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This research is based on the iterative space-marching method for incompressible and compressible Navier–Stokes equations[1-4]. A principle of parallel computational schemes construction for steady and unsteady problems is suggested. It is analytically proven that convergence of these schemes is unconditional for incompressible case. When the parallel scheme is used the total volume of computations is the sum of a large number of independent and equal parts. Estimation of the speed-up K shows that K>1000 in ideal case. First results of using the parallel schemes are presented.