SPH中的动态蒙特卡罗辐射传递。辐射压力实施
Dynamic Monte Carlo radiation transfer in SPH. Radiation pressure force implementation
摘要：
我们提出了一个新的框架辐射流体动力学模拟。气体动力学模型的平滑粒子流体动力学（SPH）方法，而辐射传输模拟通过随时间变化的蒙特卡罗方法，跟踪光子包。作为该方法发展的第一步，在本文中，我们考虑辐射场和气体之间的动量传递，这对于辐射压力高的系统是很重要的。对辐射源的数量、几何形状或可以用该方法研究的问题的光学深度没有基本限制。然而，正如任何蒙特卡罗转移方案所预期的那样，随机噪声带来了严重的限制。我们提出了一些测试表明，该方法的误差可以准确地估计，通过考虑泊松噪声波动的光子包的数量，SPH粒子相互作用，每个动态时间。结果发现，对于一个合理的精度的光子包所携带的动量必须远远小于一个典型的SPH粒子的动量。我们讨论的代码的数值限制，以及未来可以采取的措施，以提高性能和适用性的方法。
英文摘要：
We present a new framework for radiation hydrodynamics simulations. Gas dynamics is modelled by the Smoothed Particle Hydrodynamics (SPH) method, whereas radiation transfer is simulated via a time-dependent Monte-Carlo approach that traces photon packets. As a first step in the development of the method, in this paper we consider the momentum transfer between radiation field and gas, which is important for systems where radiation pressure is high. There is no fundamental limitations on the number of radiation sources, geometry or the optical depth of the problems that can be studied with the method. However, as expected for any Monte-Carlo transfer scheme, stochastic noise presents a serious limitation. We present a number of tests that show that the errors of the method can be estimated accurately by considering Poisson noise fluctuations in the number of photon packets that SPH particles interact with per dynamical time. It is found that for a reasonable accuracy the momentum carried by photon packets must be much smaller than a typical momentum of SPH particles. We discuss numerical limitations of the code, and future steps that can be taken to improve performance and applicability of the method.
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