421 research outputs found
RESEARCH ON THE REFORM AND INNOVATION OF HIGHER MATHEMATICS TEACHING FROM THE PERSPECTIVE OF EDUCATIONAL PSYCHOLOGY
A Conservative Finite Element Solver for MHD Kinematics equations: Vector Potential method and Constraint Preconditioning
A new conservative finite element solver for the three-dimensional steady
magnetohydrodynamic (MHD) kinematics equations is presented.The solver utilizes
magnetic vector potential and current density as solution variables, which are
discretized by H(curl)-conforming edge-element and H(div)-conforming face
element respectively. As a result, the divergence-free constraints of discrete
current density and magnetic induction are both satisfied. Moreover the
solutions also preserve the total magnetic helicity. The generated linear
algebraic equation is a typical dual saddle-point problem that is
ill-conditioned and indefinite. To efficiently solve it, we develop a block
preconditioner based on constraint preconditioning framework and devise a
preconditioned FGMRES solver. Numerical experiments verify the conservative
properties, the convergence rate of the discrete solutions and the robustness
of the preconditioner.Comment: 13 pages. arXiv admin note: text overlap with arXiv:1712.0892
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