[p36288]

How to do Design Optimization in Fluent 13.0?
Anyone noticed that the latest version ANSYS 13.0 FLUENT solver have integrated Automatic shape flow optimization? I'm trying to do a simple optimization case, however, the objective function can only be provided in one of two ways: either as a UDF, or as a Scheme source file. Here are what the UserGuide said on the definition of objective function:
"
A. If you want to provide the objective function as a user-defined function (UDF), perform the steps that follow.
1. Write a UDF using the DEFINE_ON_DEMAND macro to define the objective function. The function name must be objective_function. At the end of the objective function, the rpvar morpher/objective_function needs to be set to the (current - target) value. It is this value that the optimizer will attempt to minimize.
2. Compile the UDF using the Compiled UDFs dialog box. Make sure libudf appears as the Library Name. Define User-Defined Functions Compiled...

B.If you want to provide the objective function as a Scheme source file, perform the following steps:
1. Write a Scheme source file to define the objective function. The procedure name must be objective-function. At the end of the objective function, the rpvar morpher/objective-function needs to be set to the (current - target) value. It is this value that the optimizer will attempt to minimize.
2. Load the Scheme source file.
"
After reading the guide, i'm still not clear how to define the objective function. Anyone could provide me an example about how to do it?
Thanks a lot.

[fox000002]

1 UDF

#include "udf.h"
 
DEFINE_ON_DEMAND(objective_function)
{
    real obj = 0.0;
    /* ... */
    rp_set_real(morpher/objective_function, obj); 
}

2 Scheme

(define (objective-function)
;...
  (rpsetvar 'morpher/objective_function obj)
)