For transient simulations that use the pressure-based solver, it is possible to specify that the model equations are solved in an order that is optimized for volumetric expansion when using the following multiphase models:
the Volume of Fluid (VOF) model
the Mixture model
This ordering can improve the speed of convergence for flows in which the density is strongly dependent on thermal effects, chemical composition, and so on (such as combustion simulations).
To use this optimized ordering in such circumstances, select the transient, pressure-based solver, select the appropriate multiphase model, enable beta feature access (as described in Introduction), and enter the following text command:
> solve/set/equation-ordering Equation Order [standard]>--> optimized-for-volumetric-expansion