| Large-eddy simulation of complex shear flows using an approximate deconvolution model (2005) | |||||||||
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| l ETH dissert ion submitted SWISS FEDER INSTITUTES TFC HNOLOGY ZijR ICR for the degree ctor Technical Sciences Steffen Stolz IXpl Ilq University Karlsruhe TIT born Janmry citizen Germany Prof Gernmno examiner Prof Poulilalms esarniner strac approxima deconvolution model ADM for rge eddy simulation LES incompressible and compressible lows complex geometries developed ADM based approximate deconvolution the filtered data truncatecl series espa nsion the inverse filter This approximation the unfiltjered used compute directly the nonlinear terms the filtered Navier Stokes equations thus the need compute explicit expressions for the unclosed subgrid correlations becomes obsolete relaxation term which sonly those that not accurately resolved used model the interaction the resolved with the non represented scales bcyoncl the numericaIl cut The relaxation term contains para meter hich can detcrminecl from the instantaneous filtered solution dynamic procedure LES have been performed for incompressible turbulent channel flow turbulent npersonic compression rnp flow shock turbulence intera ction compressi lole deca yin isotropic tIurbulcnce They all show very good agreement wit filtered direct nrnncrical simulation DNS data prior tests with ADM for compression ramp flop using well resolved DNS data show correlations well exceeding for all significant subgrid terms The computational cost XDM less that other models currently use such the dynamic models further aclvantage ADM for shockturb | |||||||||
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