Kinematic dynamo in spherical Couette flow

摘要: We investigate numerically kinematic dynamos driven by flow of electrically conducting fluid in the shell between two concentric differentially rotating spheres, a configuration normally referred to as spherical Couette flow. compare axisymmetric (2D) and fully three dimensional flows, low high global rotation rates, prograde retrograde differential rotations, weak strong nonlinear inertial forces, insulating boundaries, aspect ratios. The main results are follows. Azimuthally drifting Rossby waves arising from destabilisation Stewartson shear layer crucial dynamo action. Differential helical combine contribute dynamo. At slow rate, direction plays an important role because different patterns flows. rapid stronger supercriticality (namely difference rate its critical value for onset nonaxisymmetric instability) facilitates A magnetic boundary condition larger ratio both favour