Radiation Forcing

AstroBEAR now (2016) can calculate radiative transfer from single luminous object. Radiative transfer in AstroBEAR is first used in this research.

​Mass Transfer and Disk Formation in AGB Binary Systems

We apply 2D ray tracing algorithm in radiative transfer calculation. Radiation will transfer momentum (exert radiation force on fluid) without energy transfer. Therefore, we are solving the following equation.

\frac{\partial\rho}{\partial t}+\nabla\cdot\left(\rho\mathbf{u}\right)=0

\frac{\partial\rho\mathbf{u}}{\partial t}=-\nabla P