Large eddy simulation of turbulent open-channel flow with free surface simulated by level set method

摘要: Turbulent open-channel flow over a two-dimensional laboratory-scale dune is studied using large eddy simulation. Free-surface motion simulated level set method. Two subgrid scale models, namely, dynamic Smagorinsky and two-parameter are employed to assess model effects on the free surface. It found that two models have very similar performance in predicting free-surface turbulence. depths investigate of water depth coherent structures turbulence statistics. In deep-water flow, experimental data used for numerical predictions mean field They be good agreement. shallow-water there strong interaction between large-scale vortical emanating from bed, increasing intensity disturbance. The simulations predict streaky wall layer after reattachment but not case, suggesting surface significantly affected by depth.