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Stationary bubble or droplet

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Old   March 30, 2017, 18:03
Default Stationary bubble or droplet
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I am trying to investigate some test cases with openFOAM, with interFoam, which simulating a stationary bubble is also one.

Either I choose a water drop in a medium of air, or an air bubble in a medium of water, the maximum spurious velocity keeps decreasing till say ~0.8 seconds, and then it keeps rising to even values larger than the first time step at say ~2 seconds. Is this normal? should this happen?

Another issue is that, the interface in both cases becomes very diffuse, initially the interface is reasonable in thickness, not that thick, but as simulation proceeds (~0.5 seconds) the thickness increases leading to a very diffuse interface (transition zone of interface ~0.2*radius), is this also normal?

This is my fvschemes
	default 	Euler; //CrankNicolson 0.9; 

	default 	Gauss linear;
	grad(U) 	Gauss linear;
	grad(alpha.water) Gauss linear;

	default 	none;
    div(rhoPhi,U)  Gauss limitedLinearV 1;
    div(phi,alpha)  Gauss vanLeer;
    div(phirb,alpha) Gauss interfaceCompression; //Gauss linear;
    div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;

	default 	Gauss linear corrected;

	default 	linear;

	default 	corrected;

	default 	no;
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interface compression, interfoam bubble

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