Zonal structure of unbounded external-flow and aerodynamics

doi:10.1088/1873-7005/aa79d0

CORC > 北京大学 > 工学院

	Zonal structure of unbounded external-flow and aerodynamics
	Liu, L. Q. ; Kang, L. L. ; Wu, J. Z.
刊名	FLUID DYNAMICS RESEARCH
	2017
关键词	external flow far-field velocity zonal structure aerodynamics EQUATION-OF-MOTION COMPRESSIBLE FLOW FORCE FLUID CYLINDER SPHERE
DOI	10.1088/1873-7005/aa79d0
英文摘要	This paper starts from the far-field behaviors of velocity field in externally unbounded flow. We find that the well-known algebraic decay of disturbance velocity as derived kinematically is too conservative. Once the kinetics are taken into account by working on the fundamental solutions of far-field linearized Navier-Stokes equations, it is proven that the furthest far-field zone adjacent to the uniform fluid at infinity must be unsteady, viscous and compressible, where all disturbances degenerate to sound waves that decay exponentially. But this optimal rate does not exist in some commonly used simplified flow models, such as steady flow, incompressible flow and inviscid flow, because they actually work in true subspaces of the unbounded free space, which are surrounded by further far fields of different nature. This finding naturally leads to a zonal structure of externally unbounded flow field. The significance of the zonal structure is demonstrated by its close relevance to existing theories of aerodynamic force and moment in external flows, including the removal of the difficulties or paradoxes inherent in the simplified models.; NSFC of China [10921202, 11472016]; Boya Postdoctoral Fellowship; SCI(E); ARTICLE; 4; 49
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471913]
专题	工学院
推荐引用方式 GB/T 7714	Liu, L. Q.,Kang, L. L.,Wu, J. Z.. Zonal structure of unbounded external-flow and aerodynamics[J]. FLUID DYNAMICS RESEARCH,2017.
APA	Liu, L. Q.,Kang, L. L.,&Wu, J. Z..(2017).Zonal structure of unbounded external-flow and aerodynamics.FLUID DYNAMICS RESEARCH.
MLA	Liu, L. Q.,et al."Zonal structure of unbounded external-flow and aerodynamics".FLUID DYNAMICS RESEARCH (2017).