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Numerical simulation of turbulent channel flow with synthetic wall boundary conditions

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We use POD-based synthetic wall boundary conditions to mimic the flow at a height y+~50 within the wall region of a turbulent channel flow. Two different estimation methods (full reconstruction and phase reconstruction) are used to build a boundary condition from the knowledge of the instantaneous flow above that height. The numerical simulation is then carried out in a reduced domain, which excludes the wall region below that height. Turbulent statistics and one-point velocity spectra of the simulation are compared with those of a full domain. A slight overestimation of the small-scale content in the center of the channel is observed for the phase reconstruction method.

Author(s):

Berengere Podvin    
LIMSI-CNRS
France

Yann Fraigneau    
LIMSI-CNRS
France