A robust algorithm for computational floating body dynamics
We present a non-iterative algorithm, FloatStepper, for coupling the motion of a rigid body and an incompressible fluid in computational fluid dynamics (CFD) simulations. The purpose of the algorithm is to remove the so-called added mass instability problem, which may arise when a light, floating bo...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The Royal Society
2024-04-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/10.1098/rsos.231453 |
| _version_ | 1797198554750517248 |
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| author | J. Roenby S. Aliyar H. Bredmose |
| author_facet | J. Roenby S. Aliyar H. Bredmose |
| author_sort | J. Roenby |
| collection | DOAJ |
| description | We present a non-iterative algorithm, FloatStepper, for coupling the motion of a rigid body and an incompressible fluid in computational fluid dynamics (CFD) simulations. The purpose of the algorithm is to remove the so-called added mass instability problem, which may arise when a light, floating body interacts with a heavy fluid. The idea underlying the presented coupling method is to precede every computational time step by a series of prescribed probe body motions in which the fluid response is determined, thus revealing the decomposition of the net force and torque into two components: (i) an added mass contribution proportional to the instantaneous body acceleration and (ii) all other forces and torques. The algorithm is implemented and released as an open-source extension module to the widely used CFD toolbox, OpenFOAM, as an alternative to the existing body motion solvers. The accuracy of the algorithm is investigated with several single-phase and two-phase flow benchmark cases. The benchmarks demonstrate excellent stability properties, allowing simulations even with massless bodies. They also highlight aspects of the implementation, such as the mesh motion method, where it can be improved to further enhance the flexibility and predictive capabilities of the code. |
| first_indexed | 2024-04-24T07:01:43Z |
| format | Article |
| id | doaj.art-244db30c34294305b3a18bbf8cfa399b |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-04-24T07:01:43Z |
| publishDate | 2024-04-01 |
| publisher | The Royal Society |
| record_format | Article |
| series | Royal Society Open Science |
| spelling | doaj.art-244db30c34294305b3a18bbf8cfa399b2024-04-22T07:53:53ZengThe Royal SocietyRoyal Society Open Science2054-57032024-04-0111410.1098/rsos.231453A robust algorithm for computational floating body dynamicsJ. Roenby0S. Aliyar1H. Bredmose2Stromning Aps, Luftmarinegade 62 , København K 1432, DenmarkDepartment of Wind and Energy Systems, Technical University of Denmark, Nils Koppels Alle , Kgs. Lyngby 2800, DenmarkDepartment of Wind and Energy Systems, Technical University of Denmark, Nils Koppels Alle , Kgs. Lyngby 2800, DenmarkWe present a non-iterative algorithm, FloatStepper, for coupling the motion of a rigid body and an incompressible fluid in computational fluid dynamics (CFD) simulations. The purpose of the algorithm is to remove the so-called added mass instability problem, which may arise when a light, floating body interacts with a heavy fluid. The idea underlying the presented coupling method is to precede every computational time step by a series of prescribed probe body motions in which the fluid response is determined, thus revealing the decomposition of the net force and torque into two components: (i) an added mass contribution proportional to the instantaneous body acceleration and (ii) all other forces and torques. The algorithm is implemented and released as an open-source extension module to the widely used CFD toolbox, OpenFOAM, as an alternative to the existing body motion solvers. The accuracy of the algorithm is investigated with several single-phase and two-phase flow benchmark cases. The benchmarks demonstrate excellent stability properties, allowing simulations even with massless bodies. They also highlight aspects of the implementation, such as the mesh motion method, where it can be improved to further enhance the flexibility and predictive capabilities of the code.https://royalsocietypublishing.org/doi/10.1098/rsos.231453numerical methodsadded masscomputational fluid dynamicsOpenFOAMFloatStepperfloating body dynamics |
| spellingShingle | J. Roenby S. Aliyar H. Bredmose A robust algorithm for computational floating body dynamics Royal Society Open Science numerical methods added mass computational fluid dynamics OpenFOAM FloatStepper floating body dynamics |
| title | A robust algorithm for computational floating body dynamics |
| title_full | A robust algorithm for computational floating body dynamics |
| title_fullStr | A robust algorithm for computational floating body dynamics |
| title_full_unstemmed | A robust algorithm for computational floating body dynamics |
| title_short | A robust algorithm for computational floating body dynamics |
| title_sort | robust algorithm for computational floating body dynamics |
| topic | numerical methods added mass computational fluid dynamics OpenFOAM FloatStepper floating body dynamics |
| url | https://royalsocietypublishing.org/doi/10.1098/rsos.231453 |
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