NATURAL-CONVECTION FLOW IN A SQUARE CAVITY REVISITED - LAMINAR AND TURBULENT MODELS WITH WALL FUNCTIONS

BARAKOS, G; MITSOULIS, E; ASSIMACOPOULOS, D

dc.contributor.author	BARAKOS, G	en
dc.contributor.author	MITSOULIS, E	en
dc.contributor.author	ASSIMACOPOULOS, D	en
dc.date.accessioned	2014-03-01T01:09:59Z
dc.date.available	2014-03-01T01:09:59Z
dc.date.issued	1994	en
dc.identifier.issn	0271-2091	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11280
dc.subject	KAPPA-EPSILON-MODEL	en
dc.subject	TURBULENCE MODELING	en
dc.subject	NATURAL CONVECTION	en
dc.subject	HEAT TRANSFER	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	HEATED VERTICAL PLATE	en
dc.subject.other	BOUNDARY-LAYER	en
dc.subject.other	PREDICTION	en
dc.subject.other	ENCLOSURES	en
dc.title	NATURAL-CONVECTION FLOW IN A SQUARE CAVITY REVISITED - LAMINAR AND TURBULENT MODELS WITH WALL FUNCTIONS	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/fld.1650180705	en
heal.identifier.secondary	http://dx.doi.org/10.1002/fld.1650180705	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	Numerical simulations have been undertaken for the benchmark problem of natural convection flow in a square cavity. The control volume method is used to solve the conservation equations for laminar and turbulent flows for a series of Rayleigh numbers (Ra) reaching values up to 10(10). The k-epsilon model has been used for turbulence modelling with and without logarithmic wall functions. Uniform and non-uniform (stretched) grids have been employed with increasing density to guarantee accurate solutions, especially near the walls for high Ra-values. ADI and SIP solvers are implemented to accelerate convergence. Excellent agreement is obtained with previous numerical solutions, while some discrepancies with others for high Ra-values may be due to a possibly different implementation of the wall functions. Comparisons with experimental data for heat transfer (Nusselt number) clearly demonstrates the limitations of the standard k-epsilon model with logarithmic wall functions, which gives significant overpredictions.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS	en
dc.identifier.doi	10.1002/fld.1650180705	en
dc.identifier.isi	ISI:A1994NJ91600004	en
dc.identifier.volume	18	en
dc.identifier.issue	7	en
dc.identifier.spage	695	en
dc.identifier.epage	719	en