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Yang July 29, 2006 01:08

free slip boundary conditions
 
Hello all

I use finite volume method and VOF method to simulate the filling process of a viscous liquid in a mold. As a two-phase flow. I meet some problems in boundary conditions. I apply no-slip boundary conditions at the mold wall filled with liquid, i.e. u=0. I want to apply free-slip boundary conditions at the mold wall filled with gas, but I don't know how I describe the free-slip boundary conditions by means of the formulation. Who can give me some advice? Thanks in advance.

Regards

Yang

Ramesh July 29, 2006 03:37

Re: free slip boundary conditions
 
nice idea...

Ram Dayal August 8, 2006 00:59

Re: free slip boundary conditions
 
Hi, For providing free slip BC,I think you should keep two things in mind 1. all the normal velocities normal to free slip wall should be zero. 2. gradient of velocity parallel to wall should be zero. that is v(wall)=v(wall-1). As the wall shear stress is zero for free slip case. Bye Ram Dayal

yang August 8, 2006 07:41

Re: free slip boundary conditions
 
Thank you very much for your reply!

yang August 8, 2006 07:47

Re: free slip boundary conditions
 
By the way, what about the normal viscous stress at the wall? Thanks in advance!

Ram Dayal August 8, 2006 12:19

Re: free slip boundary conditions
 
Hi, Generally the wall BC's are specified via velocity components on the wall. And the wall stresses are the part of solution. Thats what I think. Bye Ram Dayal

yang August 8, 2006 19:19

Re: free slip boundary conditions
 
Thanks!

rabiu abdulai August 17, 2006 11:56

Re: free slip boundary conditions
 
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swiych May 22, 2011 22:14

i am puzzled by this free-slip and no-slip condition, is it apply to closed boundaries? i hope someone can elaborate on this to help me out. Thanks.


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