OpenFOAM is an open source CFD solver based on Finite Volume Method (FVM) for solving the describing Partial Differential Equations of fluid dynamics. It is widely used both by the academic and industrial community. Fluid dynamic problems are typically very heavy from mathematical i.e. computational point of view. This implies practically the must to use High Performance Computing (HPC) facilities for academical and industrial problems. For FVM solvers the high performance can be realized by so called domain decomposition technique, where the computational domain is dived into smaller domains, where the problem is solved for each subdomain separately on a separate CPU core. As flow is flowing among the different subdomains in the solution the separate subdomains needs to communicate with eachother. In this way to having access to high number of cpu cores which can communicate “well” with eachother can speed up the simulation, this is provided by Komondor.