Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones

Abstract Taking advantage of the huge computational power of a massive parallel supercomputer (K-supercomputer), this study conducts large eddy simulations of entire tropical cyclones by employing a numerical weather prediction model, and explores near-surface coherent structures. The maximum of the...

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Autores principales:	Junshi Ito, Tsutao Oizumi, Hiroshi Niino
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/be142c528c124aa892c979ce0532da50
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spelling	oai:doaj.org-article:be142c528c124aa892c979ce0532da502021-12-02T15:05:14ZNear-surface coherent structures explored by large eddy simulation of entire tropical cyclones10.1038/s41598-017-03848-w2045-2322https://doaj.org/article/be142c528c124aa892c979ce0532da502017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03848-whttps://doaj.org/toc/2045-2322Abstract Taking advantage of the huge computational power of a massive parallel supercomputer (K-supercomputer), this study conducts large eddy simulations of entire tropical cyclones by employing a numerical weather prediction model, and explores near-surface coherent structures. The maximum of the near-surface wind changes little from that simulated based on coarse-resolution runs. Three kinds of coherent structures appeared inside the boundary layer. The first is a Type-A roll, which is caused by an inflection-point instability of the radial flow and prevails outside the radius of maximum wind. The second is a Type-B roll that also appears to be caused by an inflection-point instability but of both radial and tangential winds. Its roll axis is almost orthogonal to the Type-A roll. The third is a Type-C roll, which occurs inside the radius of maximum wind and only near the surface. It transports horizontal momentum in an up-gradient sense and causes the largest gusts.Junshi ItoTsutao OizumiHiroshi NiinoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Junshi Ito Tsutao Oizumi Hiroshi Niino Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
description	Abstract Taking advantage of the huge computational power of a massive parallel supercomputer (K-supercomputer), this study conducts large eddy simulations of entire tropical cyclones by employing a numerical weather prediction model, and explores near-surface coherent structures. The maximum of the near-surface wind changes little from that simulated based on coarse-resolution runs. Three kinds of coherent structures appeared inside the boundary layer. The first is a Type-A roll, which is caused by an inflection-point instability of the radial flow and prevails outside the radius of maximum wind. The second is a Type-B roll that also appears to be caused by an inflection-point instability but of both radial and tangential winds. Its roll axis is almost orthogonal to the Type-A roll. The third is a Type-C roll, which occurs inside the radius of maximum wind and only near the surface. It transports horizontal momentum in an up-gradient sense and causes the largest gusts.
format	article
author	Junshi Ito Tsutao Oizumi Hiroshi Niino
author_facet	Junshi Ito Tsutao Oizumi Hiroshi Niino
author_sort	Junshi Ito
title	Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
title_short	Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
title_full	Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
title_fullStr	Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
title_full_unstemmed	Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
title_sort	near-surface coherent structures explored by large eddy simulation of entire tropical cyclones
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/be142c528c124aa892c979ce0532da50
work_keys_str_mv	AT junshiito nearsurfacecoherentstructuresexploredbylargeeddysimulationofentiretropicalcyclones AT tsutaooizumi nearsurfacecoherentstructuresexploredbylargeeddysimulationofentiretropicalcyclones AT hiroshiniino nearsurfacecoherentstructuresexploredbylargeeddysimulationofentiretropicalcyclones
_version_	1718388919154769920

Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones

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