Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Characteristics based boundary conditions for incompressible flow over a step inside a channel

Author
Abstract
The present study proposes a new characteristic based wall boundary condition for incompressible Navier-Stokes equations using artificial compressibility correction. Traditionally, for estimating the pressure on solid walls, ordinary extrapolation from inner cells of domain is used. It has been shown in this study that by using characteristic boundary condition on solid walls, the convergence rate is improved in comparison with old extrapolating method for pressure. For this purpose, a computer code using CB scheme has been developed for numerical tests in the case of incompressible flow over a backward facing step. Also, obtained results with new proposed boundary condition show good agreement with experimental and numerical data in the literature.
Keywords

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Volume 15, Issue 4 - Serial Number 33
Fluid Mechanics and Heat Transfer
Winter 2014
Pages 6-22

  • Receive Date 20 February 2014