Abstr:UFR 2-13: Difference between revisions
Rapp.munchen (talk | contribs) |
Rapp.munchen (talk | contribs) |
||
Line 25: | Line 25: | ||
---- | ---- | ||
[[File:graphical_abstract.png|center|800px]|link=http://uriah.dedi.melbourne.co.uk/w/images/6/6e/Les_movie.avi]] [[Media:les_movie.avi|Download Movie]] | [[File:graphical_abstract.png|center|800px]|link=http://uriah.dedi.melbourne.co.uk/w/images/6/6e/Les_movie.avi]] [[Media:les_movie.avi|Download Movie]] | ||
Revision as of 16:34, 29 October 2013
Flows around bodies
Underlying Flow Regime 2-13
Abstract
The objective of the present contribution 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 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 .
Contributed by: G. De Nayer, A. Kalmbach, M. Breuer — Helmut-Schmidt Universität Hamburg (with support by S. Sicklinger and R. Wüchner from Technische Universität München)
© copyright ERCOFTAC 2024