Evaluating Terrain as a Turbulence Generation Method

When driving microscale large-eddy simulations with mesoscale model solutions, turbulence will take space to develop, known as <i>fetch</i>, on the microscale domain. To reduce fetch, it is common to add perturbations near the boundaries to speed up turbulence development. However, when...

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Autores principales:	Patrick Hawbecker, Matthew Churchfield
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	turbulence terrain large-eddy simulation Technology T
Acceso en línea:	https://doaj.org/article/792122c919e345b9bda86e038d614c0d
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id	oai:doaj.org-article:792122c919e345b9bda86e038d614c0d
record_format	dspace
spelling	oai:doaj.org-article:792122c919e345b9bda86e038d614c0d2021-11-11T15:43:19ZEvaluating Terrain as a Turbulence Generation Method10.3390/en142168581996-1073https://doaj.org/article/792122c919e345b9bda86e038d614c0d2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6858https://doaj.org/toc/1996-1073When driving microscale large-eddy simulations with mesoscale model solutions, turbulence will take space to develop, known as <i>fetch</i>, on the microscale domain. To reduce fetch, it is common to add perturbations near the boundaries to speed up turbulence development. However, when simulating domains over complex terrain, it is possible that the terrain itself can quickly generate turbulence within the boundary layer. It is shown here that rugged terrain is able to generate turbulence without the assistance of a perturbation strategy; however, the levels of turbulence generated are improved when adding perturbations at the inlet. Flow over smoothed, but not flat, terrain fails to generate adequate turbulence throughout the boundary layer in all tests conducted herein. Sensitivities to the strength of the mean wind speed and boundary layer height are investigated and show that higher wind speeds produce turbulence over terrain features that slower wind speeds do not. Further, by increasing the height of the capping inversion, the effectiveness of topography alone to generate turbulence throughout the depth of the boundary is diminished. In all cases, the inclusion of a perturbation strategy improved simulation performance with respect to turbulence development.Patrick HawbeckerMatthew ChurchfieldMDPI AGarticleturbulenceterrainlarge-eddy simulationTechnologyTENEnergies, Vol 14, Iss 6858, p 6858 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	turbulence terrain large-eddy simulation Technology T
spellingShingle	turbulence terrain large-eddy simulation Technology T Patrick Hawbecker Matthew Churchfield Evaluating Terrain as a Turbulence Generation Method
description	When driving microscale large-eddy simulations with mesoscale model solutions, turbulence will take space to develop, known as <i>fetch</i>, on the microscale domain. To reduce fetch, it is common to add perturbations near the boundaries to speed up turbulence development. However, when simulating domains over complex terrain, it is possible that the terrain itself can quickly generate turbulence within the boundary layer. It is shown here that rugged terrain is able to generate turbulence without the assistance of a perturbation strategy; however, the levels of turbulence generated are improved when adding perturbations at the inlet. Flow over smoothed, but not flat, terrain fails to generate adequate turbulence throughout the boundary layer in all tests conducted herein. Sensitivities to the strength of the mean wind speed and boundary layer height are investigated and show that higher wind speeds produce turbulence over terrain features that slower wind speeds do not. Further, by increasing the height of the capping inversion, the effectiveness of topography alone to generate turbulence throughout the depth of the boundary is diminished. In all cases, the inclusion of a perturbation strategy improved simulation performance with respect to turbulence development.
format	article
author	Patrick Hawbecker Matthew Churchfield
author_facet	Patrick Hawbecker Matthew Churchfield
author_sort	Patrick Hawbecker
title	Evaluating Terrain as a Turbulence Generation Method
title_short	Evaluating Terrain as a Turbulence Generation Method
title_full	Evaluating Terrain as a Turbulence Generation Method
title_fullStr	Evaluating Terrain as a Turbulence Generation Method
title_full_unstemmed	Evaluating Terrain as a Turbulence Generation Method
title_sort	evaluating terrain as a turbulence generation method
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/792122c919e345b9bda86e038d614c0d
work_keys_str_mv	AT patrickhawbecker evaluatingterrainasaturbulencegenerationmethod AT matthewchurchfield evaluatingterrainasaturbulencegenerationmethod
_version_	1718434093104889856

Evaluating Terrain as a Turbulence Generation Method

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