Large-Eddy Simulation of an Idealized Tropical Cyclone

Large-Eddy Simulation of an Idealized Tropical Cyclone INSIGHTS and INNOVATIONS Large-Eddy Simulation of an Idealized Tropical Cyclone BY R . ROTUNNO, Y. CHEN , W . WANG , C . DAVIS, J . DUDHIA, AND G . J . HOLLAND dvances in computing have allowed present- given sufficient resolution. Here we show that using day numerical weather-prediction models a horizontal grid size < 100 m in a TC simulation Ato forecast and/or simulate tropical cyclones produces three-dimensional turbulent eddies, which (TCs) with high resolution (horizontal grid spacing have the effect of decreasing the maximum sustained ~1 km). While these numerical models of TCs can (1-min average) wind and the maximum predicted capture many of their important structural features azimuthally averaged wind. (eyewall, rainbands, etc.), the effects of small-scale [~ 0 (100 m)], three-dimensional turbulence must TURBULENC E EFFECT S I N TROPICAL - still be parameterized. No objective basis has yet been CYCLON E MODELS . Existing tropical-cyclone found for such parameterizations, yet the maximum models need to simulate circulations reaching outward wind speeds in axisymmetric numerical TC models to a distance of ~ 0 (1,000 km) from the TC center. have been shown to be highly sensitive to the radial Modern-day computers have allowed real-time http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the American Meteorological Society American Meteorological Society

Large-Eddy Simulation of an Idealized Tropical Cyclone

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0477
D.O.I.
10.1175/2009BAMS2884.1
Publisher site
See Article on Publisher Site

Abstract

INSIGHTS and INNOVATIONS Large-Eddy Simulation of an Idealized Tropical Cyclone BY R . ROTUNNO, Y. CHEN , W . WANG , C . DAVIS, J . DUDHIA, AND G . J . HOLLAND dvances in computing have allowed present- given sufficient resolution. Here we show that using day numerical weather-prediction models a horizontal grid size < 100 m in a TC simulation Ato forecast and/or simulate tropical cyclones produces three-dimensional turbulent eddies, which (TCs) with high resolution (horizontal grid spacing have the effect of decreasing the maximum sustained ~1 km). While these numerical models of TCs can (1-min average) wind and the maximum predicted capture many of their important structural features azimuthally averaged wind. (eyewall, rainbands, etc.), the effects of small-scale [~ 0 (100 m)], three-dimensional turbulence must TURBULENC E EFFECT S I N TROPICAL - still be parameterized. No objective basis has yet been CYCLON E MODELS . Existing tropical-cyclone found for such parameterizations, yet the maximum models need to simulate circulations reaching outward wind speeds in axisymmetric numerical TC models to a distance of ~ 0 (1,000 km) from the TC center. have been shown to be highly sensitive to the radial Modern-day computers have allowed real-time

Journal

Bulletin of the American Meteorological SocietyAmerican Meteorological Society

Published: Dec 1, 2009

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