Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis
Fluid cavitation constitutes an expensive computational nuisance in underwater-shock response calculations for structures at or just below the free surface. In order to avoid the use of a large array of cavitating acoustic finite elements (CAFE), various wet-surface approximations have been proposed...
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| Format: | Article |
| Language: | English |
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Wiley
2001-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2001/853074 |
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| author | Michael A. Sprague Thomas L. Geers |
| author_facet | Michael A. Sprague Thomas L. Geers |
| author_sort | Michael A. Sprague |
| collection | DOAJ |
| description | Fluid cavitation constitutes an expensive computational nuisance in underwater-shock response calculations for structures at or just below the free surface. In order to avoid the use of a large array of cavitating acoustic finite elements (CAFE), various wet-surface approximations have been proposed. This paper examines the performance of two such approximations by comparing results produced by them for 1-D canonical problems with corresponding results produced by more rigorous CAFE computations. It is found that the fundamental limitation of wet-surface approximations is their inability to capture fluid-accretion effects. As an alternative, truncated CAFE fluid meshes with plane-wave radiation boundaries are shown to give good results. In fact, a single layer of CAFE is found to be comparable in accuracy to the better of the wet-surface approximations. The paper concludes with an examination of variations in CAFE modeling. |
| format | Article |
| id | doaj-art-cbb8b98d77b841d6880cd195cfa2ca34 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-cbb8b98d77b841d6880cd195cfa2ca342025-02-03T01:01:49ZengWileyShock and Vibration1070-96221875-92032001-01-018210512210.1155/2001/853074Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock AnalysisMichael A. Sprague0Thomas L. Geers1Center for Acoustics, Mechanics and Materials, Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427, USACenter for Acoustics, Mechanics and Materials, Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427, USAFluid cavitation constitutes an expensive computational nuisance in underwater-shock response calculations for structures at or just below the free surface. In order to avoid the use of a large array of cavitating acoustic finite elements (CAFE), various wet-surface approximations have been proposed. This paper examines the performance of two such approximations by comparing results produced by them for 1-D canonical problems with corresponding results produced by more rigorous CAFE computations. It is found that the fundamental limitation of wet-surface approximations is their inability to capture fluid-accretion effects. As an alternative, truncated CAFE fluid meshes with plane-wave radiation boundaries are shown to give good results. In fact, a single layer of CAFE is found to be comparable in accuracy to the better of the wet-surface approximations. The paper concludes with an examination of variations in CAFE modeling.http://dx.doi.org/10.1155/2001/853074 |
| spellingShingle | Michael A. Sprague Thomas L. Geers Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis Shock and Vibration |
| title | Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis |
| title_full | Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis |
| title_fullStr | Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis |
| title_full_unstemmed | Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis |
| title_short | Computational Treatments of Cavitation Effects in Near-Free-Surface Underwater Shock Analysis |
| title_sort | computational treatments of cavitation effects in near free surface underwater shock analysis |
| url | http://dx.doi.org/10.1155/2001/853074 |
| work_keys_str_mv | AT michaelasprague computationaltreatmentsofcavitationeffectsinnearfreesurfaceunderwatershockanalysis AT thomaslgeers computationaltreatmentsofcavitationeffectsinnearfreesurfaceunderwatershockanalysis |