Abstract
In this paper Large-eddy simulations (LES) of several flow problems are presented. First, the performance of two different solution schemes, both formulated for compressible flows, is compared for the case of a spatially developing plane turbulent jet. A second-order scheme based on an AUSM method with a central difference of the pressure derivatives and a compact finite difference scheme of sixth order are used with a dynamic model and also without any subgrid scale model. The boundary conditions correspond to a jet evolving into a fluid at rest; at the outflow plane non-reflecting conditions following Poinsot and Lele were used. Simulations were carried out for a Mach number of 0.1 and Reynolds number of 7600 and 22.000. The analysis of the flow field shows that both schemes produce results of comparable accuracy. The main reason why the higher-order scheme does not provide more accurate results than the second-order method, is probably the application of an explicit filter, which had to be used to remove high-frequency oscillations. The other flow problems presented are therefore simulated with the computationally less expensive second-order scheme. Results are presented for internal flows in straight and curved pipes, as well as a flow around a circular cylinder at a Reynolds number of 3900. Good agreement with reference data was found in all cases.
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Meinke, M., Rister, T., Rütten, F., Schvorak, A. (1999). Simulation of Internal and Free Turbulent Flows. In: Bungartz, HJ., Durst, F., Zenger, C. (eds) High Performance Scientific and Engineering Computing. Lecture Notes in Computational Science and Engineering, vol 8. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-60155-2_6
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DOI: https://doi.org/10.1007/978-3-642-60155-2_6
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