On stability and relaxation techniques for partitioned fluid‐structure interaction simulations
Abstract The stability of relaxation techniques has been studied for strongly coupled fluid‐structure interaction (FSI) with application to a cantilever immersed in channel flow. The fluid is governed by Navier–Stokes equations for incompressible flow condition using turbulence modeling, and the sol...
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| Format: | Article |
| Language: | English |
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Wiley
2022-10-01
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| Series: | Engineering Reports |
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| Online Access: | https://doi.org/10.1002/eng2.12514 |
| _version_ | 1811230256421404672 |
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| author | Johan Lorentzon Johan Revstedt |
| author_facet | Johan Lorentzon Johan Revstedt |
| author_sort | Johan Lorentzon |
| collection | DOAJ |
| description | Abstract The stability of relaxation techniques has been studied for strongly coupled fluid‐structure interaction (FSI) with application to a cantilever immersed in channel flow. The fluid is governed by Navier–Stokes equations for incompressible flow condition using turbulence modeling, and the solid is governed by the equation of motion with compressible material modeling. The applied kinematic description is Lagrangian for the solid and Eulerian for the fluid. The coupling of the state solvers is achieved by the Arbitrary Lagrange–Euler procedure, which involves a mesh motion solver, and the FSI procedure is stabilized by relaxation. It is shown that the stability can be related to the frequency shift caused by FSI, and they follow the same rate for the shape factor of the structure with an offset. The results correlate well to theoretical results and show that all relaxations fail for sufficient high‐frequency shift for given mesh resolution. We also propose a continuation technique to stabilize the solution near the instability region, which improves efficiency and can be integrated easily for the black‐box FSI solution procedure. |
| first_indexed | 2024-04-12T10:26:41Z |
| format | Article |
| id | doaj.art-23a7a3b80767493c9ea8fb14d008ea15 |
| institution | Directory Open Access Journal |
| issn | 2577-8196 |
| language | English |
| last_indexed | 2024-04-12T10:26:41Z |
| publishDate | 2022-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Engineering Reports |
| spelling | doaj.art-23a7a3b80767493c9ea8fb14d008ea152022-12-22T03:36:57ZengWileyEngineering Reports2577-81962022-10-01410n/an/a10.1002/eng2.12514On stability and relaxation techniques for partitioned fluid‐structure interaction simulationsJohan Lorentzon0Johan Revstedt1Department of Theoretical Chemistry Lund University Lund SwedenDepartment of Energy Sciences, LTH Lund University Lund SwedenAbstract The stability of relaxation techniques has been studied for strongly coupled fluid‐structure interaction (FSI) with application to a cantilever immersed in channel flow. The fluid is governed by Navier–Stokes equations for incompressible flow condition using turbulence modeling, and the solid is governed by the equation of motion with compressible material modeling. The applied kinematic description is Lagrangian for the solid and Eulerian for the fluid. The coupling of the state solvers is achieved by the Arbitrary Lagrange–Euler procedure, which involves a mesh motion solver, and the FSI procedure is stabilized by relaxation. It is shown that the stability can be related to the frequency shift caused by FSI, and they follow the same rate for the shape factor of the structure with an offset. The results correlate well to theoretical results and show that all relaxations fail for sufficient high‐frequency shift for given mesh resolution. We also propose a continuation technique to stabilize the solution near the instability region, which improves efficiency and can be integrated easily for the black‐box FSI solution procedure.https://doi.org/10.1002/eng2.12514FSILESpartitionedrelaxationstability |
| spellingShingle | Johan Lorentzon Johan Revstedt On stability and relaxation techniques for partitioned fluid‐structure interaction simulations Engineering Reports FSI LES partitioned relaxation stability |
| title | On stability and relaxation techniques for partitioned fluid‐structure interaction simulations |
| title_full | On stability and relaxation techniques for partitioned fluid‐structure interaction simulations |
| title_fullStr | On stability and relaxation techniques for partitioned fluid‐structure interaction simulations |
| title_full_unstemmed | On stability and relaxation techniques for partitioned fluid‐structure interaction simulations |
| title_short | On stability and relaxation techniques for partitioned fluid‐structure interaction simulations |
| title_sort | on stability and relaxation techniques for partitioned fluid structure interaction simulations |
| topic | FSI LES partitioned relaxation stability |
| url | https://doi.org/10.1002/eng2.12514 |
| work_keys_str_mv | AT johanlorentzon onstabilityandrelaxationtechniquesforpartitionedfluidstructureinteractionsimulations AT johanrevstedt onstabilityandrelaxationtechniquesforpartitionedfluidstructureinteractionsimulations |