LES with acoustics and PSI for deforming plates in gas flow

Summary, in English

This concerns Flow Induced Vibrations (Fly) in nuclear reactors and numerical analysis of such. Special attention is paid to structural excitation by sound generated remotely and turbulent flow around the structure. One hypothesis was that these phenomena can interact, so that the structure accumulates more energy from the flow if it also excited by sound from another source. In the studies, Fluid Structure Interaction (PSI) is simulated with Large Eddy Simulations (LESs). It is shown possible to simulate excitation due to both acoustic and turbulence loads using the reported methods, at least qualitatively. The excitation levels are even of the right order of magnitude in some parts. However, there are some shortcomings in the modeling. The most important is perhaps the lack of non-reflecting boundary conditions. Another problem is the strong numerical damping in combination with demanding numerics for the selected solid solution methodology. Three cases are simulated, two for validation and one applied about steam dryers. For the applied case, it is concluded unlikely that excitation by the acoustic and turbulence loads can interact. The main reason is that the flow is controlled more by static geometrical factors, such as solid rotation sharp edges, than small deformations due to vibrations. (C) 2012 Published by Elsevier B.V.

• Author: Per Nilsson; Eric Lillberg; Niklas Wikstrom
• Department/s: European Spallation Source ESS AB
• Publishing year: 2012
• Language: English
• Pages: 387-395
• Publication/Series: Nuclear Engineering and Design
• Volume: 253
• Links: http://dx.doi.org/10.1016/j.nucengdes.2011.10.071
• Document type: Journal article
• Publisher: Elsevier
• Topic: Natural Sciences; Physical Sciences
• Status: Published
• ISBN/ISSN/Other: ISSN: 1872-759X