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Old   June 29, 2010, 15:07
Question UDF for 2D gaussian distribution
  #1
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sunitha
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Hai,
I have written a code but im having problems with how to assign the absolute value.Can anyone tell me whats de mistake in my code? thank you

# include "udf.h"
# define v 10
# define delt .05
# define delx .5
# define I0 2*10000000
# define n 39
DEFINE_PROFILE(g_profile,t,i)
{
int x[ND_ND];
int j,k;
double xreg;
double xl[39],I[39],y[39];
face_t f;
/*xl= (v*delt)+(delx/2);*/
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y[0]=x[1];
for(j=1;j<=n;j++)
{
y[j]=(j-1)*delt;
/*k=j;*/
xl[j]=(j-1)*v*delt;
printf("%f\n",&xl[j]);
/*xreg=(y[j]-xl[j]);*/
double fabs(double (y[j]-xl[j]));
{
if ((y[j]-xl[j]) < 0)
xreg = -1*(y[j]-xl[j]);
else
xreg = (y[j]-xl[j]);
}
if(xreg<delx)
{
I[j]=I0*exp((-2*((xreg)*(xreg)))/(delx*delx));
}
else
{
I[j]=0;
}
printf( "%f\n", &I[j]);
}
}
end_f_loop(f,t)
}

when i try to interpret fluent is showing parse error at line where the fabs function is there...
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Old   June 29, 2010, 15:12
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You've missed an :

#include <math.h>
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Old   June 29, 2010, 15:16
Question
  #3
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sunitha
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Hai,
I have included #include "math.h" but this is still showing parse error at line 27..what should i change?
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Old   June 29, 2010, 16:52
Unhappy please solve my problem in udf
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sunitha
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when i am tring to compile i am getting this error....


Deleted old libudf\ntx86\2ddp\libudf.dll
1 file(s) copied.
1 file(s) copied.
(system "copy \speedy\sdsmtshare\NetApps\FLUENT.INC\fluent6.3.26 \src\makefile_nt.udf libudf\ntx86\2ddp\makefile")
1 file(s) copied.
(chdir "libudf")()
(chdir "ntx86\2ddp")()
'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.

what could be the mistake? please let me know
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Old   June 29, 2010, 19:43
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NOT #include "math.h" BUT

#include <math.h>

Also you should first try to interpret the UDF in order to be sure the C code is fine and after that you can try to compile the code .

Again use <> and not "" for math.h.

Do
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Old   June 29, 2010, 21:13
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Anyway it seems that you have a logical error in your code the line that gives you an error the one with fabs has no role in this code . If you erase (or comment) this line and leave the code as it is it will work.

Do

===============================

# include "udf.h"
# define v 10
# define delt .05
# define delx .5
# define I0 2*10000000
# define n 39
DEFINE_PROFILE(g_profile,t,i)
{
int x[ND_ND];
int j,k;
double xreg;
double xl[39],I[39],y[39];
face_t f;
/*xl= (v*delt)+(delx/2);*/
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y[0]=x[1];
for(j=1;j<=n;j++)
{
y[j]=(j-1)*delt;
/*k=j;*/
xl[j]=(j-1)*v*delt;
printf("%f\n",&xl[j]);
/*xreg=(y[j]-xl[j]);*/
/*double fabs(double (y[j]-xl[j]));*/
{
if ((y[j]-xl[j]) < 0)
xreg = -1*(y[j]-xl[j]);
else
xreg = (y[j]-xl[j]);
}
if(xreg<delx)
{
I[j]=I0*exp((-2*((xreg)*(xreg)))/(delx*delx));
}
else
{
I[j]=0;
}
printf( "%f\n", &I[j]);
}
}
end_f_loop(f,t)
}
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Old   June 30, 2010, 14:17
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sunitha
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Thank you.
I have tried like that and its getting interpreted its not showing any errors but when im trying to compile i am getting error like


1 file(s) copied.
1 file(s) copied.
(system "copy \speedy\sdsmtshare\NetApps\FLUENT.INC\fluent6.3.26 \src\makefile_nt.udf libudf\ntx86\2ddp\makefile")
1 file(s) copied.
(chdir "libudf")()
(chdir "ntx86\2ddp")()
'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.
"f:/projects/cml/lekkala_sunitha/project spring10/newmodelapril2010"
Opening library "libudf"...
Error: open_udf_library: The system cannot find the file specified.

Can you tell me why is this coming and could you plss suggest something about it??

Thank you
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Old   June 30, 2010, 15:54
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Do you have external compiler e.g. Microsoft Visual?
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Old   June 30, 2010, 16:28
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sunitha
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yes i do have microsoft visual studio.NET and im trying to open fluent through the command prompt..but still same error is coming up..
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Old   June 30, 2010, 17:30
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It compiles on my system, in both interpreted and compiled way. But after compiled could not find libudf library.

Try to reinstal visual studio, on wikicfd is a nice description how to do it. http://www.cfd-online.com/Wiki/Fluen...Fload_a_UDF.3F
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Old   June 30, 2010, 18:56
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sunitha
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Quote:
Originally Posted by Geisel View Post
It compiles on my system, in both interpreted and compiled way. But after compiled could not find libudf library.

Try to reinstal visual studio, on wikicfd is a nice description how to do it. http://www.cfd-online.com/Wiki/Fluen...Fload_a_UDF.3F
its working for me... i opened fluent through visual studio command prompt.. thank you so much for your help
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Old   July 7, 2010, 16:43
Default regarding results need help
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sunitha
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Quote:
Originally Posted by slek View Post
its working for me... i opened fluent through visual studio command prompt.. thank you so much for your help

Hai,

i have run de code but not getting de output correctly as i have written in code.donno y?? below is my code
# include "udf.h"
# define v 10 /* constants */
# define delt .1
# define delx .5
# define I0 2*10000000
# define n 10
DEFINE_PROFILE(g_profile,t,i)
{
int x[ND_ND];
int j;
double xreg;
double xl[1],I[1],y[1];
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
xl[1]=x[0];
y[1]=x[0];
for(j=1;j<=n;j++)
{
y[j]=(j-1)*delt;
xl[j]=(j-1)*v*delt;
{
if ((y[j]-xl[j]) < 0)
xreg = -1*(y[j]-xl[j]);
else
xreg = (y[j]-xl[j]);
}
if(xreg<=delx)
I[j]=I0*exp((-2*((xreg)*(xreg)))/(delx*delx));
else
I[j]=0;
/*F_PROFILE(f,t,i)= I[j];*/
printf( "%i\n", j);
printf( "%f\n", I[j]);
}
}
end_f_loop(f,t)
}

thanks

please suggest me what could be wrong??
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