INT: Integration of rhoPimpleAdiabaticFoam

Solver for low Mach no. flows with adiabatic thermodynamics and updated
pressure-velocity coupling given by the RCM interpolation procedure
described in

    \verbatim
        Knacke, T. (2013).
        Potential effects of Rhie & Chow type interpolations in airframe
        noise simulations. In: Schram, C., Dénos, R., Lecomte E. (ed):
        Accurate and efficient aeroacoustic prediction approaches for
        airframe noise, VKI LS 2013-03.
    \endverbatim

Original code supplied by Thilo Knacke, CFD E+F GmbH
contact: info@cfd-berlin.com

Integrated into OpenFOAM by OpenCFD Ltd.