Code validation for the magnetohydrodynamic flow at high Hartmann Number based on unstructured grid

• In this paper, a numerical code named MTC-H 2.0 based on unstructured mash was developed and validated.
• In the code, a current density conservative scheme is used to ensure the conservative of current, Krylov subspace method and AMG method were used to improve the computing performance.
• Both analytical and experimental cases were chosen to validate the code at high Hartmann number.
• The code has good computing performance, and numerical results matched well with the analytical and experimental results.

In order to analyze the magnetohydrodynamic (MHD) effect in liquid metal fusion blanket, a parallel and high performance numerical code was developed to study MHD flows at high Hartmann Number based on the unstructured grid. In this code, the induced current and the Lorentz force were calculated with a current density conservative scheme, while the incompressible Navier–Stokes equations with the Lorentz force included as a source term was solved by projection method, a set of method were used to improve the computing performance such as Krylov subspace method and AMG method. To validate this code, three benchmarks of MHD flow at high Hartmann Number were conducted. The first benchmark was the case of Shercliff fully development flow, the second benchmark was the MHD flow in a circular pipe with changing external magnetic field, and the third benchmark was the MHD flow in a pipe with sudden expansion. In these cases the Hartmann Numbers were from 1000 to 6000. The code good computing performance, and numerical results show matched well with the analytical and experimental results.