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Aero-thermal modeling framework for TMT

机译：TMT的空气热模型框架

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摘要

The Performance Error Budget of the Thirty Meter Telescope (TMT) suggests that nearly one third of the total image degradation is due to aero-thermal disturbances (mirror and dome seeing, dynamic wind loading and thermal deformations of the optics, telescope structure and enclosure). An update of the current status of aero-thermal modeling and Computational Fluid-Solid Dynamics (CFSD) simulations for TMT is presented. A fast three-dimensional transient conduction-convection-radiation bulk-air-volume model has also been developed for the enclosure and selected telescope components in order to track the temperature variations of the surfaces, structure and interstitial air over a period of three years using measured environmental conditions. It is used for Observatory Heat Budget analysis and also provides estimates of thermal boundary conditions required by the CFD/FEA models and guidance to the design. Detailed transient CFSD conjugate heat transfer simulations of the mirror support assemblies determine the direction of heat flow from important heat sources and provide guidance to the design. Finally, improved CFD modeling is used to calculate wind forces and temperature fields. Wind loading simulations are demonstrated through TMT aperture deflector forcing. Temperature fields are transformed into refractive index ones and the resulting Optical Path Differences (OPDs) are fed into an updated thermal seeing model to estimate seeing performance metrics. Keck II simulations are the demonstrator for the latter type of modeling.
机译：三十米望远镜（TMT）的性能误差预算表明，将近三分之一的总图像质量下降是由于空气热干扰（镜面和圆顶观测，动态风载荷和光学元件，望远镜结构和外壳的热变形）引起的。提出了用于TMT的空气热模型和计算流体-固体动力学（CFSD）模拟的当前状态的更新。还为外壳和选定的望远镜组件开发了快速的三维瞬态传导-对流辐射辐射大风量模型，以便在三年的时间内跟踪表面，结构和间隙空气的温度变化，方法是使用测量的环境条件。它用于天文台热量收支分析，还提供CFD / FEA模型所需的热边界条件估计以及设计指南。镜子支撑组件的详细瞬态CFSD共轭传热模拟确定了重要热源的热流方向，并为设计提供了指导。最后，改进的CFD建模用于计算风力和温度场。通过TMT孔径偏转器强迫展示了风荷载模拟。将温度场转换为折射率场，并将所得的光程差（OPD）馈入更新的热导模型中，以估计导视性能指标。 Keck II仿真是后一种建模的演示者。

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