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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/gmd-2020-172
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2020-172
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 29 Jul 2020

Submitted as: model evaluation paper | 29 Jul 2020

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This preprint is currently under review for the journal GMD.

Validation of the Dynamic Core of the PALM Model System 6.0 in Urban Environments: LES andWind-tunnel Experiments

Tobias Gronemeier1, Kerstin Surm2, Frank Harms2, Bernd Leitl2, Björn Maronga1,3, and Siegfried Raasch1 Tobias Gronemeier et al.
  • 1Leibniz University Hannover, Institute of Meteorology and Climatology, Hannover, Germany
  • 2Universität Hamburg, Meteorological Institute, Hamburg, Germany
  • 3University of Bergen, Geophysical Institute, Bergen, Norway

Abstract. We present the capability of PALM 6.0, the latest version of the PALM model system, to simulate neutrally stratified urban boundary layers. The studied situation includes a real-case building setup of the HafenCity area in Hamburg, Germany. Simulation results are validated against wind-tunnel measurements of the same building layout utilizing PALM's virtual measurement module. The comparison reveals an overall very high agreement between simulation results and wind-tunnel measurements not only for mean wind speed and direction but also for turbulence statistics. However, differences between measurements and simulation arise within close vicinity of surfaces where the resolution prevents good representation of the inertial sub-range of turbulence. In the end, we give guidance how these differences can be reduced using already implemented features of PALM.

Tobias Gronemeier et al.

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Status: open (extended)
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Tobias Gronemeier et al.

Data sets

Validation of the Dynamic Core of the PALM Model System 6.0 in Urban Environments: Simulation Input Data and Measurement Data T. Gronemeier, K. Surm, F. Harms, B. Leitl, B. Maronga, and S. Raasch https://doi.org/10.25835/0015082

Model code and software

PALM 6.0 r3921 T. Gronemeier et al. https://doi.org/10.25835/0046914

Tobias Gronemeier et al.

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Latest update: 28 Oct 2020
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Short summary
We present the capability of PALM 6.0, the latest version of the PALM model system, to simulate urban boundary layers. The studied situation includes a real-case building setup of the HafenCity area in Hamburg, Germany. Simulation results are validated against wind-tunnel measurements utilizing PALM's virtual measurement module. The comparison reveals an overall very high agreement between simulation results and wind-tunnel measurements including wind speed direction and turbulence statistics.
We present the capability of PALM 6.0, the latest version of the PALM model system, to simulate...
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