A discontinuous Galerkin method for a hyperbolic model for convection–diffusion problems in CFD |
| |
| Authors: | H Gómez I Colominas F Navarrina M Casteleiro |
| |
| Affiliation: | 1. Group of Numerical Methods in Engineering, GMNI, Department of Applied Mathematics, Civil Engineering School, Universidad de A Coru?a, Campus de Elvi?a, 15071 A Coru?a, Spain;2. Group of Numerical Methods in Engineering, GMNI, Department of Applied Mathematics, Civil Engineering School, Universidad de A Coru?a, Campus de Elvi?a, 15071 A Coru?a, SpainE. T. S. de Ingenieros de Caminos, Canales y Puertos, Universidad de A Coru?a, Campus de Elvi?a, 15071 A Coru?a, Spain |
| |
| Abstract: | This paper proposes a hyperbolic model for convection–diffusion transport problems in computational fluid dynamics (CFD). The hyperbolic model is based on the so‐called Cattaneo's law. This is a time‐dependent generalization of Fick's and Fourier's laws that was originally proposed to solve pure‐diffusive heat transfer problems. We show that the proposed model avoids the infinite speed paradox that is inherent in the standard parabolic model. A high‐order upwind discontinuous Galerkin (DG) method is developed and applied to classic convection‐dominated test problems. The quality of the numerical results is remarkable, since the discontinuities are very well captured without the appearance of spurious oscillations. These results are compared with those obtained by using the standard parabolic model and the local DG (LDG) method and with those given by the parabolic model and the Bassi–Rebay scheme. Finally, the applicability of the proposed methodology is demonstrated by solving a practical case in engineering. We simulate the evolution of pollutant being spilled in the harbour of A Coruña (northwest of Spain, EU). Copyright © 2007 John Wiley & Sons, Ltd. |
| |
| Keywords: | convection– diffusion Cattaneo's equation finite speed hyperbolic diffusion discontinuous Galerkin |
|
|
