%0 Journal Article
%T Numerical Study of the Instability Patterns Between Counter Rotating Disks
%A L. Djamil
%J Journal of Engineering and Applied Sciences
%D 2012
%I 
%X The flow between counter-rotating disks for aspect ratio R/h = 7, is investigated numerically. This flow gives rise to a new instability pattern, a circular chain of vortices connected to the boundary layers trough spiral arms. The physical mechanism for this instability is elucidated: the balance between the centrifugal effects of each rotating disk results in the detachment of the boundary layer over the slower rotating disk, leading to a free shear layer in the bulk of the flow, witch becomes unstable via a Kelvin-helmholtz-type instability.
%U http://www.medwellonline.net/abstract/?doi=jeasci.2008.1.6