轴向磁场作用下平均Taylor涡对湍流脉动的影响

采用基于高精度电流守恒格式的直接数值模拟方法，对轴向磁场作用下导电流体的湍流Taylor-Couette流动进行计算.在等电势边界条件的同心圆筒中，磁场与感生电流引起的反向周向速度分布、以及其对平均流动的影响被揭示出来.采用两种不同的湍流流场平均方法，将湍流中的全部脉动划分为平均流动(Taylor涡)的贡献和湍流的贡献.通过计算不同磁场强度下的湍动能的分布，对比分析轴向磁场对平均Taylor涡流和湍流两种贡献方式的影响.

Effect of Mean Taylor Vortex Motion on Turbulent Fluctuations in the Presence of Axial Magnetic Field

The direct numerical simulation based on the current density conservative scheme was employed to calculate the turbulent Taylor-Couette flow of an electrically conducting fluid in an axial magnetic field. The generation of negative velocity due to the interaction of magnetic field with induced current， and the effect of magnetic field on the mean flow field were revealed， when two cylinders had the same potentials. By using two kinds of averaged method， the total fluctuations in the flow field were divided into two parts，i.e.， the contribution of mean Taylor vortex flow and the contribution of turbulence. Consequently， several cases were calculated to investigate the effect of magnetic field on the contribution， and comparation the effects of axial magnetic field on from mean Taylor vortex flow and the turbulent flow.