UDF to change speed of fan

visitor · February 21, 2016, 02:32

Dear sirs/madams

Tried to use the following code to increment fan speed. I did not think that the inlet_mf matters, but it sounds like it does. Entered in cell-zone, mesh motion, speed field; inlet_mf.

Error message; shaftchip-exec: inlet_mf: wrong return type: double udf function expectedchip-exec: ...

Any suggestions please? Thanks in advance.

#include "udf.h"
DEFINE_PROFILE(inlet_mf,thread,i)
{
float t = CURRENT_TIME;
face_t f;
begin_f_loop(f, thread)
{
F_PROFILE(f,thread,i) = t*5;
}
end_f_loop(f,thread)
}

`e` · February 29, 2016, 17:21

Are you using the moving/deforming mesh model? The DEFINE_PROFILE macro is for specifying a boundary condition such as a developed inlet velocity. Are you modelling the fan or are you simply altering the inlet conditions of a boundary face?

February 21, 2016, 02:32	UDF to change speed of fan	#1
visitor Senior Member AH Join Date: Apr 2014 Posts: 282 Rep Power: 13	Dear sirs/madams Tried to use the following code to increment fan speed. I did not think that the inlet_mf matters, but it sounds like it does. Entered in cell-zone, mesh motion, speed field; inlet_mf. Error message; shaftchip-exec: inlet_mf: wrong return type: double udf function expectedchip-exec: ... Any suggestions please? Thanks in advance. #include "udf.h" DEFINE_PROFILE(inlet_mf,thread,i) { float t = CURRENT_TIME; face_t f; begin_f_loop(f, thread) { F_PROFILE(f,thread,i) = t*5; } end_f_loop(f,thread) }

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February 29, 2016, 17:21		#2
`e` Senior Member Join Date: Mar 2015 Posts: 892 Rep Power: 18	Are you using the moving/deforming mesh model? The DEFINE_PROFILE macro is for specifying a boundary condition such as a developed inlet velocity. Are you modelling the fan or are you simply altering the inlet conditions of a boundary face?