{"id":52066,"date":"2021-02-09T14:17:49","date_gmt":"2021-02-09T14:17:49","guid":{"rendered":"\/forum\/forums\/topic\/convergence-issue-in-pcm-simulation-fluent\/"},"modified":"2021-02-09T14:17:49","modified_gmt":"2021-02-09T14:17:49","slug":"convergence-issue-in-pcm-simulation-fluent","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/convergence-issue-in-pcm-simulation-fluent\/","title":{"rendered":"Convergence issue in PCM simulation Fluent."},"content":{"rendered":"
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I have been trying to perform a PCM melting simulation in FLUENT, but am facing convergence issue. There is normal melting at start of simulation, but then there is a very sudden drop in temperature after which the system becomes completely unstable and goes back up to a very high temperature in the next timestep. <\/p>\n

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Mesh Quality:<\/p>\n

<\/p>\n<\/p>\n

Minimum Orthogonal Quality = 3.52907e-01 cell 323206 on zone 9 (ID: 406547 on partition: 0) at location (-1.57583e-02 2.41255e-03 1.67722e-02)<\/p>\n

(To improve Orthogonal quality , use "Inverse Orthogonal Quality" in Fluent Meshing,<\/p>\n

where Inverse Orthogonal Quality = 1 – Orthogonal Quality)<\/p>\n

<\/p>\n<\/p>\n

Maximum Aspect Ratio = 7.91960e+00 cell 193565 on zone 9 (ID: 276906 on partition: 0) at location (-1.39062e-02 2.66648e-03 1.59572e-02)<\/p>\n

<\/p>\n<\/p>\n

Domain Extents:<\/p>\n

x-coordinate: min (m) = -2.000000e-02, max (m) = 2.000000e-02<\/p>\n

y-coordinate: min (m) = -6.123234e-19, max (m) = 3.664102e-02<\/p>\n

z-coordinate: min (m) = 0.000000e+00, max (m) = 5.000000e-01<\/p>\n

Volume statistics:<\/p>\n

minimum volume (m3): 1.368996e-11<\/p>\n

maximum volume (m3): 5.474989e-10<\/p>\n

total volume (m3): 3.864102e-04<\/p>\n

Face area statistics:<\/p>\n

minimum face area (m2): 3.245439e-08<\/p>\n

maximum face area (m2): 1.006125e-06<\/p>\n

Checking mesh………………………<\/p>\n

Done.<\/p>\n

<\/p>\n

<\/p>\n<\/p>\n

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