Implementation and Validation of a Geometric Advection Scheme in a CLSVOF Solver

In this work, a Coupled Level Set and Volume of Fluid (CLSVOF) solver using a geometric advection scheme is proposed and implemented. By improving droplet advection fidelity compared to existing methods, a reduction in the cost of characterising liquid breakup can be achieved, contributing to better fuel atomisation in propulsion systems. Validation of the solver is performed using a simple bubble advection case, where improved performance and field error compared to an algebraic CLSVOF implementation is noted. Verification is performed by replicating a planar airblast atomiser experiment. Here, good agreement with experimental results on breakup dynamics is observed along with clear improvement in droplet advection fidelity compared to algebraic methods. A comparison with a geometric VoF solver shows similar performance and accuracy due to the high Weber number flow. The isoCLSVOFFoam solver presented in this work presents a promising alternative to existing CLSVOF codes, particularly when good droplet resolution and surface tension modelling are required.