Interface and surface tension in incompressible lattice Boltzmann multiphase model Original Research Article

This paper studies the interfacial dynamics and surface tension in an incompressible lattice Boltzmann multiphase model proposed recently by He et al. [J. Comput. Phys. 152 (1999) 642]. The model tracks different phases and the interface between them using an index fluid with molecular interaction. When the molecular interaction is strong enough, the index fluid automatically segregates into two different phases. The surface tension is implemented in the model using a term as a function of the gradient of the index fluid density. The strength of the surface tension depends on the molecular interaction, and can be adjusted conveniently by a free parameter. Numerical simulations for a variety of flow conditions with surface tension are carried out to demonstrate the capability of the model.