Empirical optimization of sponge layers for enhanced accuracy in simulations of compressible cavitation
A numerical method for implementing sponge layer boundary conditions in compressible cavitating flows using the homogeneous mixture approach has been validated, which can effectively absorb the non-physical boundary reflection. For that, a set of more robust formulations have been developed and inte...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/450854 |
| Acceso en línea: | https://hdl.handle.net/2117/450854 https://dx.doi.org/10.1016/j.oceaneng.2026.124263 |
| Access Level: | acceso abierto |
| Palabra clave: | Sponge layer Numerical robustness Homogeneous mixture model Compressible cavitation Computational Fluid Dynamics (CFD) Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| Sumario: | A numerical method for implementing sponge layer boundary conditions in compressible cavitating flows using the homogeneous mixture approach has been validated, which can effectively absorb the non-physical boundary reflection. For that, a set of more robust formulations have been developed and integrated into the commercial numerical solver ANSYS Fluent®. A numerical assessment of their design tunable parameters, such as time step, sponge layer length, and sound speed, has been conducted for optimization. As a result, a novel non-dimensional coefficient combining these parameters has been introduced. Then, well-defined test cases, such as a 1D compressible cavitating Sod shock tube using the equation of state, a quasi-3D cavitation bubble collapse, and the cavitating flow behind a wedge employing a transport equation model have been used for validation. The results obtained with the optimized sponge layers are promising and they suggest that low reflection levels (<0.1 %) can be achieved when the value of this non-dimensional coefficient is higher than 6. In summary, the optimized sponge layer model has shown good efficiency and robustness in the simulation of compressible cavitating flows. |
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