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On boundary conditions and numerical methods for the unsteady incompressible Navier-Stokes equations. (English) Zbl 0977.76062

Summary: We discuss various numerical methods and boundary conditions to solve the unsteady incompressible Navier-Stokes equations. It is shown, via the analysis of governing partial differential equations and discretized algebraic equations, that boundary conditions necessary to solve the incompressible Navier-Stokes equations are conditions either for normal and tangential components of velocities, or alternatively for normal velocity and tangential vorticity components. In an explicit formulation, the solution of the resulting system of algebraic equations is more efficiently by solving the Poisson equation either for pressure or for velocity. The boundary conditions necessary to solve these Poisson equations are provided from velocity boundary conditions and momentum equations. Finally, we present numerical simulations of selected unsteady flows.

MSC:

76M20 Finite difference methods applied to problems in fluid mechanics
76D05 Navier-Stokes equations for incompressible viscous fluids
Full Text: DOI

References:

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