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#1 |
New Member
MB
Join Date: Sep 2022
Posts: 8
Rep Power: 3 ![]() |
Dears,
I'm trying to load a simple UDF to mimic ideal gas density in Fluent (2023R1). Fluent is crashing as soon as I run the simulation (floating point error). I'm using the below udf: #include <udf.h> #include <global.h> /* The variables below need to be set for a particular gas */ /* CO2 */ #define RGASU UNIVERSAL_GAS_CONSTANT #define MWT 44.01 /* REFERENCE STATE */ #define P_REF 101325 #define T_REF 288.15 DEFINE_PROPERTY(cell_density,c,t) { real rho; real p; real p_operating; real T; p_operating=RP_Get_Real("operating-pressure"); p=C_P(c,t); T=C_T(c,t); rho= (p+p_operating)/(RGASU*T/MWT); return rho; } If I replace p and T by constant values, the solver works fine. The issue occurs only when I let p or T to be unknown (i.e. to be calculated by fluent). Anything wrong in the UDF? Any thoughts on this would be appreciated. Thanks, |
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#2 |
Senior Member
Alexander
Join Date: Apr 2013
Posts: 2,363
Rep Power: 34 ![]() ![]() |
how to calculate pressure for your UDF if density is unknown for initial step?
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#3 |
New Member
MB
Join Date: Sep 2022
Posts: 8
Rep Power: 3 ![]() |
Hi Alexander, thanks for your message.
Looking at the udf again, I have already defined the pressure initially. The problem as it appears to me is that I am not able to call the updated values in the UDF. Best, Last edited by Mohamad.Baassiri; August 15, 2023 at 16:40. |
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Tags |
fluent - udf |
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