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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2017-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-017-03848-w |
| _version_ | 1819039985783799808 |
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| author | Junshi Ito Tsutao Oizumi Hiroshi Niino |
| author_facet | Junshi Ito Tsutao Oizumi Hiroshi Niino |
| author_sort | Junshi Ito |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-21T09:01:54Z |
| format | Article |
| id | doaj.art-be142c528c124aa892c979ce0532da50 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-21T09:01:54Z |
| publishDate | 2017-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-be142c528c124aa892c979ce0532da502022-12-21T19:09:27ZengNature PortfolioScientific Reports2045-23222017-06-017111010.1038/s41598-017-03848-wNear-surface coherent structures explored by large eddy simulation of entire tropical cyclonesJunshi Ito0Tsutao Oizumi1Hiroshi Niino2Meteorological Research InsitituteJapan Agency for Marine-Earth Science and TechnologyAtmosphere and Ocean Research Institute, The University of TokyoAbstract 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.https://doi.org/10.1038/s41598-017-03848-w |
| spellingShingle | Junshi Ito Tsutao Oizumi Hiroshi Niino Near-surface coherent structures explored by large eddy simulation of entire tropical cyclones Scientific Reports |
| title | 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_short | 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 |
| url | https://doi.org/10.1038/s41598-017-03848-w |
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