Abstract
This paper presents a method for a synthetic turbulence generation (STG) to be used in a segregated hybrid Reynolds-averaged Navier-Stokes (RANS)-Large-Eddy Simulation (LES) approach. The present method separates the LES inflow plane into three sections where a local velocity signal is decomposed from the turbulent flow properties of the upstream RANS solution. Depending on the wall-normal position in the boundary layer, the local flow Reynolds and Mach number specific time, length and velocity scales with different vorticity contents are imposed on the LES inflow plane. The STG method is assessed by comparing the resulting skin-friction, velocity and Reynolds-stress distributions of zonal RANS-LES simulations of flat plate boundary layers with available pure LES, DNS, and experimental data. It is shown that for the presented flow cases a satisfying agreement within a short RANS-to-LES transition of two boundary-layer thicknesses is obtained. The method is further used for the simulation of a shock-boundary-layer interaction around an airfoil at transonic flow conditions, where the separated flow region are analyzed by an embedded LES and the remaining flow is determined by a RANS solution.
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Issakhov, A., Roidl, B., Meinke, M., Schröder, W. (2015). Simulation of Transonic Airfoil Flow Using a Zonal RANS-LES Method. In: Danaev, N., Shokin, Y., Darkhan, AZ. (eds) Mathematical Modeling of Technological Processes. CITech 2015. Communications in Computer and Information Science, vol 549. Springer, Cham. https://doi.org/10.1007/978-3-319-25058-8_6
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DOI: https://doi.org/10.1007/978-3-319-25058-8_6
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