[pianaCFD]

Hello UDF experts,

I'm trying to parallelize my code. In my code there are loop over cells. In the UDF manual there is written hat the loop over cells have to be inside the #IF !RP_HOST and if I want to have a loop all over the cells I have to use the begin_c_loop_int_ext.
The software is running in this way but if I print the IDs of the cells in the loop it is showing less values (1/5 if I'm using 5 cores).
I've red the manual, but I can't really figure out how to do it properly.

Any suggestion? Any advice would be appreciated.
Thanks

[AlexanderZ]

there is no begin_c_loop_int_ext macro but begin_c_loop_int or begin_c_loop_ext

how do you print ID's of cells? is it possible that fluent divide domain on 5 parts and count cells separately?

best regards

[pianaCFD]

Thank you for your answer,

in the UDF guide it is written that begin_c_loop_int_ext can be used. It is also compiling, so I think it exists.

This is exactly the problem. I have 5 processors, fluent is dividing the domain in 5 parts and it is taking the variables only from the first part. I'm printing with Messege0("%f", variable). Is there a way to connect all the parts or is there a way according to you to loop all over the cells? The begin_c_loop_int_ext, if exists, is not not working in this way.

Thank you

[AlexanderZ]

Message0 will send messages from compute
node-0 only and is ignored on the other compute nodes, without having to use a compiler directive.

use Message to get output from all nodes

use begin_c_loop to loop over all cell/threads

best regards

[pianaCFD]

Okay, the begin_c_loop seems working properly, but Message is giving back a mess... it is printing something that has no sense, but after the begin_c_loop also Message0 seems better.

Thank you

[Wang Changjun]

Originally Posted by pianaCFD

Thank you for your answer,

in the UDF guide it is written that begin_c_loop_int_ext can be used. It is also compiling, so I think it exists.

This is exactly the problem. I have 5 processors, fluent is dividing the domain in 5 parts and it is taking the variables only from the first part. I'm printing with Messege0("%f", variable). Is there a way to connect all the parts or is there a way according to you to loop all over the cells? The begin_c_loop_int_ext, if exists, is not not working in this way.

Thank you

Hi,

Did you solve your problem?