A characteristic based method for the calculation of three-dimensional incompressible, turbulent and steady flows in hydraulic turbomachines and installations

Govatsos, PA; Papantonis, DE

dc.contributor.author	Govatsos, PA	en
dc.contributor.author	Papantonis, DE	en
dc.date.accessioned	2014-03-01T01:15:24Z
dc.date.available	2014-03-01T01:15:24Z
dc.date.issued	2000	en
dc.identifier.issn	0271-2091	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13477
dc.subject	artificial compressibility	en
dc.subject	hydraulic turbomachines	en
dc.subject	incompressible flows	en
dc.subject	Navier-Stokes equations	en
dc.subject	Riemann solver	en
dc.subject	SHF water pump	en
dc.subject.classification	Computer Science, Interdisciplinary Applications	en
dc.subject.classification	Mathematics, Interdisciplinary Applications	en
dc.subject.classification	Mechanics	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	MODEL	en
dc.title	A characteristic based method for the calculation of three-dimensional incompressible, turbulent and steady flows in hydraulic turbomachines and installations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1097-0363(20000915)34:1<1::AID-FLD46>3.0.CO;2-W	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1097-0363(20000915)34:1<1::AID-FLD46>3.0.CO;2-W	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The present algorithm is developed to calculate three-dimensional incompressible, turbulent and steady flows in hydraulic turbomachines and installations. The code is based on a characteristic based method for the solution of the incompressible Navier-Stokes equations, coupling the continuity and momentum equations after the introduction of the artificial compressibility formulation. The primitive variables, pressure and velocity components are defined as functions of their Values on the characteristics. The primitive variables on the characteristics are calculated by an upwind differencing scheme based on the sign of the local eigenvalue of the Jacobian matrix of the convective fluxes. The upwind scheme uses interpolation formulas of third-order accuracy. The standard k-epsilon model is applied for the description of turbulence effects. The time discretization is obtained by the explicit Runge-Kutta method. For faster convergences to the steady state solution, a local time stepping and a mesh-sequencing scheme are used. Validation of the algorithm is performed on many two- and three-dimensional laminar and turbulent flow cases, while in the present work, the three-dimensional flow (laminar and turbulent) through a square duct with a 90 degrees bend is presented. Finally, the code is applied for the prediction of the relative flow through the impeller of the Societe Hydrotechnique de France (SHF) water pump. The numerical results are compared with the corresponding experimental measurements. Copyright (C) 2000 John Wiley & Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS	en
dc.identifier.doi	10.1002/1097-0363(20000915)34:1<1::AID-FLD46>3.0.CO;2-W	en
dc.identifier.isi	ISI:000089132300001	en
dc.identifier.volume	34	en
dc.identifier.issue	1	en
dc.identifier.spage	1	en
dc.identifier.epage	30	en