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Journal ArticleDOI

Aerodynamic study of state transport bus using computational fluid dynamics

01 Nov 2017-Vol. 263, Iss: 6, pp 062052
TL;DR: Around 28% improvement in the drag coefficient is achieved by CFD driven changes in the bus design and fuel efficiency increased by 20% by CFDs driven changes.
Abstract: The main purpose of this study was to develop the aerodynamic study of a Maharashtra state road transport bus. The rising fuel price and strict government regulations makes the road transport uneconomical now days. With the objective of increasing fuel efficiency and reducing the emission of harmful exhaust gases. It has been proven experimentally that vehicle consumes almost 40% of the available useful engine power to overcome the drag resistance. This provides us a huge scope to study the influence of aerodynamic drag. The initial of the project was to identify the drag coefficient of the existing ordinary type model called "Parivartan" from ANSYS fluent. After preliminary analysis of the existing model corresponding changes are made in such a way that their implementation should be possible at workshop level. The simulation of the air flow over the bus was performed in two steps: design on SolidWorks CAD and ANSYS (FLUENT) is used as a virtual analysis tool to estimate the drag coefficient of the bus. We have used the turbulence models k-e Realizable having a better approximation of the actual result. Around 28% improvement in the drag coefficient is achieved by CFD driven changes in the bus design. Coefficient of drag is improved by 28% and fuel efficiency increased by 20% by CFD driven changes.
Citations
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Journal ArticleDOI
01 Dec 2020
TL;DR: The redesigning of an existing bus carried out by considering the forces that reduce the moment of the bus by reducing the drag force and enhancing the uniform airflow inside an existing non‐air‐conditioning bus coach system.

4 citations

Journal ArticleDOI
TL;DR: In this paper , an intercity bus is chosen as a main object, and computational fluid dynamics (CFD) analysis is used to estimate aerodynamic forces on the bus in all major directions.
Abstract: The impacts of conflicting aerodynamic forces and side drifting forces are the primary unstable elements in automobiles. The action of an unstable environment in automobile vehicles increases the chance of an accident occurring. As a result, much study is required to determine how opposing aerodynamic forces and side drifting force affects function, as well as how to deal with them for safe and smooth navigation. In this work, an intercity bus is chosen as a main object, and computational fluid dynamics (CFD) analysis is used to estimate aerodynamic forces on the bus in all major directions. Experimentation is also carried out for validation reasons. CFD findings for a scaled base model and a dimple-loaded model based on experimental results from a subsonic wind tunnel are demonstrated to be correct. The drag forces generated by CFD simulations on test models are carefully compared to the experimental drag findings of same-dimensioned models. The error percentages between the results of these two methods are acquired and the percentages are determined to be within an acceptable range of significant limitations. Following these validations, CATIA is used to create a total of nine distinct models, the first of which is a standard intercity bus, whereas the other eight models are fitted with drag reduction techniques such as dimples, riblets, and fins on the surface of their upper cumulus side. A sophisticated computational tool, ANSYS Fluent 17.2, is used to estimate the comparative assessments of the predictions of aerodynamic force fluctuations on bus models. Finally, dimples on the top and side surfaces of the bus model (DESIGN–I) are proposed as a more efficient model than other models because dimples are a vital component that may lower pressure drag on the bus by 18% in the main flow direction and up to 43% in the sideslip direction. Furthermore, by minimizing the different aerodynamic force sources without impacting the preparatory needs, the proposed model may provide comfortable travel. The real-time bus is created, and the finalized drag reduction is applied to the optimized places over the whole bus model. In addition, five distinct size-based bus models are developed and studied in terms of aerodynamic forces, necessary energy to resist aerodynamic drag, required forward force for successful movement, instantaneous demand for particular power, and fuel consumption rate. Finally, the formation of aeroacoustic noise owing to turbulence is estimated using sophisticated computer simulation. Last, for real-time applications, multi-parametric studies based on appropriate intercity buses are established.

3 citations

Journal ArticleDOI
TL;DR: In this article , an aerodynamic shape of a non-AC bus was designed and three openings were provided at the leading edge of the bus, the first and second openings were mere openings and the third opening was fitted with a roof vent providing three different geometric patterns to airflow.
Abstract: Air circulation plays a vital role in the comfort of passengers in a bus, being a non-AC bus without any aid from the air conditioning system. The circulation of air is utterly dependent on the design of the bus and the natural flow of air. However, optimize the flow of air inside the bus, a study on the design of the bus is needed. In this regard, experimental work was carried out to achieve uniform airflow by redesigning the coach into an aerodynamic shape. The openings are provided at the leading edge of the bus to evaluate the best possibility for air to circulate in the bus. Three openings were provided at the leading edge of the bus, the first and second openings were mere openings, and the third opening was fitted with a roof vent providing three different geometric patterns to airflow. The initial boundary conditions were developed by considering that all windows and doors of the bus are closed. The scaling ratio of 1:20 was considered for modeling the bus. The experiments were conducted in the wind tunnel test rig. It was observed from the experimentation that the velocity of the air was considered to be the most influential parameter for the optimal air circulation. The velocities of 21.96 m/s and 22.68 m/s were obtained inside bus. The obtained experimental velocities were validated with results obtained by the Computational Fluid Dynamics (CFD). It was observed that a deviation of 5% for the given velocity of 20 m/s. doi: 10.5829/ije.2022.35.03c.10

2 citations

Journal ArticleDOI
01 Feb 2021
TL;DR: The present research work emphasis on design and analysis of air flow duct system (non AC Busses) to increase the level of comfortance of the passengers and a negligible deviation of 2% is observed and it is within the limit.
Abstract: Public transport is the life line in many of the developing and under developed countries for the safe conveyance, i.e. also consider as economical. The major limitation in public transport (non-AC busses) Air Condition, is the lack of proper air circulation leading to suffocation and vomiting. The present research work emphasis on design and analysis of air flow duct system (non AC Busses) to increase the level of comfortance of the passengers, tools like solidworks software 2016 is used for 3D drawing, Hypermesh software 13.0 is for the discretization and ANSYS Fluent software 16.0 for the Computational Fluid Dynamic (CFD) analysis, from the experimental the airflow is found to be 10 m/s, and from the numerical analysis the airflow is found to be 9.8 m/s, by comparing the experimental and numerical results a negligible deviation of 2% is observed and it is within the limit.

1 citations


Cites background or methods from "Aerodynamic study of state transpor..."

  • ...This air pressure is utilized by using a duct that is placed in the optimal location using CFD analysis [8]....

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  • ...[8] Siddhesh Kanekar, Prashant Thakre and E Rajkumar “Aerodynamic study of state transport bus using computational fluid dynamics”, IOP Conf....

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Book ChapterDOI
01 Jan 2022
References
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Proceedings ArticleDOI
TL;DR: In this paper, a three-dimensional near field flow analysis has been performed for axial and cross wind loading to understand the airflow characteristics surrounding a truck-like bluff body and associated drag for the truck geometry including the exterior rearview mirror.
Abstract: Aerodynamics of trucks and other high sided vehicles is of significant interest in reducing road side accidents due to wind loading and in improving fuel economy. Recognizing the limitations of conventional wind tunnel testing, considerable efforts have been invested in the last decade to study vehicle aerodynamics computationally. In this paper, a three-dimensio nal near field flow analysis has been performed for axial and cross wind loading to understand the airflow characteristics surrounding a trucklike bluff body. Results provide associated drag for the truck geometry including the exterior rearview mirror. Modifying truck geometry can reduce drag, improving fuel economy.

36 citations

Book
01 Jan 1987

28 citations

01 Jan 2011
TL;DR: In this paper, an intercity bus with enhanced exterior styling reduced aerodynamic drag and increased comfort for the passengers, and the interior was modified to meet the aspirations of the commuters.
Abstract: For buses which covers long distances in a single stretch, improved aerodynamic design with good aesthetics attracts customers besides saving fuel consumption. Ergonomic design of interiors for increased comfort of the passengers also plays a vital role. In the present work emphasis is given on the redesign of an intercity bus with enhanced exterior styling reduced aerodynamic drag and increased comfort for the passengers. Extensive product study and market study are carried out. Existing intercity bus is benchmarked and analyzed for styling, aerodynamic performance and comfort. Fluent, a CFD code is used to evaluate the aerodynamic performance. Principles of product design are used to analyze the styling and comfort. The benchmarked high- floor bus is redesigned with low - floor for reduced aerodynamic drag. The exterior of the chosen bus is redesigned with emphasis on improvised aerodynamic performance and appealing looks. The interior was modified to meet aspirations of the commuters. The results of the redesigned exterior body showed a reduction of Cd from 0.581 to 0.41 at a speed of 100 km/hr and overall aerodynamic drag reduction by about 30% due to combined effect of reduced C d and frontal area.

4 citations