{"id":368337,"date":"2024-05-23T14:28:04","date_gmt":"2024-05-23T14:28:04","guid":{"rendered":"\/forum\/forums\/reply\/368337\/"},"modified":"2024-05-23T14:28:04","modified_gmt":"2024-05-23T14:28:04","slug":"368337","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/368337\/","title":{"rendered":"Reply To: VOF Free Surface Deformation"},"content":{"rendered":"<p>&lt;div&gt;I followed your instructions and began the simulation. Initially, I set both the &#8220;Open Channel Flow&#8221; and &#8220;Open Channel Wave BC&#8221; with a &#8220;Velocity Inlet&#8221; boundary condition (BC). By doing this, I realized that I might have disregarded the &#8220;Open Channel Flow&#8221; since it should actually have a &#8220;Pressure Inlet&#8221; BC. I also tried the reverse setup.&lt;\/div&gt;&lt;div&gt;&nbsp;&lt;\/div&gt;&lt;div&gt;In both configurations, the pressure differential (dP) was minimal and almost identical when I set the upper boundary condition as &#8220;Symmetry&#8221;. I then attempted to change the upper boundary condition to &#8220;Pressure Outlet&#8221;. Interestingly, although the iterations proceeded normally, I encountered a reverse flow error and observed unusual (wrong) velocity contours, as shown below.&lt;\/div&gt;&lt;div&gt;&nbsp;&lt;\/div&gt;&lt;div&gt;I wonder what is the reason of this situation, everything is same just I changed upper BC. dP value is also strange but at least it&#8217;s big. I believe that if I can solve this problem, I&#8217;ll start to get logical free surface elevation.&lt;\/div&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/23-05-2024-1716474442-residual_reverse.JPG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/23-05-2024-1716474460-velocity_contourrrr.JPG\" alt=\"\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/23-05-2024-1716474477-pressureee.JPG\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-368337","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/368337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/368337\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=368337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}