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-   -   UDF for pressure at outlet (https://www.cfd-online.com/Forums/fluent/79095-udf-pressure-outlet.html)

 mireis August 12, 2010 06:19

UDF for pressure at outlet

I'm trying to create a UDF function for the pressure at the outlet. I know the mass flow rate and temperature at this point so theoretically my pressure is a function of the velocity at the outlet. Is it possible to implement a UDF function that calculates the pressure as a function of the velocity?

I have tried with this one but Fluent says there is a "parse error".

Code:

``` #include "udf.h"   #define MDOT_OUT 0.000005  /* desired mass flow rate at the outlet  kg/s */ #define S_OUT 0.00000003905707  /* outlet surface in the model where the mass flow rate is MDOT_OUT  m^2 */ #define R 63.32 /* universal constant for gases  J/kg/K */ #define T 300.13 /* temperature  K */   DEFINE_PROFILE(outlet_pressure, thread, nv) { Thread *t; face_t f; cell_t c; real CTE; real actual_velocity=C_U(c,t); /* real pressure = C_P(c,t); CTE=MDOT_OUT*R*T/S_OUT; begin_f_loop (f,t) { F_PROFILE(f,thread,nv) = CTE/actual_velocity; } end_f_loop (f,t) }```

Any suggestions would be greatly appreaciated :)

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