# connecting two lines

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 June 14, 2013, 21:09 connecting two lines #1 New Member   Mahboobe Mahdavi Join Date: Mar 2013 Posts: 22 Rep Power: 6 Sponsored Links dear all, I wan to write udf to connect to lines together. I am going to define the temperature of line one equals to temperature of line two. one of the line belongs to the solid parts and the other belongs to fluid part. I can not use form new part, since I want to define line two as velocity inlet. can any one help me please?

 June 15, 2013, 13:48 Could not undrestand the problem #2 New Member   Pouria Join Date: Jan 2012 Location: U.S Posts: 9 Rep Power: 7 Hi, I could not fully understand what the problem is. Can you provide some image here and explain the problem based on that? Thank you. Pouria

June 15, 2013, 17:41
image
#3
New Member

Mahboobe Mahdavi
Join Date: Mar 2013
Posts: 22
Rep Power: 6
I have uploaded the picture. I should add this point that I have created the geometries in design modeler . so I have two bodies and in fact I have two lines for the interface. I am set the temperature of these lines equal. I have written the udf for boundary condition. As a test I have defined a linear temperature for the line belongs to vapor chamber(lets call it inlet) and write another udf for the line belongs to the solid(wall) in order to set its temperature equals to the inlet, but the temperatures will not be exactly equal
Attached Images
 Untitled.png (4.8 KB, 11 views)

 June 15, 2013, 18:05 #4 New Member   Pouria Join Date: Jan 2012 Location: U.S Posts: 9 Rep Power: 7 The other thing you can try is to use a DEFINE-ADJUST macro to calculate the temperature at the inlet (or wall) at the beginning of each iteration. Then you can pass the calculated temperature to DEFINE_PROFILE macro to set the temperature at the Wall (or Inlet). Thank you. Pouria.

June 15, 2013, 18:17
#5
New Member

Mahboobe Mahdavi
Join Date: Mar 2013
Posts: 22
Rep Power: 6
thank you very much. My udf for the inlet is :
DEFINE_PROFILE(tempif_profile,t,i)
{

real x[ND_ND],d[10000];
face_t f;
int k;

real hfg=4237.;

Domain*d1 = Get_Domain(1);
int IDif=13;
cell_t c;

begin_f_loop(f,t)
{

F_PROFILE(f,t,i) =1./( 1./818-(.361/hfg)*log(((F_P(f,t)+1300.))/1300.));

end_f_loop(f,t)

and for the solid wall is:
DEFINE_PROFILE(tempis_profile,t,i)
{

real x[ND_ND]; double d[10000];
face_t f,f1;
int k,N;

int IDif=13;
int IDis=14;
Domain*d1 = Get_Domain(1);
k=-1;

begin_f_loop(f,tfif)
{

k=k+1;
d[k]=F_T(f,tfif);

}
end_f_loop(f,tfif)
N=k;
k=-1;
begin_f_loop(f,t)
{
k=k+1;

F_PROFILE(f,t,i) =d[N-k];

}
end_f_loop(f,t)

}

}

the main problem is that without defining array d , my trend would be switched . I mean for example if my temperature for inlet is T=10*x
then the resulting temperature for solid would be T=10*(L-x)!
Even by defining array d and sorting the array , some points will be switched like the picture attached to this comment, Do you think by using adjusting macros this problem will be solved? I also have to use these two tempretures to obtain heat fluxes and calculate the velocity for inlet.
Attached Images
 1.png (7.2 KB, 3 views)

 June 17, 2013, 11:28 #6 New Member   Mahboobe Mahdavi Join Date: Mar 2013 Posts: 22 Rep Power: 6 Hi again, I have no idea how to use DEFINE-ADJUST macro, would you please help meee?

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