Articles | Volume 14, issue 6
Geosci. Model Dev., 14, 3185–3214, 2021
https://doi.org/10.5194/gmd-14-3185-2021

Special issue: The PALM model system 6.0 for atmospheric and oceanic boundary-layer...

Geosci. Model Dev., 14, 3185–3214, 2021
https://doi.org/10.5194/gmd-14-3185-2021

Development and technical paper 03 Jun 2021

Development and technical paper | 03 Jun 2021

A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0

Antti Hellsten et al.

Data sets

A Nested Multi-Scale System Implemented in the Large-Eddy Simulation Model PALM model system 6.0 [Draft] Antti Hellsten, Klaus Ketelsen, Matthias Sühring, Mikko Auvinen, Björn Maronga, Christoph Knigge, Fotios Barmpas, Georgios Tsegas, Nicolas Moussiopoulos, and Siegfried Raasch https://doi.org/10.25835/0090593

Model code and software

A Nested Multi-Scale System Implemented in the Large-Eddy Simulation Model PALM model system 6.0 [Draft] Antti Hellsten, Klaus Ketelsen, Matthias Sühring, Mikko Auvinen, Björn Maronga, Christoph Knigge, Fotios Barmpas, Georgios Tsegas, Nicolas Moussiopoulos, and Siegfried Raasch https://doi.org/10.25835/0090593

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Short summary
Large-eddy simulation (LES) of the urban atmospheric boundary layer involves a large separation of turbulent scales, leading to prohibitive computational costs. An online LES–LES nesting scheme is implemented into the PALM model system 6.0 to overcome this problem. Test results show that the accuracy within the high-resolution nest domains approach the non-nested high-resolution reference results. The nesting can reduce the CPU by time up to 80 % compared to the fine-resolution reference runs.