When I read a msh file into Fluent and try to implement a Momentum source based on an Expression, it fails to get applied and my source term gets disabled. Example: Enable an â€œX Momentumâ€ source in a zone and set the field to the expression type. Enter the expression: AreaAve(StaticPressure,[‘wall-mid’])/1[m]. (Or create the expression first and then assign it) Click â€œOKâ€ on the â€œX Momentum sourcesâ€ panel. The interface will briefly show the proper thing (one momentum source for X), then will disable the momentum sources checkbox. Why does this happen? Is there a workaround
March 17, 2023 at 8:59 amFAQParticipant
This is a known defect and it affected releases 2021R2, 2022R1 and 2022R2. This happens only with expressions which cannot be evaluated. The workaround is to back all the way out of the zone setup and redo all the steps to set up the source. It should work with the second try. If you are working with a .cas file, save the save the cas (source term will not be set up, but expression can be present under Named Expressions), close down Fluent, relaunch and repeat the steps to creating the source
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