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Paper Abstract
The performance requirements of the Thirty Meter Telescope (TMT) dictate, among others, a thorough understanding of
the flow field inside and around the observatory. Mirror and dome seeing as well as dynamic wind loading on the optics,
telescope structure and enclosure constitute significant sources of image degradation. A summary of the current status of
Computational Fluid Dynamics (CFD) simulations for TMT is presented, with special attention given to the choice of
thermal boundary conditions.
Detailed simulations of the mirror support assemblies determine the direction of heat flow from important heat sources
and provide feedback to the design. They also provide estimates of the heat transfer coefficients for the solid thermal
models.
A transient radiation model has also been developed for the enclosure and telescope surfaces in order to estimate the heat
flux exchange with the air volume. It also provides estimates of the effective emissivity for the solid thermal models.
Finally, a complete model of the observatory on a candidate summit is used to calculate air velocity, pressure and
temperature for a matrix of given telescope orientations and enclosure configurations. Calculated wind velocity spectra
above M1 and around M2 as well as the wind force on the enclosure are used as inputs in the TMT integrated dynamic
model. The temperature and flux output of the aforementioned thermal models are used as input surface boundary
conditions in the CFD model. Generated records of temperature variations inside the air volume of the optical paths are
fed into the TMT thermal seeing model.
Paper Details
Date Published: 7 July 2008
PDF: 11 pages
Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70170Q (7 July 2008); doi: 10.1117/12.787922
Published in SPIE Proceedings Vol. 7017:
Modeling, Systems Engineering, and Project Management for Astronomy III
George Z. Angeli; Martin J. Cullum, Editor(s)
PDF: 11 pages
Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70170Q (7 July 2008); doi: 10.1117/12.787922
Show Author Affiliations
Konstantinos Vogiatzis, TMT Observatory Corp. (United States)
Published in SPIE Proceedings Vol. 7017:
Modeling, Systems Engineering, and Project Management for Astronomy III
George Z. Angeli; Martin J. Cullum, Editor(s)
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