# fluids cross interior face?

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 January 19, 2006, 23:16 fluids cross interior face? #1 jdb Guest   Posts: n/a Hello all. I searched "interior face" and read many discussions, but didn't find a solution to my issue: I'm using Fluent (2ddp, axisymmetric) to model two fluid zones. Zone 1 is a field of liquid 1. Zone 2 is a smaller sphere of liquid 2, surrounded by liquid 1. I defined the face where these two zones/meshes meet as "interior". My hope was that when I applied axial velocity to fluid 1, it would "bump into" the face of zone 2 and move around that zone. But instead fluid 1 passes straight through that interior face. I confirmed by analyzing both velocity vectors and path lines. How can I keep one fluid from crossing an interior face into another fluid? Thanks for any assistance. These forums are very helpful...

 January 20, 2006, 00:14 Re: fluids cross interior face? #2 zxaar Guest   Posts: n/a if you define it as interior the fluid will mix with the one on the other side. if you want ot prevent it from doing so define it as wall. i think you have not clearly stated the problem

 January 20, 2006, 03:01 Re: fluids cross interior face? #3 jdb Guest   Posts: n/a If I declare the boundary a "wall", then I presume it will not allow species transport across that wall(?). The goal of my model is species transport from one fluid to the other.

 January 20, 2006, 05:17 Re: fluids cross interior face? #4 zxaar Guest   Posts: n/a understood now. i am not sure what is the solution to this problem.

 January 21, 2006, 05:13 Re: fluids cross interior face? #5 Muhammad Shakaib Guest   Posts: n/a I think you can define species at the wall using boundary conditions if the species model is ON

 January 22, 2006, 17:10 Re: fluids cross interior face? #6 jdb Guest   Posts: n/a I think I understand. Basically, declare the spheres as walls with a fixed mass fraction. Then the surrounding fluid would "pick up" mass fraction from these spherical walls since I allow Species Transport. I just tried it, but the steady analysis would not iterate. It gave me an error "Error: Floating point error: invalid number". And another error "Error Object: ()". Not sure what any of that means.

 January 22, 2006, 18:22 Re: fluids cross interior face? #7 jdb Guest   Posts: n/a Never mind my last note about error messages. I rebuild the model in Gambit and now it works splendidly. Thanks again for the advice. Sometimes it's the simple things that take the longest to realize...

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