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Bridging between coarse and fine resolution in variable resolution turbulence computations

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1210
pages 1171-1177

Stefan Wallin
Linne FLOW Center, Department of Mechanics Royal institute of technology Osquars Backe 18, Stockholm, Sweden

D. A. Reyes
Aerospace Engineering Department, Texas A&M University, College Station, Texas 77843-3141, USA

Sharath S. Girimaji
Department of Aerospace Engineering, Texas A&M University, College Station, Texas, USA; Department of Ocean Engineering, Texas A&M University, College Station, Texas, USA

Sinopsis

Variable-resolution (VR) bridging turbulence calculations in the context of partially-averaged Navier-Stokes (PANS) approach have been conducted by adopting explicit terms for the energy transfer between the resolved and unresolved scales when the resolution is varying in time. The method is tested for decaying isotropic turbulence flow. It is demonstrated that the energy transfer terms dissipates the correct amount of resolved turbulence kinetic energy for decreasing resolution and is also able to produce the necessary resolved turbulence in the case of increasing resolution while conserving the total amount of turbulence energy. Time-developing mixing layer simulations are ongoing. Preliminary results show that the mixing growth rate is reasonably preserved for different rate of resolution, but that the response to variable resolution is somewhat too strong.

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