论文标题
磁性水力动力学和准静态磁流失动力动力湍流的湍流阻力减少
Turbulent drag reduction in magnetohydrodynamic and quasi-static magnetohydrodynamic turbulence
论文作者
论文摘要
在流体动力的湍流中，动能在大尺度的级联反射到惯性范围内，导致恒定的动能通量。相比之下，在磁性水力学（MHD）湍流中，将一部分动能转移到磁能。因此，对于相同的动能注射速率，与流体动力的对应物相比，MHD湍流中的动能通量降低。这导致非线性术语相对弱（$ \ la |（{\ bf u} \ cdot \ nabla）{\ bf u} | \ ra $，其中$ {\ bf u} $是速度磁场）和湍流，但是MHD Turbence velocity field Field tragity drag却加强了。我们使用流体动力和MHD湍流的壳模型模拟上述验证。准静态MHD湍流也表现出类似于MHD湍流的湍流阻力减少。
In hydrodynamic turbulence, the kinetic energy injected at large scales cascades to the inertial range, leading to a constant kinetic energy flux. In contrast, in magnetohydrodynamic (MHD) turbulence, a fraction of kinetic energy is transferred to the magnetic energy. Consequently, for the same kinetic energy injection rate, the kinetic energy flux in MHD turbulence is reduced compared to its hydrodynamic counterpart. This leads to relative weakening of the nonlinear term ($\la | ({\bf u}\cdot \nabla) {\bf u} | \ra$, where ${\bf u}$ is the velocity field) and turbulent drag, but strengthening of the velocity field in MHD turbulence. We verify the above using shell model simulations of hydrodynamic and MHD turbulence. Quasi-static MHD turbulence too exhibits turbulent drag reduction similar to MHD turbulence.
