>
Fa   |   Ar   |   En
   a wall effects and means of controlling the evolution of swirling flows with vortex breakdown  
   
نویسنده meziane a. ,hachemi m. ,kessal m. ,imoula m.
منبع journal of applied fluid mechanics - 2023 - دوره : 16 - شماره : 11 - صفحه:2277 -2289
چکیده    This paper investigates numerically the bubble-type vortex breakdown apparition in the case of closed rotating flows of a viscous, axisymmetric, and incompressible fluid. first, a truncated conical/cylindrical cavity of spherical end disks is used to simulate and analyze the vortex structure under rigid surface conditions. the geometric effects of the enclosure are also studied. vortex breakdown is demonstrated beyond the lower disk rotation rate threshold by introducing the no-slip condition imposed on the upper wall. the objective is to explore ways of controlling the evolution of this physical event by modifying the confinement conditions upstream of the vortex rupture. particular attention is also paid to the effective kinematic viscosity, thermal diffusivity and geometric control of recirculation zones on the axis of rotation (axial bubble type). the second geometry consists of a spherical annulus formed by two concentric hemispheres in differential rotation under plat-free surface conditions. the results show that rotation of the inner hemisphere induces a vortex bubble on the polar axis. in contrast, the outer hemisphere rotation induces a toroidal vortex on the equator.
کلیدواژه vortex breakdown ,spherical gap spaces ,means of control ,rotating disks ,kinematical control ,boundary effects
آدرس m’hamed bougara boumerdes university, dynamique des moteurs et vibroacoustique laboratory, algeria, m’hamed bougara boumerdes university, mécanique et ingénieries laboratory, algeria, m’hamed bougara boumerdes university, géniephysique des hydrocarbures laboratory, algeria, m’hamed bougara boumerdes university, dynamique des moteurs et vibroacoustique laboratory, algeria
پست الکترونیکی imoulamalika@yahoo.fr
 
     
   
Authors
  
 
 

Copyright 2023
Islamic World Science Citation Center
All Rights Reserved