Axisymmetric simulation of the interaction of a rising bubble with a rigid surface in viscous flow

Abstract The interaction between a rising deformable gas bubble and a solid wall in viscous liquids is investigated by direct numerical simulation via an arbitrary-Lagrangian–Eulerian (ALE) approach. The flow field is assumed to be axisymmetric. The bubble is driven by gravity only and the motion of the gas inside the bubble is neglected. Deformation of the bubble is tracked by a moving triangular mesh and the liquid motion is obtained by solving the Navier–Stokes equations in a finite element framework. To understand the mechanisms of bubble deformation as it interacts with the wall, the interaction process is studied as a function of two dimensionless parameters, namely, the Morton number ( Mo ) and Bond number ( Bo ). We study the range of Bo and Mo from (2, 6.5 × 10 −6 ) to (16, 0.1). The film drainage process is also considered in this study. It is shown that the deformation of a bubble interacting with a solid wall can be classified into three modes depending on the values of Mo and Bo .

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