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

0585439 - ÚI 2025 RIV DE eng J - Journal Article
Radović, J. - Belda, M. - Resler, Jaroslav - Eben, Kryštof - Bureš, Martin - Geletič, Jan - Krč, Pavel - Řezníček, Hynek - Fuka, V.
Challenges of constructing and selecting the “perfect” boundary conditions for the large-eddy simulation model PALM.
Geoscientific Model Development. Roč. 17, č. 7 (2024), s. 2901-2927. ISSN 1991-959X. E-ISSN 1991-9603
R&D Projects: GA TA ČR(CZ) TO01000219
Institutional support: RVO:67985807
Keywords : large-eddy simulation * urban climate * boundary conditions * sensitivity * coupling
OECD category: Meteorology and atmospheric sciences
Impact factor: 5.1, year: 2022
Method of publishing: Open access
https://doi.org/10.5194/gmd-17-2901-2024

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.
Permanent Link: https://hdl.handle.net/11104/0353148


Research data: GMD - Supplement