WIT Press


The Use Of Pressure Loss As Boundary Condition Of Internal Flows Promoted By Thermal Buoyancy

Price

Free (open access)

Paper DOI

10.2495/HT940411

Volume

5

Pages

8

Published

1994

Size

681 kb

Author(s)

J.F.A. Dias Delgado

Abstract

The use of pressure loss as boundary condition of internal flows promoted by thermal buoyancy J.F.A. Dias Delgado Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2825 Monte de Caparica, Portugal ABSTRACT Velocity can not be used as boundary condition to calculate internal flows promoted by thermal buoyancy connected to the outside environment through ventilation openings. Pressure loss characteristics of the ventilation openings can be used as a mean to calculate velocities at the openings. The way how this boundary condition is introduced in a finite volume approach for both staggered and a nonstaggered grid formulations is presented and analyzed. INTRODUCTION Internal flows promoted by thermal buoyancy, such as natural ventilation and fire inside room buildings, are almost the cases fully turbulent and three dimensional. To simulate the turbulent flow a k-e two-equation turbulence model is used in the present work. In many cases these interna

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