Physics of Fluids, Год журнала: 2024, Номер 36(9)
Опубликована: Сен. 1, 2024
Meandering compound channels, which are the most common platform acquired by natural rivers, typically equipped with vegetated floodplains that exhibit complex hydraulic characteristics and sediment transport processes. Given studying depth-averaged streamwise velocity is foundation for determining flood discharge performance carrying capacity, this paper presents an analytical solution to forecast lateral distribution in meandering channels floodplains. The model, incorporates effects of bed friction, vegetation-induced drag force, transverse shear turbulence, secondary flows, derived from longitudinal depth-integrated Navier–Stokes equation continuity assuming current term additional Reynolds stress be laterally linear. proposed model then successfully applied curved different reported literature. satisfactory agreement between predicted experimental results validates effectiveness model. Thereafter, impact varying characteristic parameters on profile discussed analyzed applying validated Results indicate coefficients dimensionless eddy viscosity exert more pronounced influences than associated vegetation-triggered force. Furthermore, it found sizes signs contingent upon intensities rotational directions flow cells. presented can employed as alternative methodology gain insight into rivers
Язык: Английский
Процитировано
3Modeling of non-equilibrium suspended sediment transport process in open channel flows with vegetation
Physics of Fluids, Год журнала: 2024, Номер 36(11)
Опубликована: Ноя. 1, 2024
A mathematical model based on advection-diffusion theory is established to study the non-equilibrium sediment transport process in vegetated channels. The effects of vegetation velocity distribution and diffusion coefficients were considered, respectively. Validation against experimental data from flume studies confirms model's ability accurately predict longitudinal deposition rate vertical suspended concentration (SSC). comparative analysis three coefficient formulations indicates that linear-exponential formula provides a more precise estimate εsz, performs well predicting turbulent both rigid flexible when gently swaying. Moreover, distance required for SSC regain equilibrium influenced by submergence level canopy. At lower levels, canopy shear vortices significantly affect exchange sediment, exhibit pronounced stratification near An increase density at these levels intensifies vortices, thereby extending needed reach equilibrium. higher impact lessened, which reduces characteristics, flow similar rough boundary layer flow. increases resistance, shortens attain However, further efforts are explore characteristics with highly motion grain size non-uniform sediments flows.
Язык: Английский
Процитировано
2Evaluation of turbulence models for the prediction of flow properties in vegetated channels
Physics of Fluids, Год журнала: 2024, Номер 36(9)
Опубликована: Сен. 1, 2024
The performance of turbulence models was investigated to predict the flow and features vegetated channel using computational fluid dynamics (CFD). Ansys Fluent, CFD software implemented for numerical studies. three-dimensional, incompressible, steady, turbulent. Ten models, provided by were comparative study. model validated against an experimental study conducted in literature. studies show that Renormalization group k–ε is most successful predicting characteristics with a Root Mean Square Error (RMSE) value 0.2752. At same time, Reynolds Stress Model gives least predictive performance, indicated RMSE 0.4302. Moreover, Spalart–Allmaras (S–A) offers shortest computation time 6652.393 s, whereas Shear Transport k–ω proves be time-consuming 11 952.219 s. velocity water not uniform as it slower at surface leaves faster free zones. maximum observed middle section channel, below leaf, between roots u = 0.1158 m/s. Furthermore, are influenced several factors such geometry, velocity, vegetation distribution. As result, presence affects significantly.
Язык: Английский
Процитировано
0Numerical study of the effect of vegetation submerged ratio on turbulence characteristics in sediment-laden flow
Ocean Engineering, Год журнала: 2024, Номер 314, С. 119629 - 119629
Опубликована: Ноя. 6, 2024
Язык: Английский
Процитировано
0Flow and plants
Physics of Fluids, Год журнала: 2024, Номер 36(11)
Опубликована: Ноя. 1, 2024
Процитировано
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