implemented unconventional D3Q27 stencil by Abbas Fakhari
In the paper 3D phase-field is written :
As for the discrete velocity set of the D3Q27 lattice used for the hydro- dynamics, a slightly unconventional ordering was used in order to align the first 15 velocity directions with the D3Q15 model.
Therefore I also implemented this stencil with the name fakhari. For the D3Q15 stencil they used: premnath