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Pseudo-transient computational fluid dynamics analysis of an underbonnet compartment during thermal soak

Franchetta, M.; Suen, K.O.; Bancroft, T.G.; (2007) Pseudo-transient computational fluid dynamics analysis of an underbonnet compartment during thermal soak. Proceedings of the Institution of Mechanical Engineers. Part D. Journal of Automobile Engineering , 221 (10) pp. 1209-1220. 10.1243/09544070JAUTO555. Green open access

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Abstract

Underbonnet simulations are proving to be crucially important within a vehicle development programme, reducing test work and time-to-market. While computational fluid dynamics (CFD) simulations of steady forced flows have been demonstrated to be reliable, studies of transient convective flows in engine compartments are not yet carried out owing to high computing demands and lack of validated work. The present work assesses the practical feasibility of applying the CFD tool at the initial stage of a vehicle development programme for investigating the thermally driven flow in an engine bay under thermal soak. A computation procedure that enables pseudo time-marching CFD simulations to be performed with significantly reduced central processing unit (CPU) time usage is proposed. The methodology was initially tested on simple geometries and then implemented for investigating a simplified half-scale underbonnet compartment. The numerical results are compared with experimental data taken with thermocouples and with particle image velocimetry (PIV). The novel computation methodology is successful in efficiently providing detailed and time-accurate time-dependent thermal and flow predictions. Its application will extend the use of the CFD tool for transient investigations, enabling improvements to the component packaging of engine bays and the refinement of thermal management strategies with reduced need for in-territory testing.

Type: Article
Title: Pseudo-transient computational fluid dynamics analysis of an underbonnet compartment during thermal soak
Open access status: An open access version is available from UCL Discovery
DOI: 10.1243/09544070JAUTO555
Publisher version: http://dx.doi.org/10.1243/09544070JAUTO555
Language: English
Additional information: Published by Professional Engineering Publishing (Institution of Mechanical Engineers)
Keywords: CFD, transient, underbonnet, natural convection, thermal management, PIV
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery-pp.ucl.ac.uk/id/eprint/11730
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