Implementation of slip boundary conditions in the finite volume method: new techniques

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Ferras, LL (Autor) Outra; Nobrega, JM (Autor) Outra; F. T. Pinho (Autor) FEUP

Revista

Título: International Journal for Numerical Methods in Fluids

Vol. 72 Nº 7

Páginas: 724-747

ISSN: 0271-2091

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 11 Citações

Scopus - 15 Citações

INSPEC

Outras Informações

ID Authenticus: P-004-ZS9

DOI: 10.1002/fld.3765

Abstract (EN): Two different techniques for the implementation of the linear and nonlinear slip boundary conditions into a finite volume method based numerical code are presented. For the linear Navier slip boundary condition, an implicit implementation in the system of equations is carried out for which there is no need for any relaxation, especially when handling high slip coefficients. For three different nonlinear slip boundary conditions, two different methods are devised, one based on solving a transcendental equation for the boundary and the other on the linearization of the slip law. For assessment purposes, comparison is made between these new methods and the usual iterative process. With these new methods, the convergence difficulties, typical of the iterative procedure, are eliminated, and for some of the test cases, the convergence rate even increased with the slip velocity. The details of these implementations are given first for a simple geometry using orthogonal meshes and Cartesian coordinates followed by their generalization to non-Cartesian coordinates and nonorthogonal meshes. The developed code was tested in the benchmark slip-stick and 4:1 contraction flows, evidencing the robustness of the proposed procedures. Copyright (c) 2013 John Wiley & Sons, Ltd.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 24