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Implementation of Radiation, Ablation, and Free Energy Minimization in Hypersonic Simulations

机译:高超声速模拟中辐射,消融和自由能最小化的实现

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A description of models and boundary conditions required for loose coupling of radiation and ablation physics to a hypersonic flow simulation is provided. Chemical equilibrium routines for varying elemental mass fractions are required in the flow solver to integrate with the equilibrium chemistry assumption employed in the ablation models. The capability also enables an equilibrium catalytic wall boundary condition in the nonablating case. The paper focuses on numerical implementation issues using FIRE II, Mars return, and Apollo 4 applications to provide context for discussion. Variable relaxation factors applied to the Jacobian elements of partial equilibrium relations required for convergence are defined. Challenges of strong radiation coupling in a shock capturing algorithm are addressed. Results are presented to show how the current suite of models responds to a wide variety of conditions involving coupled radiation and ablation.
机译:提供了辐射和烧蚀物理与高超声速流模拟松散耦合所需的模型和边界条件的描述。在流动求解器中需要用于改变元素质量分数的化学平衡程序,以与消融模型中采用的平衡化学假设相结合。在非烧蚀的情况下,该功能还可以实现平衡的催化壁边界条件。本文重点讨论了使用FIRE II,火星回归和Apollo 4应用程序的数值实现问题,以提供讨论的背景。定义了收敛到局部平衡关系的雅可比元素的可变松弛因子。解决了震动捕捉算法中强辐射耦合的挑战。结果显示了当前的模型套件如何对涉及耦合辐射和消融的多种条件做出反应。

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