{"id":381512,"date":"2024-09-04T10:06:06","date_gmt":"2024-09-04T10:06:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/381512\/"},"modified":"2024-09-04T10:06:06","modified_gmt":"2024-09-04T10:06:06","slug":"381512","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/381512\/","title":{"rendered":"Reply To: Convergence issue with Non Equilibrium RPI Model"},"content":{"rendered":"<p>&lt;p&gt;The y+ is already at 40 and rising as we move along the channel. The model stabilized when I switched the drag force from Ishii-Zuber to Schiller Naumann. The model worked upto 400 K and then the same problems. I added Enhanced Wall Treatment to my k-epsilon model and it allowed me to go all the way to my desired temp of 460 K. The problem is now the Lift force. I chose to take Fluent User Guide&#8217;s tip and solved the case without Lift and Virtual Mass Force temporarily but adding any of the Lift Correlations now gives very non converging results.&nbsp;&lt;\/p&gt;&lt;p&gt;Physically, I am expecting to see a drop in wall temperature where the boiling starts to happen (at around 1\/3 of the length of the channel) but there is no drop. And my guess is because the bubbles near the wall do not rise to make way for liquid to take its place and boil. This can be due to no lift force or the Wall Lubrication force not doing its job. Here is a contour of the gas vol frac&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725444352-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381512","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=\"The y+ is already at 40 and rising as we move along the channel. The model stabilized when I switched the drag force from Ishii-Zuber to Schiller Naumann. The model worked upto 400 K and then the same problems. I added Enhanced Wall Treatment to my k-epsilon model and it allowed me to go all\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/381512\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Convergence issue with Non Equilibrium RPI Model | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"The y+ is already at 40 and rising as we move along the channel. The model stabilized when I switched the drag force from Ishii-Zuber to Schiller Naumann. The model worked upto 400 K and then the same problems. 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The model stabilized when I switched the drag force from Ishii-Zuber to Schiller Naumann. The model worked upto 400 K and then the same problems. 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