I jsut checked on the Opensuse Build Service. There are OpenMPI RPMs available for SLES 11 SP2 - but not SLES 11 SP1
http://software.opensuse.org/package/openmpi (then click on Show Other Versions ) I have got openmpi installed on my SLES 11 SP1 system, version 1.3.2 Zypper says it is rovided by the System repository - so it should be on the SLES DVDs you have. As an aside, installing Openfoam is not trivial - it even packages up its own version of gcc.
