The additive correction multigrid (ACM) method, as originally proposed, does not exhibit good multigrid convergence performance for convection-diffusion equations. A new, enhanced ACM methodology is proposed which uses higher-order restriction operators for explicit formulation of coarse-grid coefficients. The enhanced ACM method offers significant improvement in convergence performance for convection-diffusion equations. The enhanced ACM method is demonstrated to be robust and offers enhanced convergence performance for both convection-dominated and diffusion-dominated cases.
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