Stable stratification effects on the flow past surface obstructions: A numerical study

Trifonopoulos, DA; Bergeles, GC

dc.contributor.author	Trifonopoulos, DA	en
dc.contributor.author	Bergeles, GC	en
dc.date.accessioned	2014-03-01T01:09:04Z
dc.date.available	2014-03-01T01:09:04Z
dc.date.issued	1992	en
dc.identifier.issn	0142-727X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10817
dc.subject	Boussinesq approximation	en
dc.subject	finite differences	en
dc.subject	flow over three-dimensional hill	en
dc.subject	stable stratification	en
dc.subject	turbulence modeling	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Approximation Theory	en
dc.subject.other	Boundary Layer Flow	en
dc.subject.other	Finite Difference Method	en
dc.subject.other	Mathematical Models	en
dc.subject.other	Boussinesq Approximation	en
dc.subject.other	Flow Over Three Dimensional Hill	en
dc.subject.other	Stable Stratification	en
dc.subject.other	Surface Obstructions	en
dc.subject.other	Turbulent Flow	en
dc.title	Stable stratification effects on the flow past surface obstructions: A numerical study	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0142-727X(92)90022-2	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0142-727X(92)90022-2	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	Numerical predictions of the stably stratified flow fields past surface-mounted obstructions are presented. The time-averaged Reynolds equations, coupled with the continuity and temperature/concentration equation for the incompressible fluid, have been solved in the transformed space, using finite differences, adopting the Boussinesq approximation to account for density variations. Buoyancy effects on turbulence have been considered in the two-equation k-ε model, which has been used as a turbulence closure. The turbulent flow fields over a two-dimensional fence and around a three-dimensional hill were simulated for neutral and various stable conditions. The decrease of the cavity wake length behind the two-dimensional fence, due to the temperature gradient, was clearly depicted by the computations. The stability effect on the mean flow past the three-dimensional axisymmetric hill, for various Froude numbers, were reproduced satisfactorily, although some underestimation of the bouyancy influences in some cases was observed. The boundary layer lee side separation was suppressed with increasing stability, and the beginning of a hydraulic jump was predicted for Froude numbers smaller than unit. The comparison between the computations and the available measurements established the reliability of the presented method. © 1992.	en
heal.publisher	BUTTERWORTH-HEINEMANN	en
heal.journalName	International Journal of Heat and Fluid Flow	en
dc.identifier.doi	10.1016/0142-727X(92)90022-2	en
dc.identifier.isi	ISI:A1992HZ82100006	en
dc.identifier.volume	13	en
dc.identifier.issue	2	en
dc.identifier.spage	151	en
dc.identifier.epage	159	en