{"id":389547,"date":"2024-10-14T17:12:57","date_gmt":"2024-10-14T17:12:57","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lsdyna-coupling\/"},"modified":"2024-10-15T17:18:53","modified_gmt":"2024-10-15T17:18:53","slug":"lsdyna-coupling","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lsdyna-coupling\/","title":{"rendered":"Fluid-structure interaction coupling"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;&lt;p&gt;Hello,&lt;br&gt;&lt;br&gt;I am using LSDYNA to model (3D) appropriate interactions between various parts of a floating fluid-solid system as shown in the attached graphic. A rigid body with an air void is floating in water and the air is trapped inside the void space of the floating object. Both water and air are modeled as ALE multi material group. Can you advice how I should define the following contact interactions?&lt;br&gt;&lt;br&gt;1. water and tank &#8211; I am using LAGRANGE_IN_SOLID with PFAC=0.001. Is it appropriate?&lt;br&gt;2. water and the float &#8211; same as above&lt;br&gt;3. water and entrained air &#8211; EULER_IN_EULER&lt;br&gt;4. floating object and entrained air &#8211; This is needed to gravity initialize the system as the weight of the floating body will compress the entrained air. Also, there will be a vertical seismic excitation on the system which will cause interactions among various components. I am not sure what types of interaction I should use. I would greatly appreciate any suggestions.<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/14-10-2024-1728925910-Fluid-solid-interaction.jpg\" alt=\"\" \/>&lt;br&gt;&lt;br&gt;Thank you,&lt;br&gt;Mamun&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389547","topic","type-topic","status-publish","hentry","topic-tag-2-way-coupled-fsi","topic-tag-contact-and-coupling"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I am using LSDYNA to model (3D) appropriate interactions between various parts of a floating fluid-solid system as shown in the attached graphic. A rigid body with an air void is floating in water and the air is trapped inside the void space of the floating object. 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