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| NKS Programme Area: | NKS-R | | Research Area: | Thermo hydraulics | | Report Number: | NKS-127 | | Report Title: | Fluid-Structure Interaction Analysis of a Water Pool under Loading Caused by Steam Injection | | Activity Acronym: | Delipool | | Authors: | Antti Timperi, Timo Pättikangas, Jarto Niemi, Mikko Ilvonen | | Abstract: | Fluid-structure interaction (FSI) calculations were carried out by coupling CFD and structural analysis codes. MpCCI 3.0 was used for coupling Fluent CFD code with ABAQUS FE code. ES-FSI was used for coupling Star-CD CFD code with ABAQUS. FSI analyses, in which the calculation was carried out entirely in ABAQUS, were also performed. In this case, acoustic elements were used for the fluid and the acoustic and structural domains were coupled. FSI calculations were performed for simple test cases and for a test pool at Lappeenranta University of Technology. The Method of Images was studied as an alternative method for the analyses of the pool. Particularly, the determination of pressure source for the method was studied. Earlier work carried out with the homogenous two-phase model was continued by testing the model with Fluent. Calculation of condensation of steam in a water pool was tested with a new implementation.
The two-directionally coupled simulations of the pool with MpCCI and ES-FSI were found to be numerically instable. It was concluded that an implicit coupling method may have to be used in order to avoid the instability. Calculations of the pool were finally performed by using one-directional coupling. In the simulations with MpCCI, the incompressible and compressible VOF models of Fluent were used. With ES-FSI, the incompressible VOF model of Star-CD was used for modelling the beginning of a steam injection experiment. The magnitudes of pressure and stress peaks in the simulation and experiment were of comparable size. Otherwise, however, differences between the simulation and experiment were large due to the simplifications used in the simulation. Results obtained with the acoustic-structural FE analyses were compared to analytical and experimental results. The results indicated that the coupled acoustic-structural analysis can be used for calculating the coupled eigenmodes of BWR pressure suppression pools. | | Keywords: | CFD; FE; fluid-structure interaction; steam injection; pressure suppression pool | | Publication date: | 01 Apr 2006 | | ISBN: | ISBN: 87-7893-189-4 | | Number of downloads: | 11420 | | Download: |  NKS-127.pdf |
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