|
[Sponsors] |
October 21, 2009, 02:29 |
UDF for wall boundary condition
|
#1 |
New Member
Suren L S
Join Date: Oct 2009
Posts: 2
Rep Power: 0 |
Greetings. I am in need of some technical advice here. I am trying to simulate a cavity-filling flow. My geometry (2D) is a simple rectangle, and the two longest edges are the top and bottom wall. The other two edges are the 'velocity inlet' and 'pressure outlet' respectively, and the flow is from left to right. The cavity is initially filled with air and a viscous polymer enters via the velocity inlet at a fixed velocity. I am using a transient, segregated, laminar solver, with the VOF scheme to model the filling process. In addition I am also solving the energy equation and using a power law model to model the viscosity of the polymer. Right now, the solution converges, and the results are decent except for one particular problem. The layer closest to the wall remains as air and the polymer does not displace it at a reasonable rate - this results in a rather skewed flow front profile. I have read literature on this problem and some researchers have overcome this by using two sets of wall-slip conditions. No-slip for the viscous polymer and traction-free for the air. I am trying to do this as well, but am having quite a bit of trouble implementing this as a UDF. I would appreciate any help. Thanks.
Suren |
|
Tags |
udf, uds, walls boundary conditions |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Boundary Condition Types Using Scheme and UDF | Nasir | FLUENT | 0 | September 15, 2008 21:54 |
UDF for pressure oulet boundary condition | Jubs | FLUENT | 0 | February 13, 2007 00:26 |
UDF for the boundary condition | Sridhar | FLUENT | 3 | July 13, 2001 19:18 |
UDF : boundary condition ID | Flav | FLUENT | 4 | June 28, 2001 09:52 |
UDF, using DEFINE_ADJUST to change a boundary condition | Jonas Larsson | FLUENT | 4 | March 21, 2000 18:51 |