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sliding wall boundary condition

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Hi, I'm new to COMSOL and I'm trying to teach myself the software by trying some simple examples so that I can build my own, more complicated model as part of a dissertation on Fluid dynamics (specifically, a problem on fluid film coating theory) at university.

I'm having some issues with using the sliding wall boundary condition. These are mostly down to the fact I don't know what it does. For example, I've made a simple 2D geometry consisting of a rectangle (short and fat) with slip conditions on the bottom and right hand walls, a free surface on the top and a sliding wall with no-slip on the left edge. I'm using the Moving Mesh (ALE) transient analysis with Incompressible Navier-Stokes in the Multiphysics menu. Essentially, I've copied the Sloshing Tank example from the model gallery (www.comsol.com/showroom/gallery/435/).

So, my question is: what does the sliding wall do? Does it stay where it is and work as a kind of conveyor belt, or does it move from where it is with the velocity you define?

1 Reply Last Post 20 gen 2011, 09:10 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 20 gen 2011, 09:10 GMT-5
Hi

if you index your doc files and search for "sliding wall" you will among others find in:
v3.5a p44 of chemug.pdf

- When a wall moves with a prescribed tangential velocity, use the Sliding wall condition.

--
Good luck
Ivar
Hi if you index your doc files and search for "sliding wall" you will among others find in: v3.5a p44 of chemug.pdf - When a wall moves with a prescribed tangential velocity, use the Sliding wall condition. -- Good luck Ivar

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