Dynamo transition in low-dimensional models

作者：Verma Mahendra K^*; Lessinnes Thomas; Carati Daniele; Sarris Ioannis; Kumar Krishna; Singh Meenakshi

来源：Physical Review E, 2008, 78(3): 036409.

DOI：10.1103/PhysRevE.78.036409

Two low-dimensional magnetohydrodynamic models containing three velocity and three magnetic modes are described. One of them (nonhelical model) has zero kinetic and current helicity, while the other model (helical) has nonzero kinetic and current helicity. The velocity modes are forced in both these models. These low-dimensional models exhibit a dynamo transition at a critical forcing amplitude that depends on the Prandtl number. In the nonhelical model, dynamo exists only for magnetic Prandtl number beyond 1, while the helical model exhibits dynamo for all magnetic Prandtl number. Although the model is far from reproducing all the possible features of dynamo mechanisms, its simplicity allows a very detailed study and the observed dynamo transition is shown to bear similarities with recent numerical and experimental results.

• 出版日期2008-9