کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6380989 | 1625637 | 2014 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Extension of k-Ï turbulence closure to two-phase sediment transport modelling: Application to oscillatory sheet flows Extension of k-Ï turbulence closure to two-phase sediment transport modelling: Application to oscillatory sheet flows](/preview/png/6380989.png)
- Two-phase sediment transport model with k-Ï fluid turbulence closure is presented.
- Model is applied to wave-current and asymmetric wave sheet flows.
- k-Ï and k-ε closures produce similar results in two-phase sheet flow models.
- Closure for additional dissipative terms is critical.
A number of turbulence closure schemes can be employed to numerically investigate near-bed wave boundary layer and sediment transport problems. We present an extension of the widely used k-Ï turbulence model to two-phase sediment transport modelling. In this model, a transport equation is solved for the turbulence specific dissipation rate Ï. For two-phase models, this equation is similar to the one for clear fluids with an additional term due to inter-phase interaction terms, which we will discuss. The new k-Ï model is then applied to wave and current sheet flows. We compare the numerical results from the k-Ï model and from an existing k-ε model against sheet flow experimental data collected in oscillatory water tunnels. Both models provide broadly similar numerical results. Nevertheless, the k-Ï and k-ε models display different behaviour around flow reversal, and neither is able to fully reproduce observed suspension peak at flow reversal.
Journal: Advances in Water Resources - Volume 72, October 2014, Pages 110-121