Numerical study of falling film on flexible wall in the presence of insoluble surfactant

Abstract eng:
The dynamics of falling film down an inclined flexible wall have been studied by means of a numerical simulation, in which the algorithm is based on marker and cell (MAC) method. The free surface of liquid film is occupied by insoluble surfactant. The equations governing the fluid motion are discretized on a semi-staggered grid fixed on a physical space. The interfacial boundary conditions on the free surface are treated with the donor cell method. The displacement of flexible wall are treated according to the conservation of mass for liquid film. The surfactant evolution is simulated by separating the convection and diffusion into two steps. Simulation results indicate that the surfactant acts to suppress the dispersion of interfacial wave. Both the wall damping and tension acts to suppress the fluctuations of the flexible wall. However, they play different roles in the evolution of the liquid-air interface.

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