{"id":183906,"date":"2021-07-26T16:01:50","date_gmt":"2021-07-26T16:01:50","guid":{"rendered":"\/forum\/forums\/reply\/183906\/"},"modified":"2021-07-26T16:11:54","modified_gmt":"2021-07-26T16:11:54","slug":"183906","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/183906\/","title":{"rendered":"Reply To: Which solution method (scheme) should I select for multiphase flow (pumping gas to blow water out)?"},"content":{"rendered":"<p>By using standard version, I have already meshed the whole pipe network with way finer body sizing meshing with 5 layers default inflation, while the elbows and tees were refined with more fined surface sizing meshing.<br \/>\nBody meshing element size : 3e-2<br \/>\nElbows and tees element size: 5e-3<br \/>\nNode: 2635812<br \/>\nElement: 7373330<br \/>\nQuality Mesh Metric: <br \/>\nOrthogonal Quality: mainly ranging 0.75 &#8211; 0.9<br \/>\nSkewness: mainly ranging 0 &#8211; 0.25<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/304\/ZOGHIZ0NTO04.png\" width=\"1555\" height=\"1018\" \/><br \/>\nHybrid Initiation with water patched inside the pipe model<br \/>\nMethod: PISO<br \/>\nControl: Default Under-relaxation factor<br \/>\nBoundary Conditions: 3 Inlets with each 5 psi Nitrogen gas pumping into the pipe network to simulate pumping water out of the only outlet<br \/>\nTime Step: 200 <br \/>\nTime Step Size : 4e-5<br \/>\nMax iteration\/time step : 40<br \/>\n1st iteration :Global Courant Number [Explicit VOF Criteria] : 5.1802<br \/>\n1189th iteration : Global Courant Number [Explicit VOF Criteria] : 2.24168<\/p>\n<p>Below is my residual graph of calculation from 1st to 1189th iteration. Here are two questions hope for answer! Thanks!!!<br \/>\n<strong>I would like to ask, after refining, is the residual graph below satisfactory and is it reaching convergence?<\/strong><br \/>\n<strong>When every time step complete, I saw it showed &#8220;solution is converged&#8221;, does this indication mean my setup already having reliable simulation and obtaining residual convergence<\/strong><\/p>\n<p><\/p>\n","protected":false},"template":"","class_list":["post-183906","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=\"By using standard version, I have already meshed the whole pipe network with way finer body sizing meshing with 5 layers default inflation, while the elbows and tees were refined with more fined surface sizing meshing. 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