A GENERAL HYBRID RADIATION TRANSPORT SCHEME FOR STAR FORMATION SIMULATIONS ON AN ADAPTIVE GRID
A GENERAL HYBRID RADIATION TRANSPORT SCHEME FOR STAR FORMATION SIMULATIONS ON AN ADAPTIVE GRID
复制标题
自适应网格上恒星形成模拟的通用混合辐射传输方案
DOI：
10.1088/0004-637x/797/1/4
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Lars Buntemeyer
中科院分区：
文献类型：
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作者：
M. Klassen;R. Kuiper;R. Pudritz;T. Peters;R. Banerjee;Lars Buntemeyer
辐射反馈在恒星形成过程中起着至关重要的作用。为了模拟年轻恒星星团周围的盘状、细丝状和分子气体的热力学演化，我们需要一种有效而准确的方法来求解辐射传递问题。本文描述了基于自适应网格的flash通用磁流体力学代码中混合辐射输运方案的实现。混合方案将辐射输运问题分解为射线追踪和扩散两个步骤。当恒星照射它们的环境时，射线追踪器捕捉到第一个吸收事件，而辐射场的漫射成分的演变由通量限制扩散求解器处理。我们通过各种基准测试证明了我们的方法的准确性，包括静态磁盘的辐照，亚临界和超临界辐射冲击，以及热能平衡。我们还展示了我们的方法在多个恒星源存在的情况下投射阴影和计算气体和尘埃温度的能力。我们的方法能够在磁化的、丝状的环境中，对年轻的恒星物体、原恒星盘和星团形成进行辐射流体动力学研究。
Radiation feedback plays a crucial role in the process of star formation. In order to simulate the thermodynamic evolution of disks, filaments, and the molecular gas surrounding clusters of young stars, we require an efficient and accurate method for solving the radiation transfer problem. We describe the implementation of a hybrid radiation transport scheme in the adaptive grid-based flash general magnetohydrodyanmics code. The hybrid scheme splits the radiative transport problem into a raytracing step and a diffusion step. The raytracer captures the first absorption event, as stars irradiate their environments, while the evolution of the diffuse component of the radiation field is handled by a flux-limited diffusion solver. We demonstrate the accuracy of our method through a variety of benchmark tests including the irradiation of a static disk, subcritical and supercritical radiative shocks, and thermal energy equilibration. We also demonstrate the capability of our method for casting shadows and calculating gas and dust temperatures in the presence of multiple stellar sources. Our method enables radiation-hydrodynamic studies of young stellar objects, protostellar disks, and clustered star formation in magnetized, filamentary environments.