[wanghaojie]

Dear all,

does anyone know how to execute a udf after convergence for steady state case. I find execute_at_end can only execute after one iteration.

[mali28]

Originally Posted by wanghaojie

Dear all,

does anyone know how to execute a udf after convergence for steady state case. I find execute_at_end can only execute after one iteration.

You can use:

DEFINE ON DEMAND()

See the Fluent manual for details.

[ComputerGuy]

Wanghaojie,

If you're only looking to execute the code once, mali28's suggestion is correct. Have a look here: http://www.cfd-online.com/Forums/flu...ed-memory.html for a UDF which will run the macro ONLY IF time> a value you specify.

However, if you're looking to run a macro at every timestep/iteration beyond a certain point, I recommend using the DEFINE_ADJUST macro, which will continue to run automatically, as opposed to only running once, per mali28's suggestion.

ComputerGuy

Originally Posted by wanghaojie

Dear all,

does anyone know how to execute a udf after convergence for steady state case. I find execute_at_end can only execute after one iteration.

[djing]

I want to start an unsteady calculation in FLUENT , I use an unsteady velocity profile to the INLET, and An unsteady pressure to the outlet
the problem is that I could not run both UDF at the same time as boundary conditions of my problem
please help me as soon as possible
cordially

[ComputerGuy]

You should be able to define two separate define_profile functions with different names. Then, in fluent, you'll need to hook the appropriate functions to your boundaries. Let us know if you're still having problems with this. If you want the code written, write down your equations for each (velocity and pressure) with time, and I'll send you the code.

ComputerGuy

Originally Posted by djing

I want to start an unsteady calculation in FLUENT , I use an unsteady velocity profile to the INLET, and An unsteady pressure to the outlet
the problem is that I could not run both UDF at the same time as boundary conditions of my problem
please help me as soon as possible
cordially

[vidyadhar]

Originally Posted by ComputerGuy

Wanghaojie,

If you're only looking to execute the code once, mali28's suggestion is correct. Have a look here: http://www.cfd-online.com/Forums/flu...ed-memory.html for a UDF which will run the macro ONLY IF time> a value you specify.

However, if you're looking to run a macro at every timestep/iteration beyond a certain point, I recommend using the DEFINE_ADJUST macro, which will continue to run automatically, as opposed to only running once, per mali28's suggestion.

ComputerGuy

Hello ComputerGuy,


I am running a transient simulation.
Is there a way to execute DEFINE_ADJUST after achieving convergence in every timestep. I want to determine the gradient of volume fraction of secondary phase in this macro and store in a UDM to use later.

Solution is converging between 5 to 15 iterations in each time step.




Thanks & Regards,
Vidyadhar

[AlexanderZ]

use DEFINE_EXECUTE_AT_END instead of DEFINE_ADJUST

best regards