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Today there are a large variety of drag reducing devices for heavy trucks that are commonly used, for example roof deflectors, cab side extenders and chassis fairings. These devices are often proven to be efficient, reducing the total aerodynamic resistance for the vehicle. However, the drag reducing devices are usually identical for a specific pulling vehicle, independent of the layout of the vehicle combination. In this study, three vehicle combinations were analyzed. The total length of the vehicles varied between 10.10m and 25.25m. The combinations consisted of a rigid truck in...
The aerodynamic pressure eld generated by passing vehicles was investigated providing measurements and Computational Fluid Dynamics (CFD) simulations. Furthermore,the focus is lying on heavy vehicle shapes because of their larger frontal area compared to cars. However, to understand the mechanisms for the pressure eld generation also a sedan model and a generic heavy vehicle shape was introduced. Interesting flow features are found with a clear allocation to the underbody blockage of all vehicle shapes. In addition, the influence of rotating wheels on the pressure distribution on the wall was...
Constantly lowering emissions legislation and the fact that fuel prices have increased tremendously over recent years, have forced vehicle manufacturers to develop more and more energy-efficient vehicles. The aerodynamic drag is responsible for a substantial part of the total driving resistance for a vehicle, especially at higher velocities; thus it is important to reduce this factor as much as possible for vehicles commonly operating in these conditions. In an attempt to improve transport efficiency, longer vehicle combinations are becoming more common. By replacing some of the shorter...
Automotive manufacturers have intensified their efforts to decrease the vehicle drag coefficients and weight in order to optimize fuel consumption, in all light commercial vehicles segments. The sump guard is an important component to be evaluated; it has significant influence in drag and in the total weight of vehicles. The present work intends to evaluate the sump guard component replacing steel - more commonly used in the Brazilian market - for polymeric materials. A complete study of feasibility under the light of the aerodynamics and structural analysis is made. It also considered the...
This project is an introduction on the aerodynamics of a World Rally Championship car, a subject which has only been briefly covered by published literature. Because of this, the main aim of the project is to fill this gap on the published literature using CFD simulations on a 2008 Subaru Impreza WRC S14 developed by Prodrive.The project has been focused on the design of the rear wing of the car, studying the final design that the car used and the solutions adopted by the designers. To do so, the effects that different parts from the rear wing have on the overall car have been deducted using...
With unrivaled polyhedral cell meshing, STAR-CCM+ cuts meshing time down from months to hours. Shown here is a polyhedral mesh generated on a fluidized bed geometry for pill coating.
DEM simulates the motion of a large number of interacting particles and tracks them in a numerically efficient manner, modeling contact forces and energy transfer due to collision and heat transfer between particles. Shown is a DEM simulation for a fluidized bed.
This paper presents an overview of the model development and validation of an advanced Computational Fluid Dynamics (CFD) computer code (CFD-BWR) that allows the detailed analysis of two-phase flow and heat transfer phenomena in Boiling Water Reactor (BWR) fuel bundles. The CFD-BWR code is being developed as a customized module built on the foundation of the commercial CFD-code STAR-CD which provides general two-phase flow modeling capabilities. The model development strategy that has been adopted by the development team for the prediction of boiling flow regimes in a BWR fuel bundle includes...
The paper describes advances in simulation technology for marine applications that have been achieved over the past 10 years. This includes handling of complex geometries, modeling of free-surface effects and cavitation, coupled simulation of flow and motion of floating bodies, and consideration of fluid-structure interaction. Examples from industry are used to explain the benefits obtained using modern simulation methods.
Anew code, CFD-BWR , is being developed for the simulationof two-phase flow phenomena inside a BWR fuel bundle. Thesephenomena include coolant phase changes and multiple flow regimes whichdirectly influence the coolant interaction with fuel assembly and, ultimately,the reactor performance. CFD-BWR is a specialized module built onthe foundation of the commercial CFD code STAR-CD whichprovides general two-phase flow modeling capabilities. New models describing theinter-phase mass, momentum, and energy transfer phenomena specific for BWRshave been developed and implemented in the CFD-BWR module...

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