A Two-Fluid Method for Ambipolar Diffusion
David A. Tilley, Dinshaw S. Balsara
TL;DR
This paper introduces a semi-implicit, second-order accurate two-fluid method for modeling ambipolar diffusion in astrophysical fluids, effectively capturing MHD wave propagation and shock structures.
Contribution
It presents a novel semi-implicit numerical scheme implemented in the RIEMANN code for accurate two-fluid ambipolar diffusion simulations.
Findings
The method accurately tracks MHD wave propagation.
It correctly models two-fluid C-shocks.
High accuracy is essential for capturing ion-neutral friction effects.
Abstract
We present a semi-implicit method for isothermal two-fluid ion-neutral ambipolar drift that is second-order accurate in space and time. The method has been implemented in the RIEMANN code for astrophysical fluid dynamics. We present four test problems that show the method works and correctly tracks the propagation of MHD waves and the structure of two-fluid C-shocks. The accurate propagation of MHD waves in the two-fluid approximation is shown to be a stringent test of the algorithm. We demonstrate that highly accurate methods are required in order to properly capture the MHD wave behaviour in the presence of ion-neutral friction.
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