Change search
ReferencesLink to record
Permanent link

Direct link
Fan modelling for front end cooling with CFD
2007 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis, performed at Volvo Cars, some concepts of modelling cooling fans with Computational Fluid Dynamics are evaluated by comparison with experimental data. Focus is set on the method Multiple Reference Frame (MRF) but the Body Force and Mixing Plane Models are also investigated. All measurements were carried out in Volvo Cars component test rig where pressure jump and air flow rate through a cooling fan and shroud mounted on a heat exchanger were measured. In order to make relevant comparisons, a detailed numerical model of the test rig with fan, shroud and heat exchanger were created. A mesh with high node density, in total 14 million tetrahedral elements, was used and the simulations were carried out with the standard k-å turbulence model. The comparisons were performed for different air flow rates, rotational speeds, cooling packages, and for setups with open and closed speed flaps. The Multiple Reference Frame approach reproduces fan performance with good accuracy for most cases. For these cases measured and computed data differ with less than 3.5% air flow rate. Moreover, the MRF approach generates good results for open and closed speed flaps as well as for idle conditions. It also introduces swirl leading to a realistic prediction of the velocity distribution downstream the fan. The MRF method is well suited when doing flow simulations within the engine room and is therefore recommended to use. Furthermore, improvements concerning the procedure to numerically represent heat exchangers and the use of the Body Force Model are described.

Place, publisher, year, edition, pages
Keyword [en]
Technology, fluid mechanics, CFD, computational fluid dynamics, numerical, methods, fans
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56388ISRN: LTU-EX--07/001--SELocal ID: d2abac33-c55d-486e-936d-ca8fb423df7eOAI: diva2:1029775
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

Open Access in DiVA

fulltext(1832 kB)6 downloads
File information
File name FULLTEXT01.pdfFile size 1832 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search outside of DiVA

GoogleGoogle Scholar
Total: 6 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 1 hits
ReferencesLink to record
Permanent link

Direct link