The fluid dynamics and heat transfer resolution problem through the numeric methods have a computational cost extremely high and a lot of times prohibitive due to the great number of equations are resolved.  An alternative to improve the speed of convergence of these problems would be the use of the Multigrid methods, which accelerate considerably the resolution of the linear systems involved in the problem [Maliska 2004]. 
The Multigrid method available in CFD Sinflow Library and in the CFD Studio software is the method based on addictive corrections, commented to proceed.