The paper presents some results of modeling low compressible gas flows on GPU-based hybrid computer systems. Finite difference scheme is based on the Quasi Gas Dynamic (QGD) equations system. The successful experience in solving a wide variety of gas dynamic problems by means of QGD based schemes showed that they describe viscous heat conducting flows as good as schemes for Navier-Stokes equations, where the latter are applicable. To improve the stability condition of the explicit scheme described here the flux relaxation approach was used, which permits to achieve practically Courant like stability condition even for very low Mach numbers. So, it is very convenient for computer systems with hybrid architecture. Parallel realization is based on shmem programming technology. The calculation results show good parallelization efficiency.