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DY: Fachverband Dynamik und Statistische Physik

DY 34: Fluid Dynamics and Turbulence II

DY 34.8: Talk

Thursday, March 17, 2011, 16:00–16:15, ZEU 255

Generation of homogeneous shear turbulence by using an active grid — •Erwin Renken, Pascal Knebel, and Michael Hölling — Carl von Ossietzky Universität Oldenburg

We generate a shear turbulence by using an active grid in a wind tunnel. This shear turbulence is homogeneous, so it has a constant gradient of the mean velocity. The active grid consist of rods with small flaps, where some rods are in horizontal and some in vertical direction. Each rod is connected to a step motor, and can rotate in a specified way. We are using a protocol which describe the time-dependent angle of each axis. We use the horizontal axis primary for a default blockage diterming the gradient, and the vertical to generate homogeneous turbulence by moving the flaps. With this approach we aim to remodel specific properties of the atmospheric layer.