & Cihan, K. (2018). Flow characteristics in the wake region of a finite-length vegetation patch in a partly vegetated channel. Water, 10(4), 459.
  • Cui, J., & Neary, V. S. (2008). LES study of turbulent flows with submerged vegetation. Journal of Hydraulic Research, 46(3), 307-316.
  • Anjum, N., & Tanaka, N. (2019). Numerical investigation of velocity distribution of turbulent flow through vertically double-layered vegetation. Water Science and Engineering, 12(4), 319-329.
  • Ghani, U., Anjum, N., Pasha, G. A., & Ahmad, M. (2019). Numerical investigation of the flow characteristics through discontinuous and layered vegetation patches of finite width in an open channel. Environmental Fluid Mechanics, 19(6), 1469-1495.
  • Dissanayaka, K. D., & Tanaka, N. (2023). Comparison of the flow around circular and rectangular emergent cylinders with subcritical and supercritical conditions. Fluids, 8(4), 124.
  • Ashraf, J., Anjum, N., Rahman, M. A., Ghani, U., & Ahmed, Z. (2024). Investigating the flow structure around floating vegetation islands in an open channel. Innovative Infrastructure Solutions, 9(5), 159.
  • Ansys, I. (2019). ANSYS Fluent User’s Guide, Version 2019 R3. ANSYS Inc., Canonsburgh, PA, USA.
  • Anjum, N., Pasha, G. A., Ashraf, J., Ghani, U., Abbas, F. M., & Rahman, M. A. (2025). How emergent vegetation patch shapes affect flow structure in open channel environments. Ecohydrology, 18(2), e2740.
  • Li, D., Liu, M., & Huai, W. (2022). Modeling transverse momentum exchange in partially vegetated flow. Physics of Fluids, 34(2).
  • Hirt, C. W., & Nichols, B. D. (1981). Volume of fluid (VOF) method for the dynamics of free boundaries. Journal of Computational Physics, 39(1), 201-225.
  • Jiang, H., Zhao, B., Dapeng, Z., & Zhu, K. (2023). Numerical simulation of two-dimensional dam failure and free-side deformation flow studies. Water, 15(8), 1515.
  • Craft, T. J., Launder, B. E., & Suga, K. (1996). Development and application of a cubic eddy-viscosity model of turbulence. International Journal of Heat and Fluid Flow, 17(2), 108-115.
  • Chen, S. C., Kuo, Y. M., & Li, Y. H. (2011). Flow characteristics within different configurations of submerged flexible vegetation. Journal of Hydrology, 398(1-2), 124-134.
Toplam 28 adet kaynakça vardır.

Ayrıntılar

Birincil Dil İngilizce
Konular İnşaat Mühendisliğinde Sayısal Modelleme
Bölüm Research Articles
Yazarlar

Mahmut Aydoğdu 0000-0002-7339-2442

Proje Numarası -
Erken Görünüm Tarihi 29 Haziran 2025
Yayımlanma Tarihi 29 Haziran 2025
Gönderilme Tarihi 24 Nisan 2025
Kabul Tarihi 21 Haziran 2025
Yayımlandığı Sayı Yıl 2025 Cilt: 6 Sayı: 1

Kaynak Göster

APA Aydoğdu, M. (2025). Behavior determination of rigid vegetation effect on flow dynamics in open channels using CFD technology. NATURENGS, 6(1), 34-41. https://doi.org/10.46572/naturengs.1682946
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