气候变化领域集成服务门户(CCPortal): Development of a Data Assimilation Method Using Vibration Equation for Large-Eddy Simulations of Turbulent Boundary Layer Flows

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DOI	10.1029/2019MS001872
	Development of a Data Assimilation Method Using Vibration Equation for Large-Eddy Simulations of Turbulent Boundary Layer Flows
	Nakayama H.; Takemi T.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	In order to improve the simulation accuracy, it is effective to use a data assimilation technique which is capable of reproducing more realistic simulated states by incorporating observational data into simulation models. One of the simplest ones among data assimilation techniques is a Newtonian relaxation-type nudging method which has been widely used in mesoscale meteorological models. In this study, we proposed a data assimilation method using a vibration equation which can incorporate turbulence winds toward target mean winds while maintaining small-scale turbulent fluctuations as a different approach from the conventional nudging method. First, we conducted test simulations in which nudging is applied in a basic turbulent boundary layer (TBL) flow toward a target one. It is shown that the basic TBL flow can be reasonably nudged toward the target one while maintaining the turbulent fluctuations well when prescribing the natural frequency in the vibration equation smaller than the spectral peak frequency in the TBL flow. Then, we applied the proposed nudging method by incorporating data obtained from meteorological observations located in the actual city of Kyoto. The mean wind velocity profiles were reasonably nudged toward the target observed profile and the turbulence statistics were also favorably maintained. It is concluded that the data assimilation method using the vibration equation successfully nudges toward the target mean winds while maintaining small-scale turbulent fluctuations well. © 2020. The Authors.
英文关键词	data assimilation method using vibration equation; large-eddy simulation; turbulent boundary layer flows
语种	英语
scopus关键词	Boundary layer flow; Boundary layers; Gravitational effects; Large eddy simulation; Turbulence; Wind; Data assimilation methods; Data assimilation techniques; Mesoscale meteorological model; Meteorological observation; Spectral peak frequency; Turbulence statistics; Turbulent boundary layer flow; Turbulent boundary layers; Atmospheric thermodynamics; boundary layer; data assimilation; large eddy simulation; meteorology; turbulent boundary layer; turbulent flow; wind velocity; Honshu; Japan; Kinki; Kyoto [Kinki]
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156661
作者单位	Japan Atomic Energy Agency, Ibaraki, Japan; Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
推荐引用方式 GB/T 7714	Nakayama H.,Takemi T.. Development of a Data Assimilation Method Using Vibration Equation for Large-Eddy Simulations of Turbulent Boundary Layer Flows[J],2020,12(8).
APA	Nakayama H.,&Takemi T..(2020).Development of a Data Assimilation Method Using Vibration Equation for Large-Eddy Simulations of Turbulent Boundary Layer Flows.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Nakayama H.,et al."Development of a Data Assimilation Method Using Vibration Equation for Large-Eddy Simulations of Turbulent Boundary Layer Flows".Journal of Advances in Modeling Earth Systems 12.8(2020).