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- [avalanch2fluids.py](https://git.immc.ucl.ac.be/fluidparticles/migflow/blob/master/testcases/avalanch/avalanch2fluids/avalanch2fluids.py) presents the fall of a granular column immersed in sea water in a 2D domain filled with soft water.
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## Free surface
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## Arbitrary Eulerian-Lagrangian (ALE) method & Free Surface
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A free surface whose resolution is based on an Arbitrary Lagrange-Euler (ALE) method can be simulated. The following testcase makes use of this feature:
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The MigFlow software can take into account mesh deformation using the Arbitrary Eulerian-Lagrangian (ALE) framwork. An example of this feature can be found :
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- [poiseuilleALE.py](https://git.immc.ucl.ac.be/fluidparticles/migflow/blob/master/testcases/poiseuilleALE/poiseuille.py)
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The user has to provide the mesh velocity and update the mesh coordinates. This feature can be used to simulate free-surface :
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- [dieSwell.py](https://git.immc.ucl.ac.be/fluidparticles/migflow/blob/master/validation/dieSwell/dieSwell.py) presents the swelling of a flow past a die in 2D.
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