{"id":393131,"date":"2024-11-07T09:24:14","date_gmt":"2024-11-07T09:24:14","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/393131\/"},"modified":"2024-11-07T09:24:14","modified_gmt":"2024-11-07T09:24:14","slug":"393131","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/393131\/","title":{"rendered":"Reply To: turbulent viscosity ratio and convergence issues"},"content":{"rendered":"<p>&lt;p&gt;Hello Rob,&nbsp;&lt;\/p&gt;&lt;p&gt;So, I have checked the warning issues further by checking temperature, velocity, turbulent viscisity ratio contours at 450 iterations and 600 iterations and I think the problem is the outlet of the shell side.&nbsp;&lt;\/p&gt;&lt;p&gt;At 450 iterations, turbulent viscosity ratio was limited to less then 10 cells. Below are the turbulent viscosity ratio contour at inlet, middle and outlet of shell side.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/07-11-2024-1730971314-mceclip1.png\" width=\"460\" height=\"237\" \/>&lt;\/p&gt;&lt;p&gt;at 600 iterations, turbulent viscosity ratio increases to almost 2700 cells. below are the liqud &amp; turbulent viscosity ratio contours and Liq. Turbulent Viscosity reaches 1e5 limit.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/07-11-2024-1730971428-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/07-11-2024-1730971313-mceclip4.png\" width=\"587\" height=\"267\" \/>&lt;\/p&gt;&lt;p&gt;Do I need to improve the mesh at the outlet, I have drawn polyhedra mesh with zero inflation near shell wall.&nbsp;&lt;\/p&gt;&lt;p&gt;Or I need to increase the length of the outlet?&nbsp;&lt;\/p&gt;&lt;p&gt;What do you think on that?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393131","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=\"Hello Rob, So, I have checked the warning issues further by checking temperature, velocity, turbulent viscisity ratio contours at 450 iterations and 600 iterations and I think the problem is the outlet of the shell side. 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