Cosmological radiative transfer codes comparison project – I. The static density field tests
Cosmological radiative transfer codes comparison project – I. The static density field tests
复制标题
DOI：
10.1111/j.1365-2966.2006.10775.x
复制
发表时间：
2006-03
影响因子：
4.8
通讯作者：
I. Iliev;B. Ciardi;M. Alvarez;A. Maselli;A. Ferrara;N. Gnedin;G. Mellema;T. Nakamoto;M. Norman;A. Razoumov;E. Rijkhorst;J. Ritzerveld;P. Shapiro;H. Susa;M. Umemura;D. J. W. Cita;Mpi;UTexas;Sissa;Fermilab;UChicago;Astron;Leiden Obs.;UTsukuba;U. Diego;Oak Ridge Natl. Lab.;Rikkyo U. Lanl
中科院分区：
文献类型：
--
作者：
I. Iliev;B. Ciardi;M. Alvarez;A. Maselli;A. Ferrara;N. Gnedin;G. Mellema;T. Nakamoto;M. Norman;A. Razoumov;E. Rijkhorst;J. Ritzerveld;P. Shapiro;H. Susa;M. Umemura;D. J. W. Cita;Mpi;UTexas;Sissa;Fermilab;UChicago;Astron;Leiden Obs.;UTsukuba;U. Diego;Oak Ridge Natl. Lab.;Rikkyo U. Lanl
辐射传输（RT）模拟现在处于数值天体物理学的前沿。它们对越来越多的天体物理学和宇宙学问题变得至关重要;同时，它们的计算成本已经达到目前可用的计算能力。进一步的进展是由相当数量的不同的算法（包括各种口味的光线跟踪和时刻计划）开发，这使得选择最合适的技术为一个给定的问题是一个不平凡的任务。本文的主要目的是评估这些方案的有效性范围，精度和性能，为此，我们比较了11个独立的RT代码在五个测试问题：（0）基础物理;（1）等温H II区膨胀;（2）H II区膨胀与演变的温度;（3）I-前捕获和阴影的致密团块和（4）在宇宙密度场的多个源。这些测试的输出进行了比较和差异分析。各种规范之间的一致性令人满意，但并非完美。的主要来源的差异似乎驻留在多频处理方法，导致不同厚度的电离中性过渡区和温度结构。目前的结果和测试代表了最完整的基准，可用于开发新的代码和改进现有的。为了进一步实现这一目标，所有测试输入和输出都以数字形式公开提供。
Radiative transfer (RT) simulations are now at the forefront of numerical astrophysics. They are becoming crucial for an increasing number of astrophysical and cosmological problems; at the same time their computational cost has come within reach of currently available computational power. Further progress is retarded by the considerable number of different algorithms (including various flavours of ray tracing and moment schemes) developed, which makes the selection of the most suitable technique for a given problem a non-trivial task. Assessing the validity ranges, accuracy and performances of these schemes is the main aim of this paper, for which we have compared 11 independent RT codes on five test problems: (0) basic physics; (1) isothermal H II region expansion; (2) H II region expansion with evolving temperature; (3) I-front trapping and shadowing by a dense clump and (4) multiple sources in a cosmological density field. The outputs of these tests have been compared and differences analysed. The agreement between the various codes is satisfactory although not perfect. The main source of discrepancy appears to reside in the multifrequency treatment approach, resulting in different thicknesses of the ionized-neutral transition regions and the temperature structure. The present results and tests represent the most complete benchmark available for the development of new codes and improvement of existing ones. To further this aim all test inputs and outputs are made publicly available in digital form.