Created by Raphael Haupt, 26.06.2018

This testcase is checking the multilevel interpolation.
The Layout is a normal 2D channel flow periodic in channel depth.
One refinementpatch is placed in the middle of the channel and so only
interacting with periodic boundary,
the other refinementpatch is placed at lower bound of the channel and so
interacting with periodic and wall boundary.

The directory contains the same testcase 4 times with different combinations:

compressible / incompressible
D2Q9 / D3Q19 / D3Q27
weighted average / quadratic interpolation

testcase 1 : D2Q9  | weighted average        | compressible
testcase 2 : D2Q9  | quadratic interpolation | incompressible
testcase 3 : D3Q19 | weighted average        | incompressible
testcase 4 : D3Q27 | quadratic interpolation | compressible
