epsilonm is obtained by combining epsilon.gas and epsilon.liquid in a two-phase
system, each of which will apply the epsilonWallFunction at walls; the
epsilonmWallFunction propagates the resulting wall epsilonm into the near-wall
cells.
If the 0/epsilonm file is provided the epsilonmWallFunction should be specified
for walls, if the 0/epsilonm file is not provided it will be generated
automatically and the epsilonmWallFunction applied to walls for which the
epsilonWallFunction is specified in the epsilon.liquid file.
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