[wisawadol]

Hi everyone,

I'm using ANSYS FLUENT 12 to model a pitching airfoil. Sliding mesh and UDF are used to represent the movable airfoil. First, to test the interpreting working properly, I make my UDF as simple as possible BUT FLUENT shows some errors:

cpp -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/cortex/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/client/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/multiport/src" -I. -DUDF
ONFIG_H="<udfconfig.h>" "D:\v002\udftest02.c"
Error: D:\v002\udftest02.c: line 3: parse error.

My UDF is

#include "udf.h"

DEFINE_ZONE_MOTION(mymotion, omega, axis, origin, velocity, time, dtime)
{
*omega = 2500.0*time;
}

I run FLUENT 12 on Windows 7.

[DungPham]

Originally Posted by wisawadol

Hi everyone,

I'm using ANSYS FLUENT 12 to model a pitching airfoil. Sliding mesh and UDF are used to represent the movable airfoil. First, to test the interpreting working properly, I make my UDF as simple as possible BUT FLUENT shows some errors:

cpp -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/cortex/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/client/src" -I"C:\PROGRA~1\ANSYSI~1\v121\fluent\fluent12.1.2/multiport/src" -I. -DUDF
ONFIG_H="<udfconfig.h>" "D:\v002\udftest02.c"
Error: D:\v002\udftest02.c: line 3: parse error.

My UDF is

#include "udf.h"

DEFINE_ZONE_MOTION(mymotion, omega, axis, origin, velocity, time, dtime)
{
*omega = 2500.0*time;
}

I run FLUENT 12 on Windows 7.

With DEFINE_ZONE_MOTION you must specify a special rotational origin by using macros like the example below:

N3V_D (velocity,=,1.0,0.0,0.0);
N3V_S(origin,=,0.0);
N3V_D(axis,=,0.0,0.0,1.0);

But I think that better is you should manage the DEFINE_TRANSIENT_PROFILE macro. You just need to give a speed (rad/s) correspond to "Rotational Velocity" then directly put the "Rotation-Axis Origin" that located in the Mesh Motion tab

[zhereal]

please try 14.0
my udf :

#include "udf.h"
DEFINE_ZONE_MOTION(qqmotion,omega,axis,origin,velo city,time,dtime)
{
*omega =6.283185307;
N3V_D (velocity,=,10.0,0.0,0.0);
N3V_S(origin,=,0.0); /* default values, line could be omitted */
N3V_D(axis,=,0.0,0.0,1.0); /* default values, line could be omitted */

return;
}

i think my udf is similar to yours.
and it's right in my laptop.