Flow-3D v9.1(c) Flow Science Inc

Additions to Two-fluid Phase Change model. The two-fluid (liquid and compressible gas) evaporation/condensation model has been extended to allow condensation in pure gas and evaporation in pure liquid for both sharp and diffuse interface cases, and to enable preferential vapor nucleation (boiling) at walls.
Two-fluid Interface Slip model . When the two-fluid, sharp interface model is used, and the ratio of the densities of the two fluids is large (fluid #1 is heavier than fluid #2, like water and air), then velocities of the fluids at the interface can differ significantly. The newly-added interface slip model takes this into account improving accuracy and stability of the flow solution.

New Cavitation Potential model. This new model is designed to predict die erosion due to cavitation during filling in high pressure die casting. Metal pressure can drop several atmospheres below the metal vapor pressure in areas of very fast flow, possibly causing cavitation and erosion.

Surface Tension model enhancement. The accuracy of free surface curvature evaluation has been improved by including more fluid cells in the calculation. Additional improvements in free surface normal evaluation result in reduced noise in surface tension pressure. These enhancements, combined with the Split Lagrangian VOF method, improve the accuracy of the surface tension model in general.

Heat transfer solver improvement. The speed of the implicit solver for the heat transfer model has been increased by up to a factor of two. Convergence has also been improved. The explicit solver for the thermal conduction in fluids has also been optimized for speed.