{"id":371642,"date":"2024-07-12T11:52:39","date_gmt":"2024-07-12T11:52:39","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/371642\/"},"modified":"2024-07-12T11:52:39","modified_gmt":"2024-07-12T11:52:39","slug":"371642","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/371642\/","title":{"rendered":"Reply To: Two-way FSI: It&#8217;s impossible to simulate a cantilever discharging pipe in Ansys"},"content":{"rendered":"<p>&lt;p&gt;Before starting an FSI simulation, you should run separate fluids and structural simulations using representative loads.&lt;\/p&gt;<\/p>\n<ul>\n<li>Check that the basic setup is correct for each side<\/li>\n<li>Use settings that are as close as possible to the planned FSI simulation (same time step size, etc)<\/li>\n<li>If it&rsquo;s difficult to provide representative fluid loads, you could run a System Coupling simulation with loads passed 1-way from Fluent to Mechanical<\/li>\n<\/ul>\n<p>&lt;p&gt;There are a number of convergence controls, so it&rsquo;s easy to head down the wrong path. In general start with:&lt;br&gt;\u2012 Default # of Coupling Iterations: Min: 1, Max 5 (for transients)&lt;br&gt;\u2012 Default Data Transfer Under Relaxation Factor: 1&lt;br&gt;\u2012 Perhaps 5 Fluent iterations per Coupling Iteration (for transients), but this is case dependent.&lt;br&gt;\u2012 A Time Step Size based on the physics you need to resolve&lt;br&gt;&bull; 1\/20th of the oscillation period corresponding to the highest structural frequency of interest&lt;br&gt;&bull; Flow field Courant number.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-371642","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Before starting an FSI simulation, you should run separate fluids and structural simulations using representative loads.Check that the basic setup is correct for each sideUse settings that are as close as possible to the planned FSI 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