|May 30, 2008, 12:29||
Kelvin Helmholtz Instability problem
Hi, I build a KHI model : 4m by 10m rectangular mesh with 50K cells, two layers (the light one above the heavy ) . I use a VOF model and I perturbate the interface between the two layers with a sin function. The problem is that when I run the model, the bottom layer is moving out of the mesh. I use boundary conditions of: velocity inlet (on the left) and pressure outlet (on the right). I normally patch the bottom layer to the phase 2 . I tried to patch the top layer but it didn't help much. How do I keep both of the layers in the mesh?
|July 10, 2009, 11:44||
Andrea Da Ronch
Join Date: Jul 2009
Posts: 1Rep Power: 0
I try to simulate the KH instability by two fluids with different properties (density & velocity) in a 2D domain. I have used a patch file to give the initial conditions. I have got some different instabilities playing with the densities & velocities of the fluids.
Though, I have a doubt.
Is gravity necessary to lead the instability? Our code was intended for high speed for aircraft & gravity is not included. As a consequence, I did not obtained yet the "cat's eye" shape of instability.
Thanks for any advice.
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