Numerical modelling of turbulent flow over rough walls |
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| Authors: | Petr Louda Jaromír P?íhoda Karel Kozel |
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| Institution: | 1. Faculty of Mechanical Engineering, Czech Technical University in Prague, Czech Republic;2. Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic |
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| Abstract: | The numerical simulation of turbulent flow over rough walls was carried out for various types of roughness. The mathematical model was based on the Reynolds averaged Navier-Stokes equations for incompressible flow. The two-equation SST and oneequation Spalart-Allmaras turbulence models were used. Boundary conditions on rough walls were prescribed directly on the wall using the SST model modified to account for wall roughness by Hellsten and Laine (1997) and the SA model modified by Aupoix and Spalart (2003). Turbulence models were tested for the constant pressure turbulent boundary layer on the rough wall formed by commercial abrasive paper and by tightly packed spheres. The effect of wall roughness on the decelerated flow over a smoothly contoured ramp with flow separation was investigated. Obtained results were compared with experimental data. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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