Gas flow past two spheres located in volume with punched walls

The multiply-connected domain (volume with holes in which two spheres are located) is considered. The types of the subdomains (final volumes) are presented on which the initial domain can be divided. For each type of the final volumes the curvilinear coordinate system is introduced. On the basis of the given division the numerical method of calculation of viscous gas flow in the multiply-connected domain is considered. The results of calculations are presented at $\mathrm{Re}=100$, $\mathrm{Re}=500$, $\mathrm M=0.6$.