Upwind basis finite elements for convection-dominated problems

✍ Scribed by P. M. Steffler

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 836 KB
• Volume: 9
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/fld.1650090403

✦ Synopsis

Finite elements using higher-order basis functions in the spirit of the QUICK method for cpnvectiondominated fluid flow and transport problems are introduced and demonstrated. Instead of introducing new internal degrees of freedom, completeness is achieved by including functions based on nodal values exterior and upwind to the element domain. Applied with linear test functions to the weak statements for convectiondominated problems, a family of Petrov-Galerkin finite elements is developed. Quadratic and cubic versions are demonstrated for the one-dimensional convection-diffusion test problem. Elements of up to seventh degree are used for local solution refinement. The behaviour of these elements for one-dimensional linear and non-linear advection is investigated. A two-dimensional quadratic upwind element is demonstrated in a streamfunction-vorticity formulation of the Navier-Stokes equations for a driven cavity flow test problem. With some minor reservations, these elements are recommended for further study and application.