[alilouu]

hi; I work on the hydrodynamic transient problem using an udf .
when I use an ordinary PC, the udf is compiled, but when i use a work station, or an other pc work with 64 bits, and after :
adding the udf
building the library udf
loadin this librudf, i ve got alwas this message

error opening library udf: the path is not found

what have i to do to compile this udf???

[Nikolopoulos]

You should recomplile your udf every time you change OS and every time you change from 32 to 64.

[mecamor]

hello
I wrote the UDF of the piston, but when compiling with C 13 or it Fluent There's an error in line 3. How I should do. thank you
Error: C:\Program Files\ANSYS Inc\v130\fluent\ntbin\win64\PISTON2.c: line 3: parse error.

How I should do. thank you
#include "udf.h"
#include "dynamesh_tools.h"
static real v_prev= 0.0;
DEFINE_CG_MOTION(piston, dt, vel, omega, time, dtime)
{
Thread *t;
face_t f;
real NV_VEC (A);
real force, dv;
/* reset velocities */
NV_S (vel, =, 0.0);
NV_S (omega, =, 0.0);
if (!Data_Valid_P ())
return;
/* get the thread pointer for which this motion is defined */
t = DT_THREAD ((Dynamic_Thread *)dt);
/* compute pressure force on body by looping through all faces */
force = 0.0;
begin_f_loop (f, t)
{
F_AREA (A, f, t);
force += F_P (f, t) * NV_MAG (A);
}
end_f_loop (f, t)
/* compute change in velocity, i.e., dv= F * dt/ mass;
velocity update using explicit eulerformula */
dv= dtime* force / 50.0;
v_prev+= dv;
CX_Message ("time = %f, x_vel= %f, force = %f\n", time, v_prev, force);
/* set x-component of velocity */
vel[0] = v_prev;
}

[Nikolopoulos]

Your UDF has no problem. I can compile it with no error!

What OS are you using?

If you wrote your .c file in Windows and you compile it in Unix use the
dos2unix command

[alilouu]

hi Nikolopoulos Aristeidis

thanks for your help,
I didn't understand your idea about compiling every time I change OS, or from 32 to 64 bits. do I compile the udf when I load It by fluent (whitch failed every time) or using the compiling programm in c++ langage
thnks a lot.

[Nikolopoulos]

If you built your libudf in windows 32 and then move your case file and libudf in Linux or in windows 64 your libudf will not load. You should rebuilt it.

If you did that the problem is something else. Your code is compiling in my PC.

Your workstation is working with Linux?
If yes try the dos2unix command for your .c file before building your libudf

[Nikolopoulos]

Post here what fluent writes when you build your UDF

[alilouu]

hi my freind; here is the message after LOADING the udf:

"The UDF library you are trying to load (libudf) is not compiled for 3d on the curent platform (win64).
The system cannot find the file specified.

c:\users\administrator\desktop\udf ali\libudf\win64\3d\libudf.dll "



and my udf :I use win 64 bits.

#include <stdio.h>
#include "udf.h"

/* Definition du nom du fichier où sont stockées les données */
# define UDF_FILENAME "udf_donnees.dat"

/* Début de la soubroutine de déformation de paroi */
DEFINE_GRID_MOTION(cylindre, domain, dt, time, dtime)
{
/* définition des variables : x_coor (coordonnée suivant l'axe x)
x_centre (coordonnée selon x du centre du cylindre)
y_coor (coordonnée suivant l'axe y)
y_centre (coordonnée selon y du centre du cylindre)
rayon (rayon actuel du cylindre)
freq (fréquence de déformation)
alpha (Amplitude de déformation)
temps */
Thread *tf = DT_THREAD (dt);
face_t f;
Node *v;
real x_coor;
real x_centre;
real y_coor;
real y_centre;
real rayon;
real freq;
real alpha;
real temps;
real tempss;
real corec;
int i;
int j;

int n;
FILE *fp = fopen(UDF_FILENAME, "r");

/* set deforming flag on adjacent cell zone */
SET_DEFORMING_THREAD_FLAG (THREAD_T0 (tf));


fscanf(fp,"%e %e %e %e %e", &x_centre, &y_centre, &rayon, &freq, &alpha);

fclose (fp);
corec=1;

temps = RP_Get_Real("flow-time");

if(temps>0){corec=corec*(1+ABS((alpha)*sin(2*M_PI* freq*(temps-0.0002))));}



begin_f_loop (f, tf)
{


f_node_loop (f, tf, n)
{
v = F_NODE (f, tf, n);
if (NODE_POS_NEED_UPDATE (v))
{
NODE_POS_UPDATED (v);


//rayon = sqrt(NODE_X (v)*NODE_X (v)+NODE_Y (v)*NODE_Y (v));
x_coor = (NODE_X (v)-x_centre)/rayon;
y_coor = (NODE_Y (v)-y_centre)/rayon;
NODE_X (v) = (rayon*(1+ABS(((alpha)*sin(2*M_PI*freq*temps))))*x _coor)/corec;
NODE_Y (v) = (rayon*(1+ABS(((alpha)*sin(2*M_PI*freq*temps))))*y _coor)/corec;

}
}

}
end_f_loop (f, tf);
}

[Nikolopoulos]

"The UDF library you are trying to load (libudf) is not compiled for 3d on the curent platform (win64).
The system cannot find the file specified.

c:\users\administrator\desktop\udf ali\libudf\win64\3d\libudf.dll "

After getting this message , unload any UDF in your CASE file and built again your libudf. When you press the button for Building fluent writes down how the building (compilation) went. Post this message here.

[alilouu]

after re-building without reloading the udf, this is the message


" Deleted old libudf\win64\3d\libudf.dll
1 file(s) copied.
(system "copy "\SERVER\C$\PROGRA~1\ANSYSI~1\v130\fluent"\fluent1 3.0.0\src\makefile_nt.udf "libudf\win64\3d\makefile" ")
1 file(s) copied.
(chdir "libudf")()
(chdir "win64\3d")()
'nmake' is not recognized as an internal or external command,
operable program or batch file.
'nmake' is not recognized as an internal or external command,
operable program or batch file.

Done.

[Nikolopoulos]

Ok! Now i know what the problem is.

You don't have a compiler or the environmental variables are not properly set in order to fluent use this compiler.

You have win 64?
Do you have visual studio installed?
If yes check the environmental variables (if you have a fluent launcher just check the envirnmental variables from there).

Alternatively open a visual studio 64 bit command prompt and launch fluent from there with a text command

[alilouu]

Thank you my friend, by using the fluent launcher, I think I solved the problem, bravo.


there is an other question if you don't minde;
I want to track some particules to fellow their path, pressure, velocity...
i've been told to use DPM, but I failed.
how to use dpm, and how to get the results.?

P.s: sorry for my boring questions, realy I need to learn.

[Nikolopoulos]

For dpm use the -> Model -> Discrete model and set up your injection.

It is not dfficult just find a fluent tutorial.

[mecamor]

hello
I work with windows 7. how to build the library udf. and when I compile my udf fluent that he lacks nmake.

[Nikolopoulos]

mecamor you have the same problem as ali.

Do you have Visual studio installed?

[mecamor]

Originally Posted by Nikolopoulos

mecamor you have the same problem as ali.

Do you have Visual studio installed?

dear friend
I installed Microsoft Visual C + + 2010 Express.

[alilouu]

Thank you very much my friend Nikolopoulos Aristeidis, I found what I need.

Ali.