Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling
This paper explores realistic nonstationary atmospheric boundary layer (ABL) turbulence arising from nonstationarity at the mesoscale, particularly within offshore low-level jets with implications to offshore wind farms, using high-fidelity multiscale large-eddy simulations (LES). To this end, we an...
Published in: | Journal of Physics: Conference Series |
---|---|
Main Authors: | , , , |
Language: | unknown |
Published: |
2023
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1975002 https://www.osti.gov/biblio/1975002 https://doi.org/10.1088/1742-6596/2265/2/022064 |
id |
ftosti:oai:osti.gov:1975002 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1975002 2023-07-30T04:05:35+02:00 Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling Jayaraman, Balaji Quon, Eliot Li, Jing Chatterjee, Tanmoy 2023-06-05 application/pdf http://www.osti.gov/servlets/purl/1975002 https://www.osti.gov/biblio/1975002 https://doi.org/10.1088/1742-6596/2265/2/022064 unknown http://www.osti.gov/servlets/purl/1975002 https://www.osti.gov/biblio/1975002 https://doi.org/10.1088/1742-6596/2265/2/022064 doi:10.1088/1742-6596/2265/2/022064 17 WIND ENERGY 2023 ftosti https://doi.org/10.1088/1742-6596/2265/2/022064 2023-07-11T10:27:17Z This paper explores realistic nonstationary atmospheric boundary layer (ABL) turbulence arising from nonstationarity at the mesoscale, particularly within offshore low-level jets with implications to offshore wind farms, using high-fidelity multiscale large-eddy simulations (LES). To this end, we analyzed the single-point turbulence statistical structure of a North-Atlantic offshore LLJ event simulated using high-resolution LES (AMR-Wind). The nonstationary LLJ is simulated using a mesoscale-to-microscale coupled (MMC) simulation procedure involving data assimilation of mesoscale velocity and temperature data from the Weather Research and Forecasting (WRF) model. Unlike the assimilation of mesoscale velocity data into the LES, the direct assimilation of temperature profiles had a strong impact on turbulence stratification, thereby causing erroneous predictions of turbulence both above and within the jet layer. Various approaches to mitigate this effect have resulted in multiple (four) variants of this MMC strategy. Outcomes from this work clearly show that the turbulence within the low-level jet is a strong function of the MMC approach as the turbulence structure within the low-level jet is dependent on the flux of residual turbulence from outside the jet, which in turn depends on the temperature forcing history. Additionally, the turbulence predicted by all these different methods (as well as the observation data) show similar deviations from equilibrium as evidenced by comparisons with idealized atmospheric turbulence structure obtained using the same numerical method. In general, we observe that the predicted LLJ turbulence tends to differ from canonical ABL turbulence with comparable shear. Particularly, the combination of shear and turbulence observed in such nonstationary low-level turbulence cannot be matched using equilibrium settings and therefore, represents a critical use-case for both testing and leveraging meso–micro coupling strategies. Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Journal of Physics: Conference Series 2265 2 022064 |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
17 WIND ENERGY |
spellingShingle |
17 WIND ENERGY Jayaraman, Balaji Quon, Eliot Li, Jing Chatterjee, Tanmoy Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
topic_facet |
17 WIND ENERGY |
description |
This paper explores realistic nonstationary atmospheric boundary layer (ABL) turbulence arising from nonstationarity at the mesoscale, particularly within offshore low-level jets with implications to offshore wind farms, using high-fidelity multiscale large-eddy simulations (LES). To this end, we analyzed the single-point turbulence statistical structure of a North-Atlantic offshore LLJ event simulated using high-resolution LES (AMR-Wind). The nonstationary LLJ is simulated using a mesoscale-to-microscale coupled (MMC) simulation procedure involving data assimilation of mesoscale velocity and temperature data from the Weather Research and Forecasting (WRF) model. Unlike the assimilation of mesoscale velocity data into the LES, the direct assimilation of temperature profiles had a strong impact on turbulence stratification, thereby causing erroneous predictions of turbulence both above and within the jet layer. Various approaches to mitigate this effect have resulted in multiple (four) variants of this MMC strategy. Outcomes from this work clearly show that the turbulence within the low-level jet is a strong function of the MMC approach as the turbulence structure within the low-level jet is dependent on the flux of residual turbulence from outside the jet, which in turn depends on the temperature forcing history. Additionally, the turbulence predicted by all these different methods (as well as the observation data) show similar deviations from equilibrium as evidenced by comparisons with idealized atmospheric turbulence structure obtained using the same numerical method. In general, we observe that the predicted LLJ turbulence tends to differ from canonical ABL turbulence with comparable shear. Particularly, the combination of shear and turbulence observed in such nonstationary low-level turbulence cannot be matched using equilibrium settings and therefore, represents a critical use-case for both testing and leveraging meso–micro coupling strategies. |
author |
Jayaraman, Balaji Quon, Eliot Li, Jing Chatterjee, Tanmoy |
author_facet |
Jayaraman, Balaji Quon, Eliot Li, Jing Chatterjee, Tanmoy |
author_sort |
Jayaraman, Balaji |
title |
Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
title_short |
Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
title_full |
Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
title_fullStr |
Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
title_full_unstemmed |
Structure of Offshore Low-Level Jet Turbulence and Implications to Mesoscale-to-Microscale Coupling |
title_sort |
structure of offshore low-level jet turbulence and implications to mesoscale-to-microscale coupling |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1975002 https://www.osti.gov/biblio/1975002 https://doi.org/10.1088/1742-6596/2265/2/022064 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1975002 https://www.osti.gov/biblio/1975002 https://doi.org/10.1088/1742-6596/2265/2/022064 doi:10.1088/1742-6596/2265/2/022064 |
op_doi |
https://doi.org/10.1088/1742-6596/2265/2/022064 |
container_title |
Journal of Physics: Conference Series |
container_volume |
2265 |
container_issue |
2 |
container_start_page |
022064 |
_version_ |
1772817584905781248 |