# Interface between fluid domain and porous domain

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 September 3, 2009, 10:51 Interface between fluid domain and porous domain #1 New Member     Join Date: Mar 2009 Posts: 23 Rep Power: 17 I'm building a model with a free fluid domain and a porous domain, the upper domain is free flow, where the lower is porous media, the flow coming from the left side of upper domain. It is incompressible laminar flow. The velocity component normal to the interface is shown in the attached figure my question is why there are two high velocity region is this result, it looks unreasonable, how can I correct it? Thanks

 September 3, 2009, 12:19 #2 Member   Join Date: Mar 2009 Posts: 49 Rep Power: 17 not converged results?

September 4, 2009, 03:46
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Quote:
 Originally Posted by John not converged results?
I made another run last night, I think it is converged with
Code:
``` |       Equation       | Rate | RMS Res | Max Res |  Linear Solution |
+----------------------+------+---------+---------+------------------+
| U-Mom                | 0.97 | 9.9E-09 | 5.1E-08 |       7.4E-01  ok|
| V-Mom                | 0.97 | 7.5E-10 | 2.0E-08 |       1.3E-01  ok|
| W-Mom                | 0.97 | 3.9E-10 | 1.4E-08 |       2.5E-01  ok|
| P-Mass               | 0.97 | 1.2E-10 | 1.4E-09 |  5.4  7.2E-02  OK|
+----------------------+------+---------+---------+------------------+```

The results show the approaching of the two high velocity region, that looks better, but I'm still wondering about the correctness of this velocity jumping.

 September 4, 2009, 08:01 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,749 Rep Power: 143 Are you sure you have an adequately mesh independent solution? Have you looked at the velocity vectors to see what direction the flow is going? Have you checked the documentation about how velocities in porous regions are handled?

 September 10, 2009, 08:12 #5 New Member     Join Date: Mar 2009 Posts: 23 Rep Power: 17 With refined mesh, the result is better, bu still some problem with interface between porous media and fluid domain. I can not understand the jump of velocity component normal to the interface, when there are only straight forward flow in the upper fluid domain.

 September 5, 2013, 20:45 #6 New Member   Join Date: Sep 2013 Posts: 1 Rep Power: 0 I have same problem I checked both to be porous and both be fluid. I don't see any jump in the interface. however when I select one porous and one fluid. i see this jump. i don't know why this happen.

 May 10, 2018, 14:26 #7 New Member   Narendra Join Date: Mar 2013 Location: Nebraska Posts: 19 Rep Power: 13 Hi... Did you find justification for this jump in velocity? Is it correct velocity or not ? How did you resolve the issue ?