A Large-Eddy Simulation of Vortex Cell flow with Incoming Turbulent Boundary Layer

We present a Large-Eddy simulation of a vortex cell with circular shaped. The results show that the flow field can be sub divided into four important zones, the shear layer above the cavity, the stagnation zone, the vortex core in the cavity and the boundary layer along the wall of the cavity. It is shown that the vortex core consits of solid body rotation without much turbulence activity. The vortex is mainly driven by high energy packets that are driven into the cavity from the stagnation point region and by entrainment of fluid from the cavity into the shear layer. The physics in the boundary layer along the cavity-s wall seems to be far from that of a canonical boundary layer which might be a crucial point for modelling this flow.

Authors:

• Arpiruk Hokpunna
• Michael Manhart

Keywords:

• Turbulent flow
• Large eddy simulations
• boundary layer and cavity flow
• vortex cell flow.

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