三维辐射转移框架：IV。球柱坐标系
A 3D radiative transfer framework: IV. spherical & cylindrical coordinate systems
摘要：
我们扩展我们的框架三维辐射转移计算与非本地运营商分裂方法沿（全）的特点，球面和柱面坐标系。这些坐标系比笛卡尔坐标系更适合于许多物理问题。通过算子分裂（OS）技术解决线传输的散射问题。正式的解决方案是基于全特征的方法。构造了精确考虑最近邻的近似$Λ$算子。使用MPI库在波长和立体角上并行化代码。我们给出了针对不同坐标系具有不同热化参数值的几个测试案例的结果。结果直接比较一维平面平行测试。3D结果与经过良好测试的1D计算非常吻合。
英文摘要：
We extend our framework for 3D radiative transfer calculations with a non-local operator splitting methods along (full) characteristics to spherical and cylindrical coordinate systems. These coordinate systems are better suited to a number of physical problems than Cartesian coordinates. The scattering problem for line transfer is solved via means of an operator splitting (OS) technique. The formal solution is based on a full characteristics method. The approximate $Λ$ operator is constructed considering nearest neighbors exactly. The code is parallelized over both wavelength and solid angle using the MPI library. We present the results of several test cases with different values of the thermalization parameter for the different coordinate systems. The results are directly compared to 1D plane parallel tests. The 3D results agree very well with the well-tested 1D calculations.
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