Interface between fluid domain and porous domain

windhair · September 3, 2009, 11:51

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

John · September 3, 2009, 13:19

not converged results?

windhair · September 4, 2009, 04:46

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.

ghorrocks · September 4, 2009, 09:01

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?

windhair · September 10, 2009, 09:12

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.

nkwtan · September 5, 2013, 21:45

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.

narendrapatel111 · May 10, 2018, 15:26

Hi... Did you find justification for this jump in velocity? Is it correct velocity or not ? How did you resolve the issue ?

September 3, 2009, 11:51	Interface between fluid domain and porous domain	#1
windhair 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

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September 3, 2009, 13:19		#2
John Member Join Date: Mar 2009 Posts: 49 Rep Power: 17	not converged results?

September 4, 2009, 09:01		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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, 09:12		#5
windhair 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, 21:45		#6
nkwtan 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, 15:26		#7
narendrapatel111 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 ?