Learning Forum

[tayyubqayyum0]

[Karthik Remella]

Hello When you launch Fluent, try running it with 0 processors to launch Fluent with a -t0 flag. Please note that this does not work for the recent versions of Fluent there is no serial -t0 launch available. If you are running into this issue, I'd recommend that you work on parallelizing your UDF.
Thanks.
Karthik

[tayyubqayyum0]

#include"C:\ProgramFiles\ANSYSInc\v191\fluent\fluent19.1.0\src\udf\udf.h"
#include"C:\ProgramFiles\ANSYSInc\v191\fluent\fluent19.1.0\src\mesh\dynamesh_tools.h"
#include"C:\ProgramFiles\ANSYSInc\v191\fluent\fluent19.1.0\src\pbns\unsteady.h"

staticrealv_prev;/*velocityinprevioustimestep*/

DEFINE_SDOF_PROPERTIES(stage,prop,dt,time,dtime)
{
Thread*t;
Domain*d=Get_Domain(12);

realcg_y;/*centreofgravitypositiony*/
realcg_x;/*centreofgravitypositionx*/
realvel_y;/*cylindervelocityy*/
realvel_x;/*cylindervelocityx*/
realFy;/*Liftforce*/
realFx;/*Dragforce*/

realmr=10;/*cylindermassratio*/
realrho=998.2;/*FluidDensity*/
realfn=4.1302676;/*systemfrequency*/
realdia=0.002;/*cylinderdiameter*/
realz=0;/*Dampingcoefficient*/
realcm=1;/*addedmasscoefficient*/

realmass=(mr*rho*dia*dia*M_PI)/4;/*Cylindermass*/
realwn=2*M_PI*fn;/*systemangularvelocity*/
realky=mass*wn*wn;/*Systemstiffnessy*/
realkx=mass*wn*wn;/*Systemstiffnessx*/
realcy=2*mass*wn*z;/*Systemdampingy*/
realcx=2*mass*wn*z;/*Systemdamping*/

/*getthethreadpointerforwhichthismotionisdefined*/
t=DT_THREAD(dt);

prop[SDOF_MASS]=mass;/*systemmassofthe6dof*/
prop[SDOF_IXX]=(mass*dia*dia)/16;
prop[SDOF_IYY]=(mass*dia*dia)/16;
prop[SDOF_IZZ]=(mass*dia*dia)/8;

/*limit4dofsfrom6dofmacro*/
prop[SDOF_ZERO_TRANS_X]=FALSE;
prop[SDOF_ZERO_TRANS_Y]=FALSE;
prop[SDOF_ZERO_TRANS_Z]=TRUE;
prop[SDOF_ZERO_ROT_X]=TRUE;
prop[SDOF_ZERO_ROT_Y]=TRUE;
prop[SDOF_ZERO_ROT_Z]=TRUE;

cg_y=DT_CG(dt)[1];
cg_x=DT_CG(dt)[0];
vel_y=DT_VEL_CG(dt)[1];
vel_x=DT_VEL_CG(dt)[0];
Fy=-ky*cg_y-vel_y*cy;
Fx=-kx*cg_x-vel_x*cx;

prop[SDOF_LOAD_F_Y]=Fy;
prop[SDOF_LOAD_F_X]=Fx;
}
can anyone change this for parallel processes ?

[Karthik Remella]

Hello Sorry, we will not be able to help you with writing/scripting the UDF in parallel. Please go through the following documentation to parallelize this UDF. Here is the link from our Fluent Customization manual.
Having said that, if you have any questions related to a macro, we can certainly help here.
Thank you.
Karthik

[YasserSelima]

It doesn't require any modification to run in parallel. But are you sure of Get_Domain(12) ??

[YasserSelima]

Your problem is not in parallelizing the UDF. it is something in the setting. "nmake" is not recognized .. the file is not compiled, neither for serial or parallel ...

[tayyubqayyum0]

Thanks for help it's okay now

[YasserSelima]

you are welcome!