Abstr:UFR 2-14
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
(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 large 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.
Contributed by: Andreas Kalmbach, Guillaume De Nayer, Michael Breuer — Helmut-Schmidt Universität Hamburg
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