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Transient thermal management simulations of complete heavy-duty vehicles
KTH, School of Engineering Sciences (SCI), Mechanics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Transient vehicle thermal management simulations have the potential to be an important tool to ensure long component lifetimes in heavy-duty vehicles, as well as save development costs by reducing development time. Time-resolved computational fluid dynamics simulations of complete vehicles are however typically very computationally expensive, and approximation methods must be employed to keep computational costs and turn-around times at a reasonable level. In this thesis, two transient methods are used to simulate two important time-dependent scenarios for complete vehicles; hot shutdowns and long dynamic drive cycles. An approach using a time scaling between fluid solver and thermal solver is evaluated for a short drive cycle and heat soak. A quasi-transient method, utilizing limited steady-state computational fluid dynamics data repeatedly, is used for a long drive cycle. The simulation results are validated and compared with measurements from a climatic wind tunnel. The results indicate that the time-scaling approach is appropriate when boundary conditions are not changing rapidly. Heat-soak simulations show reasonable agreement between three cases with different thermal scale factors. The quasi-transient simulations suggest that complete vehicle simulations for durations of more than one hour are feasible. The quasi-transient results partly agree with measurements, although more component temperature measurements are required to fully validate the method.

Place, publisher, year, edition, pages
2019. , p. 76
Series
TRITA-SCI-GRU ; 2019:408
Keywords [en]
Transient, Time-resolved, Vehicle thermal management, Complete vehicle, Dynamic boundary conditions, Drive cycle, Hot shutdown, Heat soak, Heavy-duty vehicles, Heavy trucks, Thermal scale factor, Quasi-transient, Computational fluid dynamics.
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-266464OAI: oai:DiVA.org:kth-266464DiVA, id: diva2:1385232
External cooperation
Scania
Supervisors
Examiners
Available from: 2020-01-13 Created: 2020-01-13 Last updated: 2020-01-16Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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