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Validating CFD predictions of flow over an escarpment using ground-based and airborne measurement devices

El Bahlouli, A.; Leukauf, D.; Platis, A.; Berge, K. Z.; Bange, J.; Knaus, H.

Micrometeorological observations from a tower, an eddy-covariance (EC) station and an unmanned aircraft system (UAS) at the WINSENT test-site are used to validate a computational fluid dynamics (CFD) model, driven by a mesoscale model. The observation site is characterised by a forested escarpment in a complex terrain. A two-day measurement campaign with a flow almost perpendicular to the escarpment is analysed. The first day is dominated by high wind speeds, while, on the second one, calm wind conditions are present. Despite some minor differences, the flow structure, analysed in terms of horizontal wind speeds, wind direction and inclination angles shows similarities for both days. A real-time strategy is used for the CFD validation with the UAS measurement, where the model follows spatially and temporally the aircraft. This strategy has proved to be successful. Stability indices such as the potential temperature and the bulk Richardson number are calculated to diagnose atmospheric boundary layer (ABL) characteristics up to the highest flight level. The calculated bulk Richardson values indicate a dynamically unstable region behind the escarpment and near the ground for both days. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000125464
Veröffentlicht am 29.11.2020
DOI: 10.3390/en13184688
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000125464
HGF-Programm 12.02.04 (POF III, LK 01) Urban-Rural Interactions
Erschienen in Energies
Verlag MDPI
Band 13
Heft 18
Seiten Art. Nr.: 4688
Vorab online veröffentlicht am 09.09.2020
Schlagwörter complex terrain, mesoscale-microscale coupling, unmanned aircraft systems (UAS), tower measurements
Nachgewiesen in Scopus
Web of Science
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