{"id":388390,"date":"2024-10-07T12:41:56","date_gmt":"2024-10-07T12:41:56","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388390\/"},"modified":"2024-10-07T12:41:56","modified_gmt":"2024-10-07T12:41:56","slug":"388390","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/388390\/","title":{"rendered":"Reply To: Three-phase Simulation: Eulerian Model for Free-Surface Flow around Bridge Pier"},"content":{"rendered":"<p>&lt;p&gt;Thank you for your input. I&rsquo;d like to clarify the problem I am working on. My focus is on a clear water scenario, meaning that I am not concerned with sediment inflow from upstream. Instead, I aim to determine the maximum potential scour depth. The bed material consists of uniform-sized particles.&lt;\/p&gt;&lt;p&gt;In the Multiphase Model setup, along with selecting Inhomogeneous Models: Eulerian, I&rsquo;m wondering if I should enable the DDPM model or the Multi-fluid VOF model, or possibly both. From my understanding:&lt;\/p&gt;&lt;p&gt;&nbsp;&nbsp; &#8211; The DDPM model would allow me to define sand as a discrete phase, while air and water are treated as Eulerian phases. This would be useful if I want to track the individual sand particles&#8217; behavior.&lt;\/p&gt;&lt;p&gt;&nbsp;&nbsp; &#8211; The Multi-fluid VOF model would be essential for capturing the air-water interface, especially for simulating free surface dynamics.&lt;\/p&gt;&lt;p&gt;Since I&rsquo;m focusing on clear water scour and need to model both the air-water interaction and sand particles as discrete entities, should I enable both the DDPM and Multi-fluid VOF models for this scenario?&lt;\/p&gt;&lt;p&gt;At the start of the simulation, I would initialize the domain filled with air, then use the Patch command to specify where the water and sediment are located. I plan to set a velocity inlet for water inflow and a pressure outlet for the outlet and top surface.&lt;\/p&gt;&lt;p&gt;&lt;br&gt;I would appreciate any suggestions you may have regarding the simulation setup. Thank you for your time and assistance.&lt;\/p&gt;&lt;p&gt;Best regards,&lt;\/p&gt;&lt;p&gt;Luca&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-388390","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=\"Thank you for your input. I\u2019d like to clarify the problem I am working on. My focus is on a clear water scenario, meaning that I am not concerned with sediment inflow from upstream. Instead, I aim to determine the maximum potential scour depth. 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