Computational fluid dynamics modeling of GMT

Konstantinos Vogiatzis; Kaushik Das; George Angeli; Bruce Bigelow; Will Burgett

doi:10.1117/12.2312858

10 July 2018 Computational fluid dynamics modeling of GMT

Konstantinos Vogiatzis, Kaushik Das, George Angeli, Bruce Bigelow, Will Burgett

Proceedings Volume 10705, Modeling, Systems Engineering, and Project Management for Astronomy VIII; 107050R (2018) https://doi.org/10.1117/12.2312858
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

A detailed Computational Fluid Dynamics (CFD) model for the Giant Magellan Telescope (GMT) telescope has been developed and used to simulated and analyze the aero-optical environment around the observatory. The developed model accounts for the major observatory components such as the primary (M1) and secondary (M2) mirrors, the M2 supporting truss, other subcomponents of the telescope mount, and enclosure building along with the auxiliary and site support buildings on the summit. A large topographical area around the installation site is included. This study evaluates three different lower enclosure designs; a closed soffit, an open soffit and a perforated ring-wall (partially closed soffit). Timevarying CFD simulations provide detailed flow and temperature fields along the optical path, which are subsequently used to compute optical parameters such as Optical Path Difference (OPD) maps and Point Source Sensitivity normalized (PSSn), the GMT Image Quality (IQ) metric. Results show that enclosure-induced turbulent flow patterns and refractive index variations have a greater influence on optical performance compared to flow and thermal behavior external to the enclosure. Instantaneous and mean PSSn values obtained for the three soffit configurations show minor differences, indicating that the lower enclosure design has minimal impact on observatory optical performance for the simulated operating conditions.

Conference Presentation

Citation Download Citation

Konstantinos Vogiatzis, Kaushik Das, George Angeli, Bruce Bigelow, and Will Burgett "Computational fluid dynamics modeling of GMT", Proc. SPIE 10705, Modeling, Systems Engineering, and Project Management for Astronomy VIII, 107050R (10 July 2018); https://doi.org/10.1117/12.2312858

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