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

Hellsten, Antti; Ketelsen, Klaus; Sühring, Matthias; Auvinen, Mikko; Maronga, Björn; Knigge, Christoph; Barmpas, Fotios; Tsegas, Georgios; Moussiopoulos, Nicolas; Raasch, Siegfried

doi:https://doi.org/10.5194/gmd-14-3185-2021

Articles | Volume 14, issue 6

https://doi.org/10.5194/gmd-14-3185-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

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

https://doi.org/10.5194/gmd-14-3185-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 14, issue 6

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, Klaus Ketelsen, Matthias Sühring, Mikko Auvinen, Björn Maronga, Christoph Knigge, Fotios Barmpas, Georgios Tsegas, Nicolas Moussiopoulos, and Siegfried Raasch

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Final revised paper (published on 03 Jun 2021)
Preprint (discussion started on 07 Sep 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

SC1: 'Interpolation scheme section 3.4', Sebastian Giersch, 14 Sep 2020
RC1: 'review comments', Anonymous Referee #1, 13 Oct 2020
RC2: 'Review of gmd-2020-222', Anonymous Referee #2, 09 Nov 2020
AC1: 'Comment on gmd-2020-222', Antti Hellsten, 29 Jan 2021

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Antti Hellsten on behalf of the Authors (29 Jan 2021) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (09 Feb 2021) by Paul Ullrich

RR by Anonymous Referee #1 (10 Feb 2021)

ED: Publish subject to minor revisions (review by editor) (29 Mar 2021) by Paul Ullrich

AR by Antti Hellsten on behalf of the Authors (08 Apr 2021) Author's tracked changes

ED: Publish as is (22 Apr 2021) by Paul Ullrich

AR by Antti Hellsten on behalf of the Authors (30 Apr 2021) Manuscript

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.