11/26/01 NIO Workshop on Wind Modeling LMS

NIO Workshop on Wind Modeling

Welcome and Introduction

Larry Stepp

11/26/01 NIO Workshop on Wind Modeling LMS

Agenda

November 26 - morning9:00 Welcome and introduction Larry Stepp

9:20 Gemini water tunnel testing Paul Gillett

9:40 The Gemini South wind loading study Myung Cho

10:10 Analysis of the Gemini data Oleg Likhatchev

10:50 Break

11:00 Previous CFD modeling of Gemini telescope and enclosure Dave DeYoung

11:30 Enclosures for Extremely Large Telescopes David Halliday

12:00 Lunch

11/26/01 NIO Workshop on Wind Modeling LMS

Agenda

November 26 - afternoon

1:00 Wind modeling studies at TSU Dr. Xu and/or Mark Whorton

1:30 What do we need to know for GSMT? George Angeli

2:00 Discussion of what we have learned so far about telescope wind loading

3:00 Break

3:20 Discussion of next efforts

5:00 Adjourn

6:30 Dinner

11/26/01 NIO Workshop on Wind Modeling LMS

Agenda

November 27 - morning9:00 Planning session for additional studies

11:00 Establish action items

12:00 Adjourn Workshop

Lunch

11/26/01 NIO Workshop on Wind Modeling LMS

Who we are

Space Telescope Science Institute

National Optical Astronomy Observatory

Gemini Observatory

National Solar Observatory

AURA New Initiatives Office

Association of Universities for Research in Astronomy

11/26/01 NIO Workshop on Wind Modeling LMS

NOAO

• Operates telescopes on Kitt Peak, Arizona and Cerro Tololo and Cerro Pachon, Chile

• Runs Time Allocation Committees that assign observing time to US Astronomers

• Develops new facilities for ground-based astronomy

11/26/01 NIO Workshop on Wind Modeling LMS

Gemini

• Gemini Observatory is an international partnership of 7 countries• United States• United Kingdom• Canada• Chile• Argentina• Brazil• Australia

11/26/01 NIO Workshop on Wind Modeling LMS

Gemini

• There are two Gemini telescopes, each 8 meters in diameter• Mauna Kea, Hawai’i• Cerro Pachon, Chile

11/26/01 NIO Workshop on Wind Modeling LMS

Background

• In the past, observatory domes were designed to shield the telescope from the wind as much as possible

• However, massive domes with minimal ventilation trapped heat• Degraded seeing

• Many telescopes of the current generation have vents to provide natural ventilation• Improved seeing• More concern about wind buffeting

11/26/01 NIO Workshop on Wind Modeling LMS

Background

• Observatories are interested in wind modeling for two reasons:• Understand seeing effects• Understand wind buffeting

• Many previous wind studies for existing telescopes were more concerned with seeing

• Plans for future extremely large telescopes depend on understanding wind buffeting

11/26/01 NIO Workshop on Wind Modeling LMS

GSMT

• NIO is developing design concepts for a 30-meter Giant Segmented Mirror Telescope

• Wind buffeting will be a key issue

11/26/01 NIO Workshop on Wind Modeling LMS

Goals for the Workshop

• Review previous wind flow studies of Gemini Telescopes

• Evaluate what has already been learned

• Identify key parameters involved in wind loading of telescopes

• Identify further studies on Gemini Telescopes to increase our understanding of wind loading on larger telescopes

• Set priorities for upcoming studies

• Reach agreement on division of labor for studies

11/26/01 NIO Workshop on Wind Modeling LMS

Agenda

November 26 - morning9:00 Welcome and introduction Larry Stepp

9:20 Gemini water tunnel testing Paul Gillett

9:40 The Gemini South wind loading study Myung Cho

10:10 Analysis of the Gemini data Oleg Likhatchev

10:50 Break

11:00 Previous CFD modeling of Gemini telescope and enclosure Dave DeYoung

11:30 Enclosures for Extremely Large Telescopes David Halliday

12:00 Lunch