发表机构
Center for Computational Astrophysics, National Astronomical Observatory of Japan; Astronomical Science Program, The Graduate University for Advanced Studies (SOKENDAI)（日本国立天文台计算天体物理中心; 高级研究院（SOKENDAI）天文学项目）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对尘埃 - 气体双流体模拟，开发可与HLLD气体求解器耦合的分裂通量方法，解决强耦合下尘埃与气体质量比的人为变化问题，在抑制此变化的同时保留HLLD求解器低数值扩散率。
AI 中文摘要
我们开发了一种新方法来模拟通过尘埃 - 气体阻力与磁流体动力学气体耦合的无压中性尘埃流体。有人指出，在强耦合状态下，当尘埃和气体用独立数值通量演化时，尘埃 - 气体多流体方法在尘埃与气体质量比上存在人为变化。此问题源于尘埃和气体质量通量的不一致。在强耦合极限下，尘埃与气体质量比随局部气体速度平流。最近提出了一种基于Harten - Lax - van Leer（HLL）求解器的新方法，该方法构造尘埃质量通量使其与气体质量通量一致，成功减少了尘埃与气体质量比的人为变化。在此，我们开发了一种可与HLLD气体求解器耦合的分裂通量方法。通过各种数值实验，我们表明分裂通量方法抑制了尘埃与气体质量比的人为变化，同时保留了HLLD求解器的低数值扩散率。
英文摘要
We develop a new method for simulating pressureless fluids of neutral dust coupled to magnetohydrodynamic gas through dust-gas drag. It has been pointed out that, in the strong-coupling regime, dust-gas multifluid methods suffer from artificial variations in the dust-to-gas mass ratio when the dust and gas are evolved with independent numerical fluxes. This problem arises from inconsistencies between the dust and gas mass fluxes. In the strong-coupling limit, the dust-to-gas mass ratio is advected with the local gas velocity. Recently, a new method based on the Harten-Lax-van Leer (HLL) solver was proposed. This method constructs the dust mass flux so that it is consistent with the gas mass flux, and successfully reduces artificial variations in the dust-to-gas mass ratio. Here, we develop a Split-Flux method that can be coupled to an HLLD gas solver. Through various numerical experiments, we show that the Split-Flux method suppresses artificial variations in the dust-to-gas mass ratio, while preserving the low numerical diffusivity of the HLLD solver.
Comments16 pages, 10 figures, accepted for ApJ, comments are welcome
