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Development of new method for flow computations in vehicle ventilation ducts
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

It is desired by the CFD-engineers of the Climate team at Volvo Cars to be able to estimate the accuracy of the computed pressure drop over ventilation ducts in cars. It is also of interest to be able to accurately predict the velocity distribution in the ducts for a better prediction of the distribution in the car compartment. The present method of creating computational models of the ducts involves the use of `Wall Functions' in order to model the near wall region. An alternative method has been developed in this thesis work in which the boundary layer is fully resolved. This implies a different grid in the computational domain, different turbulence models have also been tested with the alternative method. The ventilation duct chosen for this study is the B-pillar duct. Unfortunately no test data are available for this duct and an academic experimental case has been used in order to investigate the impacts of the alternative method and also to investigate the accuracy of the present method. The results from the academic case study were used as input when models of the B-pillar duct were created. From the study of the academic case it was shown that the grid resolution of a model is of great importance in order to accurately predict the velocity distribution. A much higher grid resolution than what is generally obtained in the B-pillar duct models when using the present method must be achieved if it is desired to predict the velocity field in the ducts. Due to differences between the academic case and the B-pillar duct case and since no test data are available for the B-pillar duct, the accuracy of the computed pressure drop over the ventilation duct is difficult to estimate. Commonly for both cases were however that simulations with models created according to the alternative method resulted in a higher pressure drop than simulations with models created according to the present method.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Strömningsmekanik, CFD, Kanalflöde, beräkningsmetod
Keyword [sv]
URN: urn:nbn:se:ltu:diva-56530ISRN: LTU-EX--05/110--SELocal ID: d4b230ce-60c4-4edc-90ac-d600db89b9d6OAI: diva2:1029917
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

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