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Blended scale-separation models for large eddy simulations

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At the crossroads of theory and simulation new dissipation and regularization models for large eddy simulation (LES) start to develop. The basic idea is that the LES-solution should contain only scales of size >= d
, where d is a user-chosen length scale. In case the convective nonlinearity produces scales <
d (forward scatter) we compute an eddy viscosity such that the resulting eddy diffusion (counter)balance the production term approximately. In case of backscatter, the scale seperation condition is satisfied by regularizing the nonlinear production. The resulting blend of dissipation and regularization is successfully tested for turbulent channel flow (Re=590).

Author(s):

Roel Verstappen    
University of Groningen
Netherlands