A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows
This work presents a Direct Ghost Fluid Method (DGFM) as part of a two-fluid numerical framework suitable to model explosive gas and water flows resulting from underwater explosion (UNDEX). Due to the presence of explosive gas and water with shock waves in the modeling domain, classic Eulerian metho...
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2022/1627382 |
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| author | Nan Si Jinwon Park Alan J. Brown |
| author_facet | Nan Si Jinwon Park Alan J. Brown |
| author_sort | Nan Si |
| collection | DOAJ |
| description | This work presents a Direct Ghost Fluid Method (DGFM) as part of a two-fluid numerical framework suitable to model explosive gas and water flows resulting from underwater explosion (UNDEX). Due to the presence of explosive gas and water with shock waves in the modeling domain, classic Eulerian methods with inherent diffusion may not be effective. Numerical diffusion occurs due to nonphysical diffused density at material interfaces, which creates spurious pressure oscillations and significantly degrades the quality of the numerical results. To eliminate or minimize numerical diffusion, sharp interface methods having no mixed elements may be used in multifluid flow computations. The Direct Ghost Fluid Method (DGFM) described in this paper uses direct extrapolation of density (vice pressure) and tangential velocity from real to ghost fluid. The spurious pressure oscillations near the material interface are therefore minimized. One-, two-, and three-dimensional computational fluid dynamics (CFD) solvers that have DGFM as an essential part in their framework to model UNDEX interface conditions are developed, explored, and applied to the simulation of a series of benchmark problems. Excellent agreement is obtained among the simulations, the analytical solutions, and the experiments. |
| format | Article |
| id | doaj-art-77359b09412240089d5c8e30dfb49d2f |
| institution | Kabale University |
| issn | 1875-9203 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-77359b09412240089d5c8e30dfb49d2f2025-08-20T03:35:18ZengWileyShock and Vibration1875-92032022-01-01202210.1155/2022/1627382A Direct Ghost Fluid Method for Modeling Explosive Gas and Water FlowsNan Si0Jinwon Park1Alan J. Brown2Department of Aerospace and Ocean EngineeringPrincipal ResearcherDepartment of Aerospace and Ocean EngineeringThis work presents a Direct Ghost Fluid Method (DGFM) as part of a two-fluid numerical framework suitable to model explosive gas and water flows resulting from underwater explosion (UNDEX). Due to the presence of explosive gas and water with shock waves in the modeling domain, classic Eulerian methods with inherent diffusion may not be effective. Numerical diffusion occurs due to nonphysical diffused density at material interfaces, which creates spurious pressure oscillations and significantly degrades the quality of the numerical results. To eliminate or minimize numerical diffusion, sharp interface methods having no mixed elements may be used in multifluid flow computations. The Direct Ghost Fluid Method (DGFM) described in this paper uses direct extrapolation of density (vice pressure) and tangential velocity from real to ghost fluid. The spurious pressure oscillations near the material interface are therefore minimized. One-, two-, and three-dimensional computational fluid dynamics (CFD) solvers that have DGFM as an essential part in their framework to model UNDEX interface conditions are developed, explored, and applied to the simulation of a series of benchmark problems. Excellent agreement is obtained among the simulations, the analytical solutions, and the experiments.http://dx.doi.org/10.1155/2022/1627382 |
| spellingShingle | Nan Si Jinwon Park Alan J. Brown A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows Shock and Vibration |
| title | A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows |
| title_full | A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows |
| title_fullStr | A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows |
| title_full_unstemmed | A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows |
| title_short | A Direct Ghost Fluid Method for Modeling Explosive Gas and Water Flows |
| title_sort | direct ghost fluid method for modeling explosive gas and water flows |
| url | http://dx.doi.org/10.1155/2022/1627382 |
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