scholarly journals Drag reduction in a class 8 truck - scaled down model

2018 ◽  
Vol 172 ◽  
pp. 01003
Author(s):  
R Vishwa Krishna. ◽  
R Suwathy. ◽  
M Pragadeesh. ◽  
M Venkatesan.
Keyword(s):  
Numerical Model ◽  
Drag Coefficient ◽  
Heavy Duty ◽  
Commercial Vehicles ◽  
Heavy Load ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Class 8 Truck ◽  
Gap Width ◽  
Front Radius

Trucks are heavy load vehicles used mainly for commercial transport operations. There are several classes of heavy duty commercial vehicles classified based on the weight loaded. More than 50% of the engine output power in such trucks is utilized to overcome the drag. Drag force in automobiles is the resistance offered by air on vehicles at higher speeds. Class 8 trucks suffer higher drag when compared to other classes. In the present work, a numerical model is developed using a commercial code ANSYS FLUENT to predict the drag coefficient value. The effects of gap width and cab front radius with a constant fairing is analysed using the numerical model developed. A Class 8 model truck with minimal drag coefficient having constant fairing and optimized gap width between the trailer and cab is proposed.

Feasibility of Standardized Diagnostic Device for Maintenance and Inspection of Commercial Motor Vehicles

1996 ◽  
Vol 1560 (1) ◽  
pp. 48-56
Author(s):  
Dan Middleton ◽  
John Rowe
Keyword(s):  
Motor Vehicles ◽  
Electronic Systems ◽  
Heavy Duty ◽  
Commercial Vehicles ◽  
Vehicle Operation ◽  
Heavy Truck ◽  
Maintenance And Inspection ◽  
New Applications ◽  
Class 8 Truck ◽  
Year 2000

The rapid growth in the number of trucks on the nation's highways combined with the fact that safety violation rates have not declined significantly have created an urgency to increase the efficiency of heavy-truck inspections. At the same time, the growing number of on-board electronic systems are delivering more information than ever before about key components of vehicle operation. The objective of this study is to determine whether it would be feasible to standardize electronic diagnostic interface systems and use them to help make roadside inspection faster, more accurate, and less constrained by shortages of qualified inspection personnel. The study found that electronics has made significant inroads into components of heavy-duty commercial vehicles. In addition to widely adopted systems, such as electronically controlled engines, transmissions, and antilock brakes, the technology exists for a number of new applications. The heavy-duty Class 8 truck of the year 2000 and beyond could be equipped with as many as 50 electronic systems but more likely with three to seven intelligent control devices for the engine, transmission, brakes, retarder, instrument cluster, trip recorder, and off-board communications. There is potential for using these electronics in roadside inspections as standardization efforts by the Society of Automotive Engineers and The Maintenance Council successfully continue if the proper on-board parameters are made available to inspectors.

scholarly journals Drag Reduction of Passenger Car Using Add-On Devices

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Ram Bansal ◽  
R. B. Sharma
Keyword(s):  
Numerical Model ◽  
Drag Coefficient ◽  
Flow Structure ◽  
Lift Coefficient ◽  
Vortex Generator ◽  
Ansys Fluent ◽  
Passenger Car ◽  
Aerodynamic Efficiency ◽  
Computational Fluid Dynamics Cfd ◽  
Ansys Workbench

This work proposes an effective numerical model using the Computational Fluid Dynamics (CFD) to obtain the flow structure around a passenger car with different add-on devices. The computational/numerical model of the passenger car and mesh was constructed using ANSYS Fluent which is the CFD solver and employed in the present work. In this study, numerical iterations are completed, and then aerodynamic data and detailed complicated flow structure are visualized. In the present work, a model of generic passenger car was developed using solidworks, generated the wind tunnel, and applied the boundary conditions in ANSYS workbench platform, and then testing and simulation have been performed for the evaluation of drag coefficient for passenger car. In another case, the aerodynamics of the most suitable design of vortex generator, spoiler, tail plates, and spoiler with VGs are introduced and analysed for the evaluation of drag coefficient for passenger car. The addition of these add-on devices are reduces the drag-coefficient and lift coefficient in head-on wind. Rounding the edges partially reduces drag in head-on wind but does not bring about the significant improvements in the aerodynamic efficiency of the passenger car with add-on devices, and it can be obtained. Hence, the drag force can be reduced by using add-on devices on vehicle and fuel economy, stability of a passenger car can be improved.

scholarly journals Numerical investigation of the drag force reduction for homogeneous column of vehicles

2019 ◽  
Vol 2 (1) ◽  
pp. 524-531
Author(s):  
Władysław Hamiga ◽  
Wojciech Ciesielka
Keyword(s):  
Numerical Model ◽  
Drag Coefficient ◽  
Reference Structure ◽  
Ansys Fluent ◽  
Drag Forces ◽  
Large Size ◽  
Mesh Independence ◽  
Body Reference ◽  
Force Reduction ◽  
Volume Method

Abstract This paper presents simulation studies on the aerodynamics of vehicles moving in an organized column. The object of research is a column that consist of three vehicles of the same type (homogeneous column). In this research geometry of Ford Transit was used. As a part of the studies, the air drag forces acting on individual vehicles were calculated. The results are presented in dimensionless drag coefficient. The influence of the distance between cars on the generated force was also determined. In the first stage of the work, a numerical model was developed based on the Ahmed body reference structure. The calculations were carried out for 9 different velocities. The obtained results of the drag coefficient were compared with the work of other authors. The applied turbulence model and parameters of the boundary layer were used to create a numerical model of a moving column of vehicles. Mesh independence for numerical model of van was verified. The Finite Volume Method was implemented in the ANSYS Fluent program and used for the calculations. The use of supercomputers was necessary due to the large size of the grid.

Effect of Slit Inclusions in Drag Reduction of Flow over Cylinders

2016 ◽  
Vol 846 ◽  
pp. 18-22
Author(s):  
Rohit Bhattacharya ◽  
Abouzar Moshfegh ◽  
Ahmad Jabbarzadeh
Keyword(s):  
Fluid Flow ◽  
Drag Reduction ◽  
Drag Coefficient ◽  
Finite Volume ◽  
Lattice Boltzmann ◽  
Circular Cross Section ◽  
Finite Volume Methods ◽  
Turbulent Regime ◽  
Ansys Fluent ◽  
Comparison Of The Results

The flow over bluff bodies is separated compared to the flow over streamlined bodies. The investigation of the fluid flow over a cylinder with a streamwise slit has received little attention in the past, however there is some experimental evidence that show for turbulent regime it reduces the drag coefficient. This work helps in understanding the fluid flow over such cylinders in the laminar regime. As the width of the slit increases the drag coefficient keeps on reducing resulting in a narrower wake as compared to what is expected for flow over a cylinder. In this work we have used two different approaches in modelling a 2D flow for Re=10 to compare the results for CFD using finite volume method (ANSYS FLUENTTM) and Lattice Boltzmann methods. In all cases cylinders of circular cross section have been considered while slit width changing from 10% to 40% of the cylinder diameter. . It will be shown that drag coefficient decreases as the slit ratio increases. The effect of slit size on drag reduction is studied and discussed in detail in the paper. We have also made comparison of the results obtained from Lattice Boltzmann and finite volume methods.

Failure mode investigation and re-design of heavy-duty commercial vehicle bogie bracket

2019 ◽  
Vol 43 (3) ◽  
pp. 405-415
Author(s):  
P. Thangapazham ◽  
L.A. Kumaraswamidhas ◽  
D. Muruganandam
Keyword(s):  
Maximum Stress ◽  
Suspension System ◽  
Heavy Duty ◽  
Commercial Vehicles ◽  
Road Load ◽  
Road Surfaces ◽  
Strain Data ◽  
Critical Sections ◽  
Bracket Base ◽  
Base Design

Heavy-duty commercial vehicles play a significant role in commodity logistics. For each of these vehicles, the suspension is the most essential system to support the load and road shock. Bogie type suspension system is employed to safeguard the vehicle from road shock. The bogie bracket is a juncture between the chassis and the axle in the suspension system. The bogie bracket has been identified as a critical part of the suspension system. In the present study, bogie bracket base design and modelling was performed using computer-aided engineering (CAE). The strength of the bogie was tested to identify weaker sections. Design modifications were performed to improve the strength on identified critical sections through reinforcement techniques. A road load data acquisition (RLDA) test was conducted under different road conditions to validate CAE results. Five different rough-road road surfaces were chosen for RLDA testing. Using strain gauges, strain data were acquired during the test. Corresponding stress values were obtained and maximum stress was found in all driving conditions. For the base design bogie bracket, under RLDA test, crack initiation and crack propagation were identified under vertical loads. A reinforced bogie bracket was designed and found to have a higher strength and longer expected life than that of the base design.

Controllable cooling system for heavy-duty commercial vehicles

2016 ◽  
pp. 645-661 ◽  
Author(s):  
Eberhard Pantow ◽  
David Haar ◽  
Andreas Kleber ◽  
Matthias Banzhaf
Keyword(s):  
Cooling System ◽  
Heavy Duty ◽  
Commercial Vehicles

scholarly journals Mesh independency study for an elementary perforated panel part of an air solar collector

2019 ◽  
Vol 85 ◽  
pp. 02017 ◽  
Author(s):  
Andrei-Stelian Bejan ◽  
Florin Bode ◽  
Tiberiu Catalina ◽  
Cătalin Teodosiu
Keyword(s):  
Numerical Model ◽  
Solar Collector ◽  
Metal Plate ◽  
Temperature Fields ◽  
Actual Case ◽  
Ansys Fluent ◽  
Numerical Grid ◽  
Computational Resources ◽  
Rng Turbulence Model ◽  
The Impact

In order to achieve the numerical model of a transpired solar collector (TSC) with integrated phase changing materials (PCM) it is mandatory to study the impact of the orifice geometry on the entire system. The numerical simulation of the entire solar collector absorber metal plate (1000x2000mm and 5000 orifices) is not feasible thus resulting a huge number of cells for the numerical grid for which we will need very high computational resources and a very large amount of time to be solved. By taking these aspects into account we decided to simulate only four equivalent orifices and then to transpose the results to the actual case for further studies. The present paper aims to analyse the mesh independency study for an elementary perforated panel with four equivalent lobed orifices which is part of a real case TSC. This analysis represents one of the most important stages within the construction of the TSC numerical model and doesn't need an experimental validation. The study was conducted in Ansys Fluent CFD software and the results were processed directly by using Tecplot software. Six different meshes were analysed (from 0.2 to 7.3 million cells), boundary conditions were imposed, and k-ε RNG turbulence model was used according to the literature. After comparing velocity and temperature fields in longitudinal and transverse planes we concluded that from 5.3 million cells the solution is independent of the meshing quality.

scholarly journals Experimental and numerical analysis of the biomass innovativ solar pyrolysis process

2019 ◽  
Vol 137 ◽  
pp. 01004
Author(s):  
Sebastian Werle ◽  
Szymon Sobek ◽  
Zuzanna Kaczor ◽  
Łukasz Ziółkowski ◽  
Zbigniew Buliński ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Input Data ◽  
Experimental Tests ◽  
Real System ◽  
Artificial Light ◽  
Gas Composition ◽  
Pyrolysis Process ◽  
Ansys Fluent ◽  
Main Fraction

Paper present the experimental and numerical analysis of biomass photopyrolysis process. The experimental tests is performed on the solar pyrolysis installation, designed in Institute of Thermal Technology, Gliwice. It consist of the copper reactor powered by artificial light simulating sun. The paper shows the result of the solar pyrolysis of wood. The yield of the main fraction as a function of the process temperature is presented. Additionally the gas composition is determined. The numerical model is prepared in the Ansys Fluent 18.2 software, which allow at the same time for capturing geometry of the real system and easy change of input data. The results indicate that both the product yields (liquid, solid and gaseous) and gas components shares are strongly influenced by pyrolysis parameters and feedstock composition.

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