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Using a C_UDMI defined in one UDF in another UDF

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Old   March 30, 2018, 18:23
Default Using a C_UDMI defined in one UDF in another UDF
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Matt
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I use a C_UDMI to calculate the number of particles that deposit on a wall as:

DEFINE_DPM_BC(Deposition,p,t,f,f_normal,dim)
{
#if !RP_HOST
Thread *tcell=P_CELL_THREAD(p);
cell_t c=P_CELL(p);
Domain *d;
d=Get_Domain(1);
C_UDMI(c,tcell,0) += 1.;
return PATH_ABORT;
#endif
}

Then, I want to use this C_UDMI in another UDF to move the mesh where particles are deposited:

DEFINE_GRID_MOTION(beam,domain,dt,time,dtime)
{
Thread *tf;
face_t f;
int n;
Node *v;
/* get the thread pointer for which this motion is defined */
tf=DT_THREAD(dt);
begin_f_loop(f,tf)
{
f_node_loop(f,tf,n)
{
v = F_NODE(f,tf,n);
......
......C_UDMI.......
......
}
}
end_f_loop(f,tf);
}



Is this possible? Can anyone help how to do this?

Thanks,

Last edited by sthinmind; March 31, 2018 at 12:10.
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Old   March 31, 2018, 02:18
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Doruk Yelkenci
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real G;
G=C_UDMI(c,t,0); will allow you to use it on another define macro

but above you are trying to use cell data in face node loop. You cant transfer data like that
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Old   March 31, 2018, 10:36
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Matt
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Thanks for your response. So does G have all information that C_UDMI has?(cell information and stored values)
Do I need to define G in the second UDF as well? Something like:

DEFINE_GRID_MOTION(beam,domain,dt,time,dtime)
{
Thread *tf;
face_t f;
int n;
Real G

....
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Old   March 31, 2018, 11:45
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Quote:
Originally Posted by sthinmind View Post
I use a C_UDMI to calculate the number of particles that deposit on a wall as:

DEFINE_DPM_BC(OSU_Deposition_Model_R1,p,t,f,f_norm al,dim)
{
#if !RP_HOST
Thread *tcell=P_CELL_THREAD(p);
cell_t c=P_CELL(p);
Domain *d;
d=Get_Domain(1);
C_UDMI(c,tcell,0) += 1.;
return PATH_ABORT;
#endif
}

Then, I want to use this C_UDMI in another UDF to move the mesh where particles are deposited:

DEFINE_GRID_MOTION(beam,domain,dt,time,dtime)
{
Thread *tf;
face_t f;
int n;
Node *v;
/* get the thread pointer for which this motion is defined */
tf=DT_THREAD(dt);
begin_f_loop(f,tf)
{
f_node_loop(f,tf,n)
{
v = F_NODE(f,tf,n);
......
......C_UDMI.......
......
}
}
end_f_loop(f,tf);
}



Is this possible? Can anyone help how to do this?

Thanks,
Yes, it is possible. It is even simpler than your code.

In your UDF "OSU_Deposition_Model_R1", you now store face data in a C_UDMI, by first finding the associated cell. You can skip that step, and directly store it in F_UDMI(f,t).

Code:
DEFINE_DPM_BC(OSU_Deposition_Model_R1,p,t,f,f_normal,dim)
{
#if !RP_HOST
F_UDMI(f,t,0) += 1.; 
return PATH_ABORT;
#endif	
}
And in your other code, you can simply extract the data with F_UDMI(tf,t).
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Old   April 1, 2018, 20:20
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Matt
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Thanks for your response.

I guess I need the nodal values in DEFINE_GRID_MOTION to move the mesh? How do I store the same value (F_UDMI) in the neighboring nodes? How do I find the nodes around a the face f? (In 2D there are two nodes at two sides of the face)
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