This page was originally created as a complement to this thread: http://www.cfd-online.com/Forums/openfoam-solving/59842-some-results-new-compressible-flow-solver.html - But the original author never got around to finish the page, in the sense to move it to the correct location.
In addition, further reference should be done to this thread: http://www.cfd-online.com/Forums/openfoam-solving/58569-rhocentralfoam-detail.html
And it looks like the page is actually harbouring descriptions for two solvers...