论文标题
使用实验室天体物理喷气机的辐射液动力学功能的代码对代码比较和验证
Code-to-Code Comparison and Validation of the Radiation-Hydrodynamics Capabilities of the FLASH Code Using a Laboratory Astrophysical Jet
论文作者
论文摘要
激光生产的等离子体的潜力可以通过使用放射线流动力学代码对这些等离子体的特性和行为进行建模时的不确定性来挫败高能密度物理（HEDP）并提供其他有用应用的基本见解。为了克服这一点，并在公开可用的闪光辐射流动力法规中证实了HEDP功能的准确性，我们使用先前发表的Hydra Simulations在Lawrence Livermore国家实验室开发的Flash与Hydra代码之间进行了详细的代码对代码比较。 （2008）。该研究描述了一项激光实验，该实验产生了类似喷射的特征，作者与天体物理喷气机相比。重要的是，Grava等人。 （2008）实验包括对电子密度的详细X射线干涉测量以及软X射线光谱的时间集成度测量。尽管用于处理计算网格的方法明显不同，并且状态和不透明度模型的不同方程式，但闪光的结果类似于Hydra的结果，最重要的是，电子密度的实验测量值。以这种方式验证了闪存代码后，我们使用该代码进一步调查和理解Grava等人中看到的喷气机的形成。 （2008）实验并讨论其与Wan等人的关系。 （1997）在Nova Laser进行的实验。
The potential for laser-produced plasmas to yield fundamental insights into high energy density physics (HEDP) and deliver other useful applications can sometimes be frustrated by uncertainties in modeling the properties and behavior of these plasmas using radiation-hydrodynamics codes. In an effort to overcome this and to corroborate the accuracy of the HEDP capabilities in the publicly available FLASH radiation-hydrodynamics code, we present detailed code-to-code comparisons between FLASH and the HYDRA code developed at Lawrence Livermore National Laboratory using previously published HYDRA simulations from Grava et al. (2008). That study describes a laser experiment that produced a jet-like feature that the authors compare to astrophysical jets. Importantly, the Grava et al. (2008) experiment included detailed x-ray interferometric measurements of electron number densities and a time-integrated measurement of the soft x-ray spectrum. Despite markedly different methods for treating the computational mesh, and different equation of state and opacity models, the FLASH results resemble the results from HYDRA and, most importantly, the experimental measurements of electron density. Having validated the FLASH code in this way, we use the code to further investigate and understand the formation of the jet seen in the Grava et al. (2008) experiment and discuss its relation to the Wan et al. (1997) experiment at the NOVA laser.
