Application of a BEM time stepping algorithm in understanding complex unsteady propulsion hydrodynamic phenomena

Politis, GK

dc.contributor.author	Politis, GK	en
dc.date.accessioned	2014-03-01T01:35:19Z
dc.date.available	2014-03-01T01:35:19Z
dc.date.issued	2011	en
dc.identifier.issn	0029-8018	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20994
dc.subject	Boundary element method	en
dc.subject	Incompressible non-viscous unsteady lifting flows	en
dc.subject	Unsteady propulsor hydrodynamics	en
dc.subject	Unsteady shear layer dynamics	en
dc.subject	Unsteady wake rollup	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Engineering, Ocean	en
dc.subject.classification	Oceanography	en
dc.subject.classification	Water Resources	en
dc.subject.other	Free shear layer	en
dc.subject.other	Incompressible non-viscous unsteady lifting flows	en
dc.subject.other	Infinite fluids	en
dc.subject.other	Lifting bodies	en
dc.subject.other	Numerical aspects	en
dc.subject.other	Physical characteristics	en
dc.subject.other	Propulsors	en
dc.subject.other	Quadrilateral elements	en
dc.subject.other	Shear layer	en
dc.subject.other	Simplifying assumptions	en
dc.subject.other	Time stepping algorithms	en
dc.subject.other	Unsteady wake	en
dc.subject.other	Wake model	en
dc.subject.other	Algorithms	en
dc.subject.other	Bodies of revolution	en
dc.subject.other	Boundary element method	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Hydrodynamics	en
dc.subject.other	Numerical methods	en
dc.subject.other	Problem solving	en
dc.subject.other	Propulsion	en
dc.subject.other	Vorticity	en
dc.subject.other	Wakes	en
dc.subject.other	Shear flow	en
dc.subject.other	algorithm	en
dc.subject.other	boundary element method	en
dc.subject.other	complexity	en
dc.subject.other	hydrodynamics	en
dc.subject.other	nonlinearity	en
dc.subject.other	numerical model	en
dc.subject.other	unsteady flow	en
dc.subject.other	vorticity	en
dc.subject.other	wake	en
dc.title	Application of a BEM time stepping algorithm in understanding complex unsteady propulsion hydrodynamic phenomena	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.oceaneng.2011.01.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.oceaneng.2011.01.001	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	We solve the problem of unsteady potential flow around a system of arbittarily moving rigid or flexible, lifting or non-lifting bodies, in an infinite fluid free of distributed vorticity. For the solution we use a time stepping algorithm and a potential based formulation of the corresponding free BVP. Nonlinear free shear layer dynamics are included in our modeling. This is a major innovation in treating complex unsteady propulsion problems since no simplifying assumptions (like that of a helicoidal wake) are used regarding the wake model. Bilinear quadrilateral elements are used to describe body and shear layer geometry at each time t. Three types of Kutta conditions can be alternatively applied for the determination of the shed vorticity from lifting bodies. The theoretical and numerical aspects of the method are presented followed by a number of applications, elucidating the qualitative and quantitative physical characteristics of a number of complex unsteady propulsion problems. (C) 2011 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Ocean Engineering	en
dc.identifier.doi	10.1016/j.oceaneng.2011.01.001	en
dc.identifier.isi	ISI:000288838000017	en
dc.identifier.volume	38	en
dc.identifier.issue	4	en
dc.identifier.spage	699	en
dc.identifier.epage	711	en