[scsasha]

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.

[fox000002]

Execute following command before loading your own UDF.

/define/enable-mesh-morpher-optimizer? yes

[scsasha]

Originally Posted by fox000002

Execute following command before loading your own UDF.

/define/enable-mesh-morpher-optimizer? yes

Thank you so much but it still doesnt work!

[scsasha]

Thank you so much but it still doesnt work!

[fox000002]

The rpvar name is wrong.

RP_Set_Real("morpher/objective-function",drag);

[scsasha]

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

[Ibrar]

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

[syavash]

Originally Posted by scsasha

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.

Dear scsasha

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

Thanks