气候变化领域集成服务门户(CCPortal): New consideration of lateral boundary treatment for meso- and micro-scale nested PBL simulations over complex terrain

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DOI	10.1016/j.atmosres.2021.105507
	New consideration of lateral boundary treatment for meso- and micro-scale nested PBL simulations over complex terrain
	Zhao Z.; Xiao Y.; Li C.; Wang J.; Hu G.
发表日期	2021
ISSN	0169-8095
卷号	254
英文摘要	A detailed planetary boundary layer (PBL) flow over complex terrain can be simulated by nesting mesoscale numerical weather prediction (NWP) models and microscale computational fluid dynamics (CFD). When fully prescribed lateral boundaries are encountered, the over-specified treatment of CFD or limited-area models may result in ill-posedness and numerical instabilities. Such behaviors are due to inconsistent governing equations, turbulent viscosity models, and underlying surfaces between meso- and micro-scale formulations. In this study, by applying the relaxation treatment in marginal zones of CFD, its wind components are forced toward the externally specified NWP values. The relaxation schemes, deduced from simple advective transport equations, are optimized using genetic algorithms. Their numerical abilities in absorbing wave reflections on shallow-water systems are more efficient than the published approach. Then, key questions concerning the selection of relaxation strength, turbulence model constants, and prognostic variables specified on NWP–CFD nested boundaries are systemically investigated in the neutrally stratified Askervein Hill case. The relaxation scheme from simpler systems also performs effectively in CFD and decreases the adaption distance of wind velocities near over-specified outlet boundaries. A full set approach to obtain well-posed PBL solutions from the microscale domains sustained with inflow boundaries from NWP is proposed and validated. © 2021 Elsevier B.V.
英文关键词	Complex terrain; Genetic algorithms; Limited-area models; NWP-CFD; PBL parameterization
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236831
作者单位	School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, China; Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Zhao Z.,Xiao Y.,Li C.,et al. New consideration of lateral boundary treatment for meso- and micro-scale nested PBL simulations over complex terrain[J],2021,254.
APA	Zhao Z.,Xiao Y.,Li C.,Wang J.,&Hu G..(2021).New consideration of lateral boundary treatment for meso- and micro-scale nested PBL simulations over complex terrain.Atmospheric Research,254.
MLA	Zhao Z.,et al."New consideration of lateral boundary treatment for meso- and micro-scale nested PBL simulations over complex terrain".Atmospheric Research 254(2021).