首页 | 本学科首页   官方微博 | 高级检索  
     


Simulating the Kinematic Dynamo Forced by Heteroclinic Convective Velocity Fields
Authors:I. Oprea  P. Chossat  D. Armbruster
Affiliation:(1) I.N.L.N., C.N.R.S. and Université de Nice-Sophia Antipolis, US;(2) Department of Mathematics, Arizona State University, Tempe, AZ 83287-1804, U.S.A., US
Abstract:We report on the integration of the kinematic dynamo problem in a spherical domain forced by velocity fields that are convective fluid flows resulting from a bifurcation analysis of the spherical Bénard problem. We derive a code based on generalized spherical harmonics that ensures a divergence-free magnetic field. We determine the growth or decay of a magnetic field in the kinematic dynamo equation for various physically relevant velocity fields which are stationary as well as time-periodic and chaotic. Velocity signals that are produced by heteroclinic cycles are used as an input to an energy-saturated kinematic dynamo equation that limits the growth of the linearly unstable modes. Preliminary calculations indicate the possibility of reversals of the magnetic field for this case of forcing. Received 8 October 1996 and accepted 28 April 1997
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号