Hi, all

What is the Thread in Fluent for DSW? It is a boundary or interior face? I need some info about these for UDF? Thanks

You can verify doing a loop over all boundary threads and check the tread id.

thread_loop_f(tf,domain) /*loop over all face's threads in a domain*/ { if(BOUNDARY_FACE_THREAD_P(tf)) /*check if is a boundary thread*/ printf("\n %d \n",(tf)->id); }

Thank you, Doru Grosan

your acessment is right, I believe.There two domain in my case(a solid one and fluid one).The double side wall exits. Whether the C0 and C1 cell of the DSW exist? If I add a energy source in the fliud zone, how can I do these?

Thanks to anyone who can help

If a side of the wall is a boundary then c0 will be the cell inside the domain and c1 will be -1. This should be valid for the solid domain (the adjacent boundary to the solid) and also for the fluid domain (the adjacent boundary of the fluid).

To add a source term for fluid, in the boundary condition panel you have to chose the fluid zone and set the source (see Fluent manual pp. 6-88 and pp. 6-186).

Thank you!

whether (th)->id can be used in UDF? I want to choose one boundary face which I already know its ID.(use a loop over all boundary faces)

When you are looping over threads you can find the id of the thread using (thread)->id. When you know the id of the boundary you have this possibility:

int wall=3; /*3 is the id of the boundary*/ Thread *t_wall=Lookup_Thread(domain,wall); /*find the pointer to the thread*/ begin_f_loop(f,t_wall)

{ ....

} end_f_loop(f,t_wall); /*loop over thread faces*/

see UDF Manual page 6-16.