Computational techniques for fluid dynamics
Computational techniques for fluid dynamics
A continuum method for modeling surface tension
Journal of Computational Physics
Modelling merging and fragmentation in multiphase flows with SURFER
Journal of Computational Physics
PROST: a parabolic reconstruction of surface tension for the volume-of-fluid method
Journal of Computational Physics
A numerical method for two-phase flows of dense granular mixtures
Journal of Computational Physics
Generalized formulations for the Rhie-Chow interpolation
Journal of Computational Physics
Hi-index | 31.46 |
Discontinuities in the body force field typically appear at the interface of two fluid systems. Modeled with the volume-of-fluid (VOF) and discretized with the finite volume method, the discontinuous body force fields are represented as abruptly variable. In the present study, gravity and continuum surface force (CSF) are considered. Such strongly variable body forces can produce unphysical spikes in the velocity field when collocated variable arrangement is used. The spikes can be eliminated following a force field discretization rule which is deduced by imposing a constraint requiring a zero velocity solution when the forces applied to the system are equilibrated with the gradient of the pressure field. It is shown (as a byproduct of the present work) that a zero velocity solution can only be obtained if the force field is conservative on the discrete level, which applies also for the studied case of a stationary bubble. Finally, the case of a rising bubble demonstrates that the proposed rule should be obeyed generally although it is obtained for a quiescent fluid.