NUMERICAL SIMULATIONS OF AIRFLOW THROUGH 8m ENCLOSURES

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Presentation transcript:

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

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

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

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

Numerical model dimensions (enclosure)

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