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Proceedings Paper

Aero-thermal modeling framework for TMT
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Paper Abstract

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.

Paper Details

Date Published: 10 November 2011
PDF: 9 pages
Proc. SPIE 8336, Integrated Modeling of Complex Optomechanical Systems, 83360C (10 November 2011); doi: 10.1117/12.915515
Show Author Affiliations
Konstantinos Vogiatzis, Thirty Meter Telescope Observatory Corp. (United States)

Published in SPIE Proceedings Vol. 8336:
Integrated Modeling of Complex Optomechanical Systems
Torben Andersen; Anita Enmark, Editor(s)

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