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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Viscous flow boundary question

Posted 2011年2月20日 GMT-5 17:10 Fluid & Heat, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.1 3 Replies

Phil Resor
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Hello,

I am trying to simulate a region of a deforming viscous solid (ie the lithosphere of Venus). I would like to specify the equivalent of a horizontal strain boundary condition - with the horizontal velocity fixed and the vertical velocity free. Any suggestions? I am using the standard Laminar Flow physics.

Thanks,

Phil
3 Replies Last Post 2011年2月23日 GMT-5 01:54
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年2月21日 GMT-5 01:39
Hi

I would study the underlaying COMSOL equations of noslip, and moving wall BC's (and perhaps some of the others) I believe you will find your need therein, if not by tweaking these somewhat

--
Good luck
Ivar
Hi I would study the underlaying COMSOL equations of noslip, and moving wall BC's (and perhaps some of the others) I believe you will find your need therein, if not by tweaking these somewhat -- Good luck Ivar
Phil Resor
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Posted: 1 decade ago 2011年2月22日 GMT-5 20:48
Thanks for the suggestion Ivar,

I think I see what I need in the slip wall BC. The default sets the normal velocity to zero while leaving the tangential free. I can adjust the normal to a fixed velocity as in the moving wall.

Can anyone lead me toward resources that will instruct me on how to create a user-defined boundary condition? Can this be done within the COMSOL GUI?

Phil
Thanks for the suggestion Ivar, I think I see what I need in the slip wall BC. The default sets the normal velocity to zero while leaving the tangential free. I can adjust the normal to a fixed velocity as in the moving wall. Can anyone lead me toward resources that will instruct me on how to create a user-defined boundary condition? Can this be done within the COMSOL GUI? Phil
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年2月23日 GMT-5 01:54
Hi

study the existing BC and add weak contributions at will
You might need to turn on the Main Physics Node - Advanced Settings - Show all model inputs

--
Good luck
Ivar
Hi study the existing BC and add weak contributions at will You might need to turn on the Main Physics Node - Advanced Settings - Show all model inputs -- Good luck Ivar

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