A novel flow-oriented discretization scheme for reducing false diffusion in three-dimensional (3D) flows: An application in the indoor environment

Karadimou, DP; Markatos, NC

dc.contributor.author	Karadimou, DP	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T11:46:38Z
dc.date.available	2014-03-01T11:46:38Z
dc.date.issued	2012	en
dc.identifier.issn	13522310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/37987
dc.subject	Air-particles flow	en
dc.subject	Computational fluid dynamics	en
dc.subject	Euler-Euler method	en
dc.subject	Indoor environment	en
dc.subject	Numerical scheme	en
dc.title	A novel flow-oriented discretization scheme for reducing false diffusion in three-dimensional (3D) flows: An application in the indoor environment	en
heal.type	other	en
heal.identifier.primary	10.1016/j.atmosenv.2012.07.033	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.atmosenv.2012.07.033	en
heal.publicationDate	2012	en
heal.abstract	Numerical approximation of the convection terms in the conservation equations is mainly responsible for false diffusion errors. One way to overcome this problem is to use an upwind approximation which essentially follows the streamlines. This approach was originally derived by Raithby (1976a). Patel et al. (1988) derived a different formulation trying to eliminate the shortcomings of the original scheme. The latter approach was formally called CUPID.11Corner Upwinding. (Corner Upwinding) and it was then simplified for 2D flows by SUCCA.22Skew Upwind Corner Convection Algorithm. (Skew Upwind Corner Convection Algorithm). The method outlined in this paper retains the features of CUPID and SUCCA schemes and extents the formulation of the convection terms in a finite volume approach appropriate for 3D flows, including the momentum equations. The new discretization scheme formally called SUPER.33Skew Upwind and Corner Algorithm. (Skew Upwind and Corn. er Algorithm) is validated by modelling the indoor two-phase flow of air and particles in the three dimensional geometry of a scale-model room. Furthermore, the performance of the new scheme is compared with the conventional upwind scheme in the case of inclined inflow (θ = 45°). The numerical results indicate that the new scheme has the potential for minimizing false diffusion in three dimensional flows. © 2012 Elsevier Ltd.	en
heal.journalName	Atmospheric Environment	en
dc.identifier.doi	10.1016/j.atmosenv.2012.07.033	en
dc.identifier.volume	61	en
dc.identifier.spage	327	en
dc.identifier.epage	339	en