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EXPERIMENTAL INVESTIGATIONS ON THE TURBULENT FLOW OVER A PERIODIC HILL GEOMETRY

Christoph Rapp
Fachgebiet Hydromechanik, Technische Universitäat Müunchen Arcisstr. 21, D-80333 Munchen, Germany

Michael Manhart
Fachgebiet Hydromechanik, Technische Universitat München, Arcisstrasse 21, 80333 München, Germany

Abstrakt

In this paper experimental data of the flow over a periodic arrangement of hills in a channel are presented for three different Reynolds numbers. This investigation serves at providing reference data for this flow case that has been used by several initiatives as a benchmark test case for numerical methods. The case has all features of separating and reattaching flows at affordable computational costs, because it is designed to be periodic in streamwise and homogeneous in spanwise direction. The flow was monitored in terms of periodicity and homogeneity with high resolution pressure cells and PIV measurements at a low Reynolds number. The mean velocity components and the Reynolds stresses are checked in terms of adequacy of the experiment in comparison to highly resolved LES and DNS data. An outlook discussing Reynolds number effects summarises the results.