Kenjeres S, Hanjalić K
Department of Multi Scale Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Phys Rev Lett. 2007 Mar 9;98(10):104501. doi: 10.1103/PhysRevLett.98.104501. Epub 2007 Mar 6.
We present numerical simulations of a turbulent magnetic dynamo mimicking closely the Riga-dynamo experiment at Re approximately 3.5x10(6) and 15< or =Rem< or =20. The Reynolds-averaged Navier-Stokes equations for the fluid flow and turbulence field are solved simultaneously with the direct numerical solution of the magnetic field equations. The fully integrated two-way-coupled simulations reproduced all features of the magnetic self-excitation detected by the Riga experiment, with frequencies and amplitudes of the self-generated magnetic field in good agreement with the experimental records, and provided full insight into the unsteady magnetic and velocity fields and the mechanisms of the dynamo action.
我们给出了一个湍流磁发电机的数值模拟，该模拟紧密模仿了里加发电机实验，雷诺数约为3.5×10⁶，且15≤磁雷诺数≤20。流体流动和湍流场的雷诺平均纳维-斯托克斯方程与磁场方程的直接数值解同时求解。完全集成的双向耦合模拟再现了里加实验检测到的磁自激的所有特征，自生磁场的频率和幅度与实验记录吻合良好，并深入洞察了非定常磁场和速度场以及发电机作用的机制。
