Lift, drag and added mass of a hemispherical bubble sliding and growing on a wall in a viscous linear shear flow.
The three-dimensional flow around a hemispherical bubble sliding and growing on a wall in a viscous linear shear flow is studied numerically by solving the full Navier-Stokes equations in a boundary-fitted domain. The main goal of the present study is to provide a complete description of the forces experienced by the bubble (drag, lift and added mass) over a wide range of sliding and shear Reynolds numbers (0.01<or=R(eb), R(ealpha)<or=2000) and shear rate (0<or=Sr<or=5). The drag and lift forces are computed successively for the following situations: an immobile bubble in a linear shear flow; a bubble sliding on the wall in a fluid at rest; and a bubble sliding in a linear shear flow. The added-mass force is studied by considering an unsteady motion relative to the wall or a time-dependent radius.
Legendre
Dominique
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Institut de Mécanique des Fluides de Toulouse, 2 Allée Camille Soula, 31400 Toulouse, France. legendre@imfr.fr
Colin
Catherine
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Coquard
Typhaine
T