A HYDROCHEMICAL HYBRID CODE FOR ASTROPHYSICAL PROBLEMS. I. CODE VERIFICATION AND BENCHMARKS FOR A PHOTON-DOMINATED REGION (PDR)
A HYDROCHEMICAL HYBRID CODE FOR ASTROPHYSICAL PROBLEMS. I. CODE VERIFICATION AND BENCHMARKS FOR A PHOTON-DOMINATED REGION (PDR)
复制标题
天体物理问题的水化学混合代码。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
T. Hasegawa
中科院分区：
文献类型：
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作者：
K. Motoyama;O. Morata;H. Shang;R. Krasnopolsky;T. Hasegawa
一个二维水化学混合代码，KM 2，构造处理天体物理问题，将需要耦合的流体动力学和化学演化。该代码假设在圆柱坐标系轴对称，并由两个模块组成：流体力学模块和化学模块。流体动力学模块使用Godunov型有限体积方案求解流体动力学，并将所包含的化学物质视为被动平流标量。化学模块隐含地解决了非平衡化学和能量变化，由于热过程与外部紫外线辐射的转移。自屏蔽效应对CO和H2的光解离的影响。在这篇介绍性的论文中，所采用的数值方法，沿着代码验证使用的流体力学模块和基准的化学模块与特定的光子主导区域（PDR）的反应。最后，作为一个例子，预期的能力，水化学演变的PDR的PDR基准的基础上。
A two-dimensional hydrochemical hybrid code, KM2, is constructed to deal with astrophysical problems that would require coupled hydrodynamical and chemical evolution. The code assumes axisymmetry in a cylindrical coordinate system and consists of two modules: a hydrodynamics module and a chemistry module. The hydrodynamics module solves hydrodynamics using a Godunov-type finite volume scheme and treats included chemical species as passively advected scalars. The chemistry module implicitly solves nonequilibrium chemistry and change of energy due to thermal processes with transfer of external ultraviolet radiation. Self-shielding effects on photodissociation of CO and H2 are included. In this introductory paper, the adopted numerical method is presented, along with code verifications using the hydrodynamics module and a benchmark on the chemistry module with reactions specific to a photon-dominated region (PDR). Finally, as an example of the expected capability, the hydrochemical evolution of a PDR is presented based on the PDR benchmark.