Still computational methods for the advection-diffusion-reaction transport equa- tion are a challenge. Although there exist globally stable methods, oscillations around sharp layers such as boundary, inner and outflow layers, are typical in multi-dimensional flows. In this paper a variational formulation that combines two types of stabilization integrals is proposed, namely an adjoint stabilization and a gradient adjoint stabilization. The two free parameters are chosen imposing one- dimensional superconvergence. Then, when applied to multi-dimensional flows, the method presents better local stability than present stabilized methods. Furthermore, in the advective-diffusive limit and for piecewise linear functional spaces, the method recovers the classical SUPG method.
Combining adjoint stabilized methods for the advection-diffusion-reaction problem
SANGALLI, GIANCARLO;
2007-01-01
Abstract
Still computational methods for the advection-diffusion-reaction transport equa- tion are a challenge. Although there exist globally stable methods, oscillations around sharp layers such as boundary, inner and outflow layers, are typical in multi-dimensional flows. In this paper a variational formulation that combines two types of stabilization integrals is proposed, namely an adjoint stabilization and a gradient adjoint stabilization. The two free parameters are chosen imposing one- dimensional superconvergence. Then, when applied to multi-dimensional flows, the method presents better local stability than present stabilized methods. Furthermore, in the advective-diffusive limit and for piecewise linear functional spaces, the method recovers the classical SUPG method.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
