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The aim of this presentation is to show the ability of STAR-CCM+ to simulate unsteady aerodynamics, using both moving mesh and moving reference frame, in order to evaluate damping derivatives of the NACA 0012 airfoil. The simulations have been performed with STAR-CCM+ for 2D, unsteady, turbulent flow field and animating motions using a JAVA-macro written ad-hoc. The unsteady forces and moments acting on the airfoil have been directly compared with the exact theory of Theodorsen. The match between CFD end analytical data is very good. This lays the right foundation to calculate damping...
This paper presents the leakage performance of various stepped labyrinth seals. A stationary seal test rig was set up and the leakage characteristics of three seal configurations with different numbers of steps and teeth were investigated for wide operating ranges in terms of pressure ratio and tip clearance. Both the solid and honeycomb land structures were tested. In the honeycomb case, two different sizes were used. The seal was shaped, typical of labyrinth seals for gas turbine applications. The influences of seal configuration, and clearance and honeycomb sizes on the leakage performance...
The aerodynamics of a finite-span rectangular wing is investigated using a numerical method. A high-lift single element airfoil section is used. The study focuses on the effect of the ground clearance (the vertical distance between the leading edge of the wing and the ground). The study includes the effect on the overall characteristics of the flow around the wing and the generated aerodynamic forces (down force and drag). Two wings are used in the study with and without end plates. The CFD code “STAR CCM+” is used in the study. The study showed that there is a range of ground clearance where...
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.

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