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DTSTAMP:20230831T095746Z
LOCATION:Davos
DTSTART;TZID=Europe/Stockholm:20230627T100600
DTEND;TZID=Europe/Stockholm:20230627T100700
UID:submissions.pasc-conference.org_PASC23_sess110_pos127@linklings.com
SUMMARY:P35 - Investigating the Mechanism of a Local Windstorm in the Swis
 s Alps Using Large-Eddy Simulations
DESCRIPTION:Poster\n\nNicolai Krieger (ETH Zurich), Christian Kühnlein (EC
 MWF), and Michael Sprenger and Heini Wernli (ETH Zurich)\n\nThe Laseyer wi
 ndstorm is a local and strong wind phenomenon in the narrow Schwende valle
 y in northeastern Switzerland. The phenomenon has raised the interest of m
 eteorologists as it has - in the past - led to derailments of the local tr
 ain. It is characterised by easterly to southeasterly winds during strong 
 northwesterly ambient wind conditions, thus the wind in the valley reverse
 s compared to the flow further aloft. We use a newly developed large-eddy 
 simulation (LES) configuration of the FVM atmospheric model based on Pytho
 n and GT4Py to gain a better understanding of the Laseyer windstorm. The L
 ES are performed in the very steep and highly complex terrain using ideali
 sed initial and boundary conditions. With this numerical tool we can study
  the sensitivity to ambient flow parameters in a controlled environment. A
 s a result, we are able to shed light on the mechanism of the Laseyer by r
 evealing the flow structure and variability in the narrow Schwende valley.
  A set of idealised LES with carefully selected ambient flow parameters al
 lows us to identify the wind direction and wind speed conditions needed fo
 r the occurrence of the Laseyer and its response to changing ambient flow 
 conditions.\n\nSession Chair: Jibonananda Sanyal (National Renewable Energ
 y Laboratory)
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