Accurate Prediction of the Flow Around a Truck and the Asymmetry of a Notchback Ahmed Body

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dc.contributor.authorMattsson, Joacim
dc.contributor.departmentChalmers tekniska högskola / Institutionen för tillämpad mekaniksv
dc.contributor.departmentChalmers University of Technology / Department of Applied Mechanicsen
dc.date.accessioned2019-07-03T14:24:20Z
dc.date.available2019-07-03T14:24:20Z
dc.date.issued2016
dc.description.abstractPartially Averaged Navier Stokes is a turbulence model purported to seamlessly shift between RANS and LES solution to achieve an accurate solution in a cost effective manner. The simulations were carried out in the commercial software AVL FIRE. The purpose of this thesis was to show that PANS can be used to achieve results in good comparison to the references. The flow around a generic truck, consisting of to boxes connected by two cylinders, was simulated at a Reynolds number of 510 000 based on the height of the trailer of the truck, using Partially Averaged Navier Stokes. The simulated flow turned steady after some simulated physical time. This was not expected to happen for such a blunt body, neither did it happen in the reference Large Eddy Simulation of the same body. Different numerical schemes, sizes of meshes, boundary conditions, and even workstations were used but all configuration gave these perplexing results. Also the flow around a fully detailed half scale truck from VOLVO AB in a wind tunnel were meant to be simulated at a Reynolds number of 4:5 106. However due to some computational difficulties no meaningful results could be found. These difficulties included problems saving data files, which is theorized to be due to memory running out on the computational cluster. Lastly a notchback Ahmed Body was simulated to try to reproduce the asymmetry of the wake that earlier has been seen in experiments. The flow was simulated at a Reynolds number of 1:9 106 based on the length of the body. No asymmetry of the flow was seen in the current work which contradicts the reference.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/246127
dc.language.isoeng
dc.relation.ispartofseriesDiploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden : 2016:69
dc.setspec.uppsokTechnology
dc.subjectStrömningsmekanik
dc.subjectHållbar utveckling
dc.subjectTransport
dc.subjectFluid mechanics
dc.subjectSustainable Development
dc.subjectTransport
dc.titleAccurate Prediction of the Flow Around a Truck and the Asymmetry of a Notchback Ahmed Body
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeApplied mechanics (MPAME), MSc
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