An unsplit Godunov method for ideal MHD via constrained transport in three dimensions

作者: Thomas A. Gardiner , James M. Stone

DOI: 10.1016/J.JCP.2007.12.017

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摘要: We present a single step, second-order accurate Godunov scheme for ideal MHD which is an extension of the method described in [T.A. Gardiner, J.M. Stone, An unsplit godunov via constrained transport, J. Comput. Phys. 205 (2005) 509] to three dimensions. This algorithm combines corner transport upwind (CTU) Colella multidimensional integration, and (CT) preserving divergence-free constraint on magnetic field. describe calculation PPM interface states 3D must include ''MHD source terms'' naturally respect balance implicit these terms by @?.B=0 condition. compare two different forms CTU integration require either 6- or 12-solutions Riemann problem per cell time-step, detailed description 6-solve algorithm. Finally, we solutions test problems demonstrate accuracy robustness

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