mesh morpher/optimizer
 

Hi every body.
I have a problem with my UDF for defining the objective function for design optimization of an airfoil. Here is my UDF:

#include"udf.h"
#include"dynamesh_tools.h"
#include"morpher.h"
# define ZONEID 3
DEFINE_ON_DEMAND(objective_function)
{
real x_cg[2];
real f_glob[2];
real m_glob[2];
real drag=0.0;
Domain *domain;
Thread *thread;
domain=Get_Domain(1);
thread = Lookup_Thread(domain,ZONEID);
x_cg[0] = 0;
Compute_Force_And_Moment(domain,thread,x_cg,f_glob ,m_glob,TRUE);
drag=f_glob[0]*0.9962+f_glob[1]*0.08716;
RP_Set_Real("morpher/objective_function",drag);
}

It is compiled successfully but when I check it through execute on demand or when I use it in the optimization, I receive this error message:

Error: rp-var-value-local-set!: undefined variable
Error Object: morpher/objective_function

I use win 64 bit and Visual Stodio 2010 and Fluent 13. I would be happy if anybody can help me with this problem.

http://www.cfd-online.com/Forums/newreply.php?do=newreply&noquote=1&p=333824#
 

Execute following command before loading your own UDF.

Thank you so much but it still doesnt work!:confused:

Thank you so much but it still doesnt work!:confused:

The rpvar name is wrong.

Thank you so much for your help. It is working now!;)

Hi all
I think you people are very good with optimization
I am also trying to optimize the shape of chemical reactor. I have some basic questions
1) what is the meaning of parameters in the optimizer windows??
2) how can we set their max and minimum values?
3) I am solving 2D axisymmetic flow through a pipe" with a chemical reaction taking place inside it" and i want to optimize the shape of that pipe"optimized shape would be something like combination of nozzle diffuser type" should I define the optimization region over the whole axisymmetric domain or just on the area close to the wall.
4) i leant from the blog that people are interfacing matlab with fluent to do geometric optimization, I want to know why they are not using these biult in optimizer. of course there are certain limitation can you please give a take of that??
5) finally some idea of how to link matlab with fluent
Thanks in advance for your rime and concern
Ibrar

Dear scsasha

Could you tell us How many control points you have considered around the airfoil?

Thanks