Abstr:UFR 2-14

Fluid-structure interaction in turbulent flow past cylinder/plate configuration II

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Abstract

• You are looking for an interesting test case for fluid-structure interaction in turbulent flow?

• You already had a look at the test case UFR 2-13 and think that this case is not challenging enough?

Then the following description might be of interest for you!

The objective of the present contribution is provide a second well-defined benchmark case for fluid-structure interaction as a growing branch of research in science and industry. Similar to the previous case UFR 2-13 the entire study relies on a complementary experimental and numerical investigation. The same measuring techniques (planar particle image velocimetry (PIV), volumetric three-component velocimetry (V3V),multiple-point laser triangulation sensor) and the same numerical methodology (partitioned FSI coupling scheme based on large-eddy simulation) is applied and will thus only partially repeated here for the sake of brevity (However, all details are available at UFR 2-13).

• What are the differences between the previous case and the present one?

For the previous configuration (FSI-PfS-1a) the flexible structure deforms in the first swiveling mode inducing only moderate structural displacements by an instability-induced excitation. On the contrary, the new case denoted FSI-PfS-2a is a movement-induced excitation with significantly larger deformations of the flexible structure in the second swiveling mode.

In this work, the coupling of a vortex-induced periodic deformation of a flexible structure mounted behind a rigid cylinder and a fully turbulent water flow performed at a Reynolds number of Re = 30,470 is experimentally investigated. The three-dimensional fluid velocity results show shedding vortices behind the structure, which reaches the second swiveling mode with a frequency of about 11.2 Hz corresponding to a Strouhal number of St = 0.177. Providing phase-averaged flow and structure measurements precise experimental data for coupled computational fluid dynamics (CFD) and computational structure dynamics (CSD) validations are available for this new benchmark case denoted FSI-PfS-2a. The test case possesses four main advantages:

• (i) The geometry is rather simple;
• (ii) Kinematically, the rotation of the front cylinder is avoided;
• (iii) The boundary conditions are well defined;
• (iv) Nevertheless, the resulting flow features and structure displacements are challenging from the computational point of view.

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Contributed by: Andreas Kalmbach, Guillaume De Nayer, Michael Breuer — Helmut-Schmidt Universität Hamburg

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