CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

UDS Flux

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 3, 2008, 05:25
Default UDS Flux
  #1
Thiru
Guest
 
Posts: n/a
Hello friends, I am using 4 User defined scalars in my simulation. I want to use user-defined scalar flux term. The following code which I found in the Fluent manual compiled fine but it is giving me error when I started simulation.

"Error: fluent.6.3.26 received a fatal signal (SEGMENTATION VIOLATION). Error Object: #f "

This UDS Flux function returns the mass flow rate to the UDS. Can any one please suggest me where is the problem.

DEFINE_UDS_FLUX(my_uds_flux, f, t, i) { Thread *t0, *t1 = NULL; cell_t c0, c1 = -1;

real NV_VEC(psi_vec), NV_VEC(A);

/* neighboring cells of face f, and their (corresponding) threads */

t0 = F_C0_THREAD(f,t); c0 = F_C0(f,t);

if (NULL != F_C1_THREAD(f,t)) /* Alternative: if (! BOUNDARY_FACE_THREAD_P(t)) */

{

t1 = F_C1_THREAD(f,t);

c1 = F_C1(f,t);

} else

{

t1 = NULL;

c1 = -1;

}

/* If Face lies at domain boundary, use face values; */ /* If Face lies IN the domain, use average of adjacent cells. */

if (NULL == t1) /* Alternative: if (BOUNDARY_FACE_THREAD_P(t)) */

{

NV_D(psi_vec, =, F_U(f,t), F_V(f,t), F_W(f,t));

NV_S(psi_vec, *=, F_R(f,t));

} else

{

NV_D(psi_vec, =, C_U(c0,t0), C_V(c0,t0), C_W(c0,t0));

NV_D(psi_vec, +=, C_U(c1,t1), C_V(c1,t1), C_W(c1,t1));

NV_S(psi_vec, /=, 2.); /* averaging. */

NV_S(psi_vec, *=, (((C_R(c0,t0) + C_R(c1,t1)) / 2.)));

}

/* Now psi_vec contains our "psi" from above. */ /* Next, get the face normal vector: */

F_AREA(A, f, t);

/* Finally, return the dot product of both. */ /* Fluent will multiply the returned value */ /* by phi_f (the scalar's value at the face) */ /* to get the "complete" advective term... */

return NV_DOT(psi_vec, A);

}
  Reply With Quote

Old   December 4, 2008, 09:58
Default Re: UDS Flux
  #2
Thiru
Guest
 
Posts: n/a
One Update friends. When I deleted the density terms (C_R(c,t) and F_R(f,t)) it is working fine. Without density multiplication it becomes Volumetric flow rate. But if I want mass flow rate, I need density right?

  Reply With Quote

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
About specified flux John FLUENT 0 November 13, 2008 06:37
ratio of total heat flux and radiative heat flux S.Karthikeyan FLUENT 2 July 1, 2008 04:48
WALL HEAT FLUX V.S. HEAT FLUX tommy CFX 0 December 15, 2005 09:14
Help with UDS FLUX Andrew Garrard FLUENT 2 February 14, 2005 06:47
Flux in UDS Ulrich FLUENT 1 May 30, 2000 13:37


All times are GMT -4. The time now is 15:05.