Time Acceleration Methods for Advection on the Cubed Sphere

Climate simulation will not grow to the ultrascale without new algorithms to overcome the scalability barriers blocking existing implementations. Until recently, climate simulations concentrated on the question of whether the climate is changing. The emphasis is now shifting to impact assessments, mitigation and adaptation strategies, and regional details. Such studies will require significant increases in spatial resolution and model complexity while maintaining adequate throughput. The barrier to progress is the resulting decrease in time step without increasing single-thread performance. In this paper we demonstrate how to overcome this time barrier for the first standard test defined for the shallow-water equations on a sphere. This paper explains how combining a multiwavelet discontinuous Galerkin method with exact linear part time-evolution schemes can overcome the time barrier for advection equations on a sphere. The discontinuous Galerkin method is a high-order method that i...

• Type: Conference
• Year: 2009
• Where: ICCS
• Authors: R. K. Archibald, Katherine J. Evans, J. B. Drake, James B. White
• Keywords: Applied Computing, Climate Simulations, Discontinuous Galerkin, Discontinuous Galerkin Method, ICCS 2009