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

Flows Around Bodies

Underlying Flow Regime 2-14

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 and the same numerical methodology is applied and will thus only partially repeated here for the sake of brevity (However, all details are available at UFR 2-13).

Applications of so-called fluid-structure interactions (FSI) are widespread. To improve coupled numerical FSI simulations, generic experimental benchmark studies of the fluid and the structure are necessary. 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 with a planar particle image velocimetry (PIV) and a volumetric three-component velocimetry (V3V) system. To determine the structure displacements a multiple-point laser triangulation sensor is used. 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.