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Improving Aerodynamic Performance of a Truck: a Numerical Based Analysis
KTH, School of Engineering Sciences (SCI), Mechanics.
2015 (English)Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

With a change in EU-legislation regarding the dimensions

of heavy trucks [1] coming up, specifically allowing aerodynamic

devices fitted to the back of trailers, the transportation

industry is set to largely decrease its environmental

impact in the near future. These aerodynamic devices have

been researched for quite some time [2] but have not yet

gained widespread market acceptance, partly because of

the transportation industry’s complex owner structures and

partly because of size regulations of the past. Though with

this new legislation and other expected new EU-legislation

on CO2 emissions, development of these aerodynamic devices

looks set to become a field of intense study.

The study explores different options regarding the influence

of changing the rear shape of a generalized ground

transportation system (GTS), a simplified model of a truck

geometry. By changing the rear shape the drag force induced

by the oncoming air flow was reduced, and the overall

coefficient of drag (CD) value lowered. There is also an

investigation as to how an added suction slot, and that slots

location, affects the CD.

Computational Fluid Dynamics (CFD) in the form of

the commercial computer software STAR-CCM+ was used

to simulate the flow around the GTS, and the results were

verified with similar studies and experiments [3] on the

same geometry. RANS equations and Menter k-! SST turbulence

model was used for all simulations.

The results show that CD can be lowered by 21% compared

to a baseline case. Further on the added suction

slots can reduce drag, but depending on slot location also

can add to the drag force experienced by the GTS.

Place, publisher, year, edition, pages
2015. , 86 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-170778OAI: oai:DiVA.org:kth-170778DiVA: diva2:839839
Educational program
Master of Science in Engineering -Engineering Physics
Supervisors
Examiners
Available from: 2015-07-06 Created: 2015-07-06 Last updated: 2015-07-06Bibliographically approved

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