Challenges of constructing and selecting the “perfect” boundary conditions for the large-eddy simulation model PALM

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985807%3A_____%2F24%3A00585439" target="_blank" >RIV/67985807:_____/24:00585439 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/24:10490526

Result on the web

<a href="https://doi.org/10.5194/gmd-17-2901-2024" target="_blank" >https://doi.org/10.5194/gmd-17-2901-2024</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/gmd-17-2901-2024" target="_blank" >10.5194/gmd-17-2901-2024</a>

Result language

angličtina

Original language name

Challenges of constructing and selecting the “perfect” boundary conditions for the large-eddy simulation model PALM

Original language description

We present the process of and difficulties in acquiring the proper boundary conditions (BCs) for the state-of-the-art large-eddy simulation (LES)-based PALM model system. We use the mesoscale Weather Research and Forecasting (WRF) model as a source of inputs for the PALM preprocessor and investigate the influence of the mesoscale model on the performance of the PALM model. A total of 16 different WRF configurations were used as a proxy for a multi-model ensemble. We developed a technique for selecting suitable sets of BCs, performed PALM model simulations driven by these BCs, and investigated the consequences of selecting a sub-optimal WRF configuration. The procedure was tested for four episodes in different seasons of the year 2019, during which WRF and PALM outputs were evaluated against the atmospheric radiosounding observations. We show that the PALM model outputs are heavily dependent on the imposed BCs and have different responses at different times of the day and in different seasons. We demonstrate that the main driver of errors is the mesoscale model and that the PALM model is capable of attenuating but not fully correcting them. The PALM model attenuates the impact of errors in BCs in wind speed, while for the air temperature, PALM shows variable behavior with respect to driving conditions. This study stresses the importance of high-quality driving BCs and the complexity of the process of their construction and selection.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

<a href="/en/project/TO01000219" target="_blank" >TO01000219: Turbulent-resolving urban modeling of air quality and thermal comfort</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geoscientific Model Development

ISSN

1991-959X

e-ISSN

1991-9603

Volume of the periodical

17

Issue of the periodical within the volume

7

Country of publishing house

DE - GERMANY

Number of pages

27

Pages from-to

2901-2927

UT code for WoS article

001202919400001

EID of the result in the Scopus database

2-s2.0-85190765550