[umeralizuberi]

i have to simulate a flapping motion in ansys but the udf is not loading
i have a code for flapping motion in 2D can you check it, i can not find any error in it.
/* the code is written for 2D flapping chord length of 0.01 m
and Reynolds number of 157 i.e velocity = 0.229 m/s
*/

#include "udf.h"

static real alpha_dot = 0.0; /* rotational velocity */
static real x_velocity = 0.0; /* velocity in X direction */
static real y_velocity = 0.0; /* velocity in Y direction*/

DEFINE_CG_MOTION(flapping, dt, vel, omega, time, dtime)
{

Thread *t;
face_t f;
real pi = 3.14159;
real c = 0.01; /* wing chord in meters */
real amp = 0.025; /* Amplitude in meters */
real period= 0.025; /* time period in second */
real alpha; /* angle of attack */

real beta = (pi/3); /* inclination angle of stroke plane */



/*reset velocities*/
NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);

if (!Data_Valid_P ())
return;


x_velocity= -(amp*pi/(period))*cos(beta)*sin(2*pi*time/period);
y_velocity= -(amp*pi/(period))*sin(beta)*sin(2*pi*time/period);
alpha = (pi/4)-((pi/4)*sin(2*pi*time/period));
alpha_dot = -((pi/4)*2*pi/(period))*cos(2*pi*time/period);


Message("time:%f alpha:%f alpha_dot:%f x_velocity:%f y_velocity:%f\n",time,alpha,alpha_dot,x_velocity, y_velocity);


vel[0] = (x_velocity);
vel[1] = (y_velocity);
omega[2]= -(alpha_dot);

}
(whenever i click on build there is a msg i.e.
(chdir "libudf")(chdir "win64\2ddp") 'nmake' is not recognized as an internal or external command, operable program or batch file.)
after this if i load it gives the error i.e.
The UDF library you are trying to load is not compiled for 2ddp on the current platform (win64)

kindly help me.

[pakk]

The nmake error is the crucial part: your Fluent is not properly installed/configured, and now Fluent can not find a compiler. It has nothing to do with your code.

Search for the nmake error on this forum, there are explanations on how to install the compiler for fluent.

[umeralizuberi]

i have opened the fluent from command prompt (not directly ) but still it is same, i am using ansys 16 and VS 17 should i reinstall ansys/fluent?

[umeralizuberi]

there is a method written there which say that i have to set the PATH by writing the location of nmake from the directory but i can not find the nmake location, it doesnt exist

[pakk]

As I said, look for that error on this forum. You need a compiler. There are good explanations, all there for details. I never installed it, so I can't help much.

[umeralizuberi]

followed all the steps for changing of udf.bat file also i have placed the nmake PATH
but now i am getting error i.e. fatal error C1083

[umeralizuberi]

ok thank you so much