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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
CFD Analysis of the Installation Effect on a Truck's Generic Side-View Mirror
Submission Author:
Eduardo Carvalho , SP , Brazil
Co-Authors:
Eduardo Carvalho, Andre Fernando de Castro da Silva
Presenter: Eduardo Carvalho
doi://10.26678/ABCM.ENCIT2020.CIT20-0452
Abstract
Transportation is one of the human activities that most consumes natural resources. Freight by truck is a cornerstone of this process, and they typically suffer from aerodynamic inefficiency. Of all truck components, side-view mirrors remain to have substantial aerodynamic relevance. Past studies point out that they contribute with 3-6% of the truck's total drag. Characterized by the presence of a strong wake, the flow interaction between truck and mirror plays a fundamental role in making the flow past a side-view mirror complex. A proper investigation about how the presence of the cabin interferes in the flow-field on the side of the truck can shed light on some methodological questions. In particular, the issue of when simplified mirror-only experimental/simulation data can be used to make inferences about the performance of installed mirror. Such knowledge would allow experiments/simulations of lower cost to be used to study certain aspects of the flow. This work seeks to achieve this by simulating a two-dimensional version of the flow past side-view mirrors with and without the installation effect and comparing its impacts. Furthermore, reliable flow information is obtained through the use of Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations and analysed with the Spectral Proper Orthogonal Decomposition (SPOD) technique. Even though the results highlight some degree of similarity in how the vortex shedding relates to the instantaneous drag in both cases, the time-averaged drag coefficient turns out to be considerably higher in the presence of the installation effect. Furthermore, the SPOD modes are considerably different when considering the installation effect, indicating more complexity in the existing time-coherent flow structures and even the addition of new ones.
Keywords
Truck Aerodynamics, Side-View Mirror, Installation Effect, CFD, SPOD
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