I am about to simulate fluid flow in porous media using a CFD software (COMSOL). I am about to construct my 3D porous media from *.raw CT scan images token from sandstone rocks. The source of samples are Imperial college under supervision of Dr. Blunt.

 The problem is I do not know what is the best software ,free preferably , to use and how ?

 I appreciate any help, here. 

Thanks

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