{"id":289988,"date":"2023-06-22T16:01:07","date_gmt":"2023-06-22T16:01:07","guid":{"rendered":"\/forum\/forums\/topic\/user-defined-function-not-working-as-intended\/"},"modified":"2023-06-22T16:01:07","modified_gmt":"2023-06-22T16:01:07","slug":"user-defined-function-not-working-as-intended","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/user-defined-function-not-working-as-intended\/","title":{"rendered":"User Defined Function not working as Intended"},"content":{"rendered":"

Shown below is contour plot of the mole fraction of a gas traveling from left to right. <\/p>\n

I am attempting to simulate the gas in question permeating into the circular holes (gas 1). A second gas is also permeating out on a 1:1 molar basis, ‘swapping’ with the first gas (gas 2). 3 user defined functions have been made to mimic this behavior. One handles gas 1 permeating into the circles, the second handles gas 2 permeating out from the circles and the third is applied to the mass source term to handle the difference in molecular masses. <\/p>\n

I have run this simulation numerous times and get reasonable results until my fluid flows beyond my last row of circles. Both gas 1 and gas 2 sharply decrease at this point even though there is no surface that has the udf applied to it. I created multiple vertical planes at various points along the flow and used “Surface Report – Mass Weighted Average” to find mass percent’s of both gas 1 and gas 2. <\/p>\n

I would appreciate any guidance on what could be causing my issue. <\/p>\n

Thank You <\/p>\n

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