TY  - JOUR
T1  - Numerical Study of the Instability Patterns Between Counter Rotating Disks
AU - , L. Djamil 
JO  - Journal of Engineering and Applied Sciences
VL  - 3
IS  - 1
SP  - 1
EP  - 6
PY  - 2008
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2008.1.6
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2008.1.6
KW  - Rotating flows
KW  -flow between disks
KW  -shear instability
KW  -pentagonal patterns
AB  - 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.
ER  -