Context: I’m attempting to simulate fluid flow in a heat pipe. It’s a two-phase VOF model with k-omega. I’m running the Lee model for evaporation-condensation with alternative energy treatment enabled for transient calculations using PTL table. The relaxation parameters in the Lee model are 0.1 evaporation (default) and 10,000 condensation. I have two meshes of the heat pipe (27k elements and 45k elements). Both meshes have inflation layers near walls and the mesh quality is good (skewness and orthogonality are good).<\/p>\n
My residuals look fine until everything suddenly spikes and the sim fails. I reduced my under-relaxation parameters but everything still abruptly diverges. There’s no indication of imminent failure in the residuals or physical variables.<\/p>\n
I’m at my wits end here. I could try to increase the mesh density but other papers I’ve read have used similarly sized meshes to great results. I’m not sure what else I can do if there’s nothing in the logs for me to troubleshoot.<\/p>\n","protected":false},"template":"","class_list":["post-371526","topic","type-topic","status-closed","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