Numerical analysis of the influence of natural convection in attics - A CFD analysis
Paper i proceeding, 2018

As the design of the building envelope has changed, the parameters that govern thermal insulation, air tightness and the complex heat transfer processes are often neglected. This aim of this research work is to numerically investigate the influence of natural convection in attics with joists and insulation. With the help of Computational Fluid Dynamics (CFD), more specifically the software ANSYS Fluent, 3D simulations are conducted for both porous layer and air cavity to estimate the magnitude of heat transfer. The same was executed for porous media with two different values of permeability. A suitable turbulence model has been applied to account for the highly sensitive buoyancy driven flow. The results are presented in form of dimensionless numbers, Nusselt number versus modified Rayleigh number. It can be concluded that the temperature difference and permeability play a vital role.

Fluid mechanics

computational fluid dynamics (CFD)

Building physics

Heat Transfer


Vijay Shankar

Luleå tekniska universitet

Andreas Bengtson

Victor Fransson

Carl-Eric Hagentoft

Chalmers, Arkitektur och samhällsbyggnadsteknik, Byggnadsteknologi

AIP Conference Proceedings

0094-243X (ISSN) 1551-7616 (eISSN)

Vol. 1978 470010
978-073541690-1 (ISBN)

International Conference of Numerical Analysis and Applied Mathematics, ICNAAM 2017
Thessaloniki, Greece,



Strömningsmekanik och akustik




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