1. NUMERICAL SIMULATIONS OF AIRFLOW THROUGH 8m ENCLOSURES
Dr. David DeYoung
National Optical Astronomy Observatory

2. ISSUES Turbulence And Seeing Windshake And Loading
Flushing Of Mirror Surface
Previous Work
Site Evaluation, Mauna Kea and Cerro Pachón
Wind Loading of Mirror & Cell

3. VIRTUES Supplements Water Tunnel Tests
Arbitrary Wind Direction And Speed
Can Cover Large Area And Volume

4. NUMERICAL SIMULATIONS
Three Dimensional
High Reynolds Number
Steady State
Incompressible
Executed on Cray C90 at San Diego Supercomputer Center

5. Numerical model dimensions (enclosure)

23. SUMMARY Flow in dome mostly laminar Best flow when wind through vents
Low flow speeds near secondary
Good flushing at 11 m/s
Results do not scale for wind normal to vents