{"id":450607,"date":"2026-01-18T17:40:35","date_gmt":"2026-01-18T17:40:35","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-analysis-ale-method-energy-loss\/"},"modified":"2026-01-18T17:40:35","modified_gmt":"2026-01-18T17:40:35","slug":"fsi-analysis-ale-method-energy-loss","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fsi-analysis-ale-method-energy-loss\/","title":{"rendered":"FSI analysis ALE method, energy loss"},"content":{"rendered":"<p>&lt;p&gt;I am trying to implement the ALE method for an analysis of a section of a hull impacting the water.&lt;\/p&gt;&lt;p&gt;I managed to create the model and run the analysis.&lt;\/p&gt;&lt;p&gt;I don&#8217;t understand why there is such a significant loss of energy during impact. In similar models using the SPH method, I had a maximum loss of 10% of the initial energy, but in this model it is almost halved.&lt;\/p&gt;&lt;p&gt;I have already tried using both SOLID and SHELL elements with different materials, ELASTIC, RIGID, COMPOSITE&#8230; but the result is always similar.&lt;\/p&gt;&lt;p&gt;Currently, in the model, I have defined a water tank with EOS_GRUNEISEN and the upper air with MAT_VOID.&lt;\/p&gt;&lt;p&gt;Is it normal for such a high loss to occur, or is it necessary to implement other KEYWORDS?&lt;\/p&gt;&lt;p&gt;Thank you in advance.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/01\/18-01-2026-1768757411-Screenshot 2026-01-18 182830.png\" alt=\"Energy plot\" width=\"706\" height=\"332\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/01\/18-01-2026-1768757564-Screenshot 2026-01-18 183222.png\" alt=\"\" width=\"501\" height=\"368\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-450607","topic","type-topic","status-publish","hentry","topic-tag-Forcecalculation-1","topic-tag-mesh","topic-tag-student-version"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am trying to implement the ALE method for an analysis of a section of a hull impacting the water.I managed to create the model and run the analysis.I don&#039;t understand why there is such a significant loss of energy during impact. 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