{"id":373173,"date":"2024-07-23T08:26:50","date_gmt":"2024-07-23T08:26:50","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373173\/"},"modified":"2024-07-23T08:26:50","modified_gmt":"2024-07-23T08:26:50","slug":"373173","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/373173\/","title":{"rendered":"Reply To: Suddenly divergence in transient simulation with VOF"},"content":{"rendered":"

<p>Yes, it’s necessary to refine the mesh to capture some critical physics. But now the most important thing now for me is to achieve convergence in flow time for more than one thounsand seconds. Insufficient mesh density may be one reason. I understand flow regime changes in pool boiling or flow boiling, such as slug, bubbly, mist and the like. What I want to do now is to obtain a rough solution with less time consumption because deadline is approaching. \ud83d\ude02<\/p><p>But the biggest problem, I think, is highly related to the appearance of reversed flow. And it would appear actually. While the total temperature of reversed flow setting in pressure-outlet<\/strong> will increase because the air at upper tank will be heated, which is confirmed in my calculation before divergence, I have no idea that how total temperature of reversed flow change and specify it as constant initial temperature. It’s time when superheated fluid on the right pipe touched the air at lower temperature that caused some problems, I think.  <\/p><p>What could be possible solution? Extend calculation domain near the outlet? Or have a preliminary theoretical calculation and specify a time dependent reversed total temperature? <\/p><p>Thanks for you patient reply.<\/p><\/p>\n","protected":false},"template":"","class_list":["post-373173","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t