New approach in boundary conditions for incompressible flows using characteristic relations
作者： Kamiar Zamzamian
关键词: Boundary value problem 、 Reynolds number 、 Compressibility 、 Rate of convergence 、 Boundary layer thickness 、 Extrapolation 、 Robin boundary condition 、 Mathematics 、 Mathematical analysis 、 Mixed boundary condition
摘要: The present study proposes a new characteristic-based wall boundary condition for incompressible Navier-Stokes equations using artificial compressibility correction. Traditionally, ordinary extrapolation from inner cells of domain is used estimating the pressure on solid walls. It has been shown in this that by characteristic walls, convergence rate improved comparison with old extrapolating method estimation especially at high Reynolds numbers. For purpose, computer code (CB) scheme developed numerical tests which were applied wide range numbers and grid combinations. While, CB exhibits substantial delay as reported literature, can improve its speed. Also, presented idea was calculation outer conditions again showed improvements
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