Strömningsmotstånd hos personbilar
Research Project , 2009 – 2011

The long term objective of the project is to increase the knowledge on how to design and optimize the rear part of a vehicle in order to obtain a lower drag coefficient. The project is a detailed experimental and numerical (CFD) study of the flow field around, underneath and behind passenger cars using a moving ground facilities. The idea behind the project is to use the momentum increase underneath the rear part of the vehicle for a reduction of the separated region behind the vehicle. To achive this, generic and real vehicles will be used together with introduction of active flow control of the flow phenomena. Due to the introduction of an optimized design and active control of the flow field in this area we estimate the drag reduction to be of the order of 10 %, meaning a reduction in fuel consumption for a SAAB 9-3 or 9-5 of 2-4 %. The project will also give a backgrond for more accurate full scale determination of the drag coefficient in full scale.


Lennart Löfdahl (contact)

Professor vid Chalmers, Mechanics and Maritime Sciences, Vehicle Engineering and Autonomous Systems



Linköping, Sweden


Trollhättan, Sweden

LeanNova Engineering

Trollhättan, Sweden

Saab AB

Bromma, Sweden


Swedish Energy Agency

Funding Chalmers participation during 2009–2013

More information