Semi-Confined Flows

Underlying Flow Regime 3-34

Best Practice Advice

Key Physics

Key physical features of the UFR in question are: separation of the turbulent boundary layer from a smooth surface driven by adverse pressure gradient, a rapid development of three-dimensional turbulent structures in the separated shear layer, its reattachment to the plane wall, and further relaxation of the reattached turbulent boundary layer to the “normal” state.

Physical Modelling Issues

Turbulence Modelling

Based on the conclusions formulated above the following advice for the computations of the considered UFR may be given.

Use turbulence-resolving approaches (hybrid RANS-LES or global WMLES and WRLES), since none of currently available RANS turbulence model, either linear eddy-viscosity or RSM, ensures capturing of the challenging physical features of the UFR indicated above. However a success of the scale-resolving approaches is also not guaranteed. In order to reach it:

Contributed by: E. Guseva, M. Strelets — Peter the Great St. Petersburg Polytechnic University (SPbPU)