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Thermally coupled magneto-hydrodynamics (MHD) studies the dynamics of electro-magnetically and thermally driven flows, involving MHD equations coupled with heat equation. We introduce a partitioned method that allows one to decouple the MHD equations from the heat equation at each time step and solve them separately. The extrapolated Crank-Nicolson time-stepping scheme is used for time discretization while mixed finite element method is used for spatial discretization. We derive optimal order error estimates in suitable norms without assuming any stability condition or restrictions on the time step size. We prove the unconditional stability of the scheme. Numerical experiments are used to illustrate the theoretical results.

an international journal of optimization and control: theories and applications/e-an international journal of optimization and control: theories and applications

A decoupled Crank-Nicolson time-stepping scheme for thermally coupled magneto-hydrodynamic system