Title
Numerical simulation and ventilation efficiency of bicycle helmets
Author
Faculty/Department
Faculty of Design Sciences
Publication type
article
Publication
Subject
Engineering sciences. Technology
Source (journal)
CMES : computer modeling in engineering & sciences
Volume/pages
31(2008) :2 , p. 61-70
ISSN
1526-1492
ISI
000259627800001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This paper demonstrates the use of the concept of the local mean age of air (LMAA) to quantify ventilation effectiveness under bicycle rider's safety helmets. The specific objective is to study the effect of helmet openings on the resulting ventilation effectiveness. To quantify ventilation effectiveness using the concept of LMAA, dynamic tracer gas data are necessary. The data were generated using a Computational Fluid Dynamics (CFD) model. Two bicycle helmet designs were used and compared with respect to ventilation performance. The result showed that the helmet with more openings had better performance especially at the back of the head. The methodology has practical importance in order to integrate riders comfort criteria in the design of new helmets.
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