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#1 |
Member
Dimitrios S. P.
Join Date: Jan 2018
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Hello everyone.
Here is another question. My problem is that I have liquid flow in two domains that have a common interface. The interface allows a mass flow to one direction which is analogous to the wall shear stresses that are applied to it. How can I model it in CFX, since I cannot write any conditional flow. |
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#2 |
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Glenn Horrocks
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Have you looked at the options available to interfaces? You can specify a mass flow rate at interfaces, and you could make that a function of wall shear stresses or other variables.
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#3 |
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Dimitrios S. P.
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Yes, but this applies an equal distributed mass flow to the interface, not an variable one.
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#4 |
Super Moderator
Glenn Horrocks
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Then maybe make it a standard conservative connection, but use a momentum source term to control the flow locally as a function of anything you like.
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#5 |
Member
Dimitrios S. P.
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This would have been a good solution,
if cfx had enabled an option of momentum source in interfaces. Unfortunately, cfx fails to my expectations again. What do you thing of the idea of creating a thin subdomain, instead of just a surface, and apply in it momentum sources? |
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#6 |
Super Moderator
Glenn Horrocks
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The thin subdomain can work.
I can't check now, but I thought you could put source terms on interface boundaries. You have to put it on the boundary face, not the interface object.
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#7 |
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Dimitrios S. P.
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i will try the option of defining a thin subdomain for the thin surface,
since CFX does not allow the modeling of both an interface and a boundary on the same surface. Thanks for your help Glenn! |
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#8 | |
Super Moderator
Glenn Horrocks
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Quote:
There is no such thing as a source term boundary condition - you apply source terms as additional terms on existing domain features.
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#9 |
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Dimitrios S. P.
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But interface's sides also do not allow momentum sources, only continuity sources.
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#10 |
Super Moderator
Glenn Horrocks
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OK, thanks for that. I was not at my workstation so could not check that.
In that case the thin subdomain might be the best way forward.
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conditions of interfaces |
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