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alternatives to moving mesh

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Old   March 31, 2015, 22:15
Default alternatives to moving mesh
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Thangam Natarajan
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If one has to simulate oscillating plate/solid wall ( sinusoidal function of time) in a domain (a simple piston movement in 'y' direction), the obvious way would be scenario 1. For brevity, assume there is no topological changes involved.

Scenario 1:
To use dynamic mesh and move the mesh points via the prescribed equation.

Scenario 2:
The fluid near wall takes up a zero velocity (assuming no slip). Now, With this in mind, using an oscillating velocity boundary condition in 'U' at the plate/solid wall (working out the velocity of the fluid for the plate's displacement amplitude) as the fluid should obey the no slip condition and produce the flow features similar to a moving mesh ?

Will the result of scenario 2 be different to scenario 1? Is scenario 2 the right way to represent a near wall fluid with no slip? what happens to 'k' and 'pressure' in scenario 2?


Thanks
Thangam.
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dynamic mesh, moving mesh., no-slip, wall boundary condition

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