[ram_call]

Hi everyone,
I am trying to simulate rotation of an impeller around X axis (1DOF). I've wrote this UDF, but error for compiling is as below:
[Error] udf.h: No such file or directory

UDF:
#include "udf.h"
DEFINE_SDOF_PROPERTIES(turbine,prop,dt,time,dtime)
{
prop[SDOF_IXX]=0.0001969261;
prop[SDOF_ZERO_TRANS_X]=TRUE;
prop[SDOF_ZERO_TRANS_Y]=TRUE;
prop[SDOF_ZERO_TRANS_Z]=TRUE;
prop[SDOF_ZERO_ROT_X]=FALSE;
prop[SDOF_ZERO_ROT_Y]=TRUE;
prop[SDOF_ZERO_ROT_Z]=TRUE;
printf("\nturbine: updated 6DOF properties");
}

what is the error?
1) is the UDF correct? I think for rotation mass is not necessary, is it? also defining other moments, presumably fluent will consider zero, right?
2) Are units in SI for UDF? the units for IXX is assumed kg.m2 (SI)
3) I defined the rotation axis X, does it mean it will be the axis of rotation?
4) how fluent can understand it is CW or CCW rotation? in Ansys 18 (no need to UDF for this kind of problem) I could define -1 along X for axis of rotation, which I think it defined the direction.
Any experience?

[ram_call]

maybe I dont know how to comoile a UDF at the first place, i am new on UDF

[AlexanderZ]

It seems, you have installed fluent using not default setting.
I think, the problem is that fluent doesn't see his files for udf.

To fix this issue you may try to set windows environment variable FLUENT_INC
and put there your path to fluent (by default C:\ANSYS Inc\v182\fluent )

Best regards

[AlexanderZ]

do not forget to reboot your computer

[ram_call]

Originally Posted by AlexanderZ

It seems, you have installed fluent using not default setting.
I think, the problem is that fluent doesn't see his files for udf.

To fix this issue you may try to set windows environment variable FLUENT_INC
and put there your path to fluent (by default C:\ANSYS Inc\v182\fluent )

Best regards

thanks for answer. I installed visual basic and after first attempt, seems fluent recognized it for compiler automatically. It seems recent versions (18 for my case) can do it, but for older need settings you mentioned.

[ram_call]

Originally Posted by AlexanderZ

do not forget to reboot your computer

do you know about question 4? should I enter negative value for Ixx for correct rotation direction or no difference for that and domain will rotate based on flow regime and forces coming by.
also my geometry is in mm, but I entered value for mass and moment of inertia in m and kg.m2. I hope this is true since I read in manual that the default units are SI.