Abstr:UFR 2-13

A fluid-structure interaction benchmark in turbulent flow (FSI-PfS-1a)

Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References

Abstract

You are first asked to provide a brief review of the state of the art for this UFR, i.e. published studies of the UFR which have included comparisons of measurements with CFD results. You should then focus upon a least one such study and describe it in some detail. Ideally, this study will have been conducted under good quality control and will have been comprehensively reported and included in an established database to which a link can be made.

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Contributed by: Michael Breuer — Helmut-Schmidt Universität Hamburg

Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References

 The objective of the present paper is to provide a challenging and
 well-defined benchmark for fluid-structure interaction (FSI) in
 turbulent flow to close a gap in the literature. The following list
 of requirements are taken into account during the definition and
 setup phase. First, the test case should be geometrically simple
 which is realized by a classical cylinder flow configuration
 extended by a flexible structure attached to the backside of the
 cylinder. Second, clearly defined operating and boundary conditions
 are a must and put into practice by a constant inflow velocity and
 channel walls. The latter are also evaluated against a periodic
 setup relying on a subset of the computational domain. Third, the
 material model should be widely used. Although a rubber plate is
 chosen as the flexible structure, it is demonstrated by additional
 structural tests that a classical St.\ Venant-Kirchhoff material
 model is sufficient to describe the material behavior
 appropriately. Fourth, the flow should be in the turbulent
 regime. Choosing water as the working fluid and a medium-size water
 channel, the resulting Reynolds number of \mbox{$\text{Re} =
   30,470$} guarantees a sub-critical cylinder flow with transition
 taking place in the separated shear layers. Fifth, the benchmark
 results should be underpinned by a detailed validation process. For
 this purpose complementary numerical and experimental investigations
 were carried out. Based on optical contactless measuring techniques
 (particle-image velocimetry and laser distance sensor) the
 phase-averaged flow field and the structural deformations were
 determined. These data were compared with corresponding numerical
 predictions relying on large-eddy simulations and a recently
 developed semi-implicit predictor-corrector FSI coupling
 scheme. Both results were found to be in close agreement showing a
 quasi-periodic oscillating flexible structure in the first swiveling
 FSI mode with a corresponding Strouhal number of about
 \mbox{$\text{St} = 0.11$}.

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