Summary
The present paper summarizes results from a numerical study conducted in order to clarify the requirements for the large-eddy simulation of near-wall turbulence. A key finding of the study is that an inverse cascade of turbulent kinetic energy from small to large scales exists within the buffer layer which cannot be accounted for by currently applied subgrid models. This may lead to significant errors in large-eddy simulations when the wall layer is resolved. Therefore a new model for the eddy viscosity is proposed which is more consistent with the near-wall physics than are the models commonly employed. A priori tests of this new model show promising results. The present investigation is primarily based on direct numerical simulation data of turbulent channel flow at various low Reynolds numbers. However, no significant Reynolds-number effects were observed which suggests that the findings may essentially be generalized to flows at higher Reynolds numbers.
Work performed while the authors were affiliated with DLR Göttingen
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© 1996 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig/Wiesbaden
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Härtel, C., Kleiser, L. (1996). Large-Eddy Simulation of Near-Wall Turbulence. In: Hirschel, E.H. (eds) Flow Simulation with High-Performance Computers II. Notes on Numerical Fluid Mechanics (NNFM), vol 48. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-89849-4_18
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DOI: https://doi.org/10.1007/978-3-322-89849-4_18
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