Fluid-structure interaction in turbulent flows: LES predictions and PIV measurements

Abstract

This contribution presents a complementary numerical/experimental investigation on a new fluid-structure interaction (FSI) test case denoted FSI-PfS-1. In comparison to previously suggested FSI benchmark cases (see Gomes and Lienhart (2006, 2010)) the present configuration is less challenging from the computational point of view. The reasons are versatile: Owing to a fixed cylindrical front body the mechanical system has less degrees of freedom. Furthermore, the swiveling structure is consisting of a unique material without an additional rear weight. Finally, the thickness of the flexible structure is 50 times larger than the very thin structure used in previous investigations. The structural model was installed in a water tunnel and operated in the subcritical turbulent regime at a Reynolds number of Re = 3 104. Based on optical measuring techniques the phase-averaged flow field as well as the deformation of the structure were experimentally determined. Additionally, the FSI test case was predicted by a partitioned semi-implicit predictor-corrector coupling scheme applying the large-eddy simulation technique. The contribution presents a first comparison concerning the phase-resolved flow field and the structure deformation. The swiveling motion of the flexible structure found in the experiment is predicted in reasonable agreement. Finally, an outlook is given about all issues of the benchmark case which need further evaluations and improvements.