This file implements the time integration of a system of stochastic differential equations (SDEs) with linear drift and quadratic diagonal diffusion, whose invariant is the joint beta distribution. The main difference compared to the plain beta SDE (see DiffEq/Beta.h), is that in the mass-fraction beta SDE the dependent variable, there are two additional stochastic variables computed from the beta variables.
In a nutshell, the equation integrated governs a set of scalars, , , as
In addition to integrating the above SDE, there are two additional functions of are computed as
These equations compute the instantaneous mixture density, , and instantaneous specific volume, , for equation in the system. These quantities are used in binary mixing of variable-density turbulence between two fluids with constant densities, and . The additional parameters, and are user input parameters and kept constant during integration. Since we compute the above variables, and , and call them mixture density and specific volume, respectively, , governed by the beta SDE is a mass fraction, hence the name mass-fraction beta.
All of this is unpublished, but will be linked in here once published.
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