圆柱位型磁流体速度的数值计算

Numerical Calculation of Magnetohydrodynamic Velocity in Cylindrical Geometry

应用半解析方法,研究了具有圆柱位型的等离子体处于不同压强时,磁流体速度随半径的演化规律。数值计算结果表明:当等离子体压强不同时,径向速度的变化较小,角向速度和轴向速度的变化较大。轴向速度随半径的演化规律与角向速度的规律类似,但是,压强对轴向速度的影响比对角向速度的影响更加明显。等离子体压强对长波模式流体的速度影响较为明显。

The magnetohydrodynamic（ MHD） flow field in cylindrical was mathematically modeled,theoretically calculated in semi-analytical method and numerically simulated. The effect of the plasma pressure and radius on the MHD velocities was investigated by numerically solving the MHD equations. The simulated results show that the plasma pressure and radius all have a major impact on the MHD velocity. To be specific,the plasma pressure significantly affects the MHD velocities,especially long wavelength MHD velocities. The pressure has a strong impact on the azimuthal velocity,a stronger impact on the axial velocity,but a much weaker impact on the radial velocity. The axial and azimuthal velocities were found to depend on the radius in a similar way.