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DIRECT NUMERICAL SIMULATION OF ROUGH WALL OPEN CHANNEL FLOW

Clemens Chan-Braun
Institute of Hydromechanics Karlsruhe Institute of Technology Kaiserstrasse 12, 76131 Karlsruhe

Manuel Garcia-Villalba
SFB 606, University of Karlsruhe, 76128 Karlsruhe, Germany; Bioingenieria e Ingenieria Aeroespacial Universidad Carlos III de Madrid Leganés 28911, Spain

Markus Uhlmann
Turbulent Flow Group, Institute for Hydromechanics, University of Karlsruhe, 76128 Karlsruhe, Germany

Аннотация

Direct numerical simulation of flow over one layer of spheres above a rigid wall has been carried out. Two cases are considered. In the first one the spheres are small and the flow is in the hydraulically smooth regime. In the second one, the spheres are approximately three times larger and the flow is in the transitionally rough regime. Various possible definitions of the normalisation parameters are discussed in detail. The instantaneous flow field and the flow statistics are briefly presented. The main focus of the study is on drag and lift acting on the particles, which are studied using 2D probability density functions and temporal correlations.