Title

Velocity-pressure coupling in finite difference formulations for the Navier-Stokes equations.

Date of Award

2006

Degree Type

Dissertation

Degree Name

Ph.D.

Department

Mathematics and Statistics

Keywords

Mathematics.

Rights

CC BY-NC-ND 4.0

Abstract

A new numerical algorithm for solving the two-dimensional, steady, incompressible, laminar, viscous flow equations on a staggered grid is presented in this thesis. The proposed methodology is finite difference based, but essentially takes advantage of the best features of two well-established numerical formulations, the finite difference and finite volume methods. Some weaknesses of the finite difference approach are removed by exploiting the strengths of the finite volume method. In particular, the issue of velocity-pressure coupling is dealt with in the proposed finite difference formulation by developing a new pressure correction equation in a manner similar to the SIMPLE (Semi-Implicit Method for Pressure Linked Equations) approach commonly used in finite volume formulations. However, since this is purely a finite difference formulation, numerical approximation of fluxes is not required. Results obtained from the present method are based on the first-order upwind differencing scheme for the convective terms, but the methodology can easily be modified to accommodate higher order differencing schemes. Comparison with exact solutions for flow in a straight duct is made. The new formulation is also validated against experimental and other numerical data for well-known benchmark problems, namely the lid-driven cavity and backward-facing step flows. For curvilinear domains, the proposed method is validated against numerical results for a complex channel flow and compared to experimental results for the flow over a scour hole. For further validation, some of the results from the present method are compared to results obtained by FLUENT.Dept. of Mathematics and Statistics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2006 .Z64. Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3842. Thesis (Ph.D.)--University of Windsor (Canada), 2006.