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Dynamic gradient mesh adaption not working properly

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Old   August 28, 2018, 05:19
Default Dynamic gradient mesh adaption not working properly
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Hi everyone,

I am trying to simulate a 2 phase flow and the dynamic mesh adaption that I set at the interface is not working properly. In general it refines and coarsens correctly, but I get local coarseninf of the mesh at certain interface areas, where I want the mesh to be finest.

My dynamic mesh settings are as follows:
-Smoothing unchecked.
-Layering checked: Ratio based, split factor=0.4, collapse factor=0.4
-Remeshing checked: remeshing methods: local cell, parameters: min length scale=0.22m; max length scale: 0.63m; max cell skewness=0.7, size remeshing interval=5

My gradient adaption settings are:
Refine checked
Coarsens checked
Method: Gradient>Phases>Vol fraction>phase: water
Normalization: Scale (my computed values lie between 1.42e-14 and 14.5), coarsen threshold=1.5e-14, refine threshold = 1e-13
Dynamic checked, interval=6

I am new to dynamic mesh and dynamic gradient adaption, so any help would be highly appreciated.

The mesh is a 2d rectangle and the left wall is moving. The fluids are water and air.

Thanks in advance.
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