3-D numerical modeling of supercritical flow in gradual expansions

Stamou, AI; Chapsas, DG; Christodoulou, GC

dc.contributor.author	Stamou, AI	en
dc.contributor.author	Chapsas, DG	en
dc.contributor.author	Christodoulou, GC	en
dc.date.accessioned	2014-03-01T01:27:38Z
dc.date.available	2014-03-01T01:27:38Z
dc.date.issued	2008	en
dc.identifier.issn	0022-1686	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18515
dc.subject	Computational Fluid Dynamics (CFD)	en
dc.subject	Expansion flow	en
dc.subject	Mathematical model	en
dc.subject	Modified Rouse curve	en
dc.subject	Supercritical flow	en
dc.subject	Volume of Fluid (VOF) method	en
dc.subject.classification	Engineering, Civil	en
dc.subject.classification	Water Resources	en
dc.subject.other	Engineering research	en
dc.subject.other	Expansion	en
dc.subject.other	Flow of water	en
dc.subject.other	Fluid mechanics	en
dc.subject.other	Free volume	en
dc.subject.other	Hydraulics	en
dc.subject.other	Shore protection	en
dc.subject.other	Applied (CO)	en
dc.subject.other	CFD modeling	en
dc.subject.other	Experimental data	en
dc.subject.other	Experimental results	en
dc.subject.other	Flow conditioning	en
dc.subject.other	Free surfaces	en
dc.subject.other	Hydraulic engineering	en
dc.subject.other	Inner walls	en
dc.subject.other	International association	en
dc.subject.other	Numerical modelling	en
dc.subject.other	Open channels	en
dc.subject.other	Shock fronts	en
dc.subject.other	Super-critical	en
dc.subject.other	Supercritical flows	en
dc.subject.other	Surface profiling	en
dc.subject.other	Volume of fluid (VOF) methods	en
dc.subject.other	Three dimensional	en
dc.subject.other	computational fluid dynamics	en
dc.subject.other	experimental study	en
dc.subject.other	flow structure	en
dc.subject.other	flow velocity	en
dc.subject.other	Froude number	en
dc.subject.other	numerical model	en
dc.subject.other	open channel flow	en
dc.subject.other	optimization	en
dc.subject.other	supercritical flow	en
dc.subject.other	three-dimensional modeling	en
dc.title	3-D numerical modeling of supercritical flow in gradual expansions	en
heal.type	journalArticle	en
heal.identifier.primary	10.3826/jhr.2008.3162	en
heal.identifier.secondary	http://dx.doi.org/10.3826/jhr.2008.3162	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	A 3-D CFD model based on the Volume of Fluid method to calculate the free surface was used to study supercritical flow in gradual open channel expansions. The model was first applied to a modified Rouse expansion, for which extensive experimental data are available. A detailed comparison between the numerical and the experimental results concerning surface profiles, velocities, free surface uniformity, and shock front location showed satisfactory agreement, especially for lower supercritical Froude numbers. The model was subsequently applied to optimize and finalize the design of a compound expansion structure with variable bottom elevation, piers, and inner walls. CFD calculation showed that flow conditions in this structure are satisfactory, provided that bottom ramps are used to ensure a uniform variation of the bottom elevation. © 2008 International Association of Hydraulic Engineering and Research.	en
heal.publisher	INT ASSOC HYDRAULIC RESEARCH	en
heal.journalName	Journal of Hydraulic Research	en
dc.identifier.doi	10.3826/jhr.2008.3162	en
dc.identifier.isi	ISI:000257172400012	en
dc.identifier.volume	46	en
dc.identifier.issue	3	en
dc.identifier.spage	402	en
dc.identifier.epage	409	en