[wiki123]

Hello everyone.

I am new to UDF programming and working on a multiphase problem. I have a questions as follows. I shall be highly thankful for any response.

I am using a DEFINE_ INIT function and want to access a mixture thread/super thread pointer for a multiphase problem. UDF manual provides a lookup_thread macro with two arguments of domain and ID to access the thread pointer. Also, it states that ANSYS fluent will automatically pass mixture domain pointer argument for lookup_thread if it is operating inside DEFINE_INIT. But I am confused how to get the int ID. It will be for a mixture thread. Where to find it?

In boundary conditions dialog box or phases dialog box?

Any help shall be highly appreciated.

Thanks in advance.

Best regards.

[AlexanderZ]

In boundary conditions dialog box

this is ID of mixture thread

to get the thread of phases you can try to use

int phase_domain_index = 0; /* primary phase index is 0 */
Thread *mixture_thread; /* mixture-level thread pointer */
Thread *subthread = THREAD_SUB_THREAD(mixture_thread,phase_domain_index);

[wiki123]

Thank you dear Alexander for your reponse.

As you mentioned about accessing the sub thread pointer, can we also access it using the pointer array?

I read this in the manual but I dont know whether I understand it correctly or not.

thread *sub_thread_pointer= pt[i]; /* pt[0] or pt[1] for primary or secondary*/

Thank you for your time.

Best regards

[AlexanderZ]

as far as I understand, yes

/* pt[0] , pt[1] are for primary , secondary*/