A Dual Scale Approach to Large Eddy Simulations of Interfaces with Phase Change

A method to predict the sub-filter interfacial velocity of a liquid-gas phase interface with phase change for use in a dual scale Large Eddy Simulation (LES) model is presented. The method reconstructs the sub-filter velocity field on a Refined Local Surface Grid (RLSG) coaligned with the LES flow solver grid in a narrow band near the interface. Due to the mass transfer through the interface, the proposed model advects the phase interface normal to itself using the fully resolved interface normal vector available on the dual scale. The interface is transported with an unsplit geometric Volume-of-Fluid scheme using PLIC reconstruction and ELVIRA estimated normals to represent the interface. The dual scale method is tested and compared against DNS of a triply periodic box of decaying Homogeneous Isotropic Turbulence with an initially planar interface centered in the box.