Ship performance monitoring and analysis to improve fuel efficiency

Heavy commercial vehicles due to their un-streamlined body shapes are aerodynamically inefficient due to higher fuel consumption as compared to passenger vehicles. The rising demand and use of fossil fuel escalate the amount of carbon dioxide emitted to the environment, thus more efficient tractor-trailer design becomes necessary to be developed. Fuel consumption can be reduced by either improving the driveline losses or by reducing the external forces acting on the truck. These external forces include rolling resistance and aerodynamic drag. When driving at most of the fuel is used to overcome the drag force, thus aerodynamic drag proves an area of interest to study to develop an efficient tractor-trailer design. Tractor-trailers are equipped with standard add-on components such as roof defectors, boat tails and side skirts. Modification of these components helps reduce drag coefficient and improve fuel efficiency. The objective of this study is to determine the most effective geometry of trailer add-on devices in semi-truck trailer design to reduce the drag coefficient to improve fuel efficiency and vehicle stability. The methodology consisted of CFD analysis on Mercedes Benz Actros using ANSYS FLUENT. The simulation was performed on the tractor-trailer at a speed of 30m/s. The analysis was performed with various types of add-on devices such as side skirts, boat tail and vortex generators. From the simulation results, it was observed that addition of tractor-trailer add-on devices proved beneficial over modifying trailer geometry. Combination of add-on devices in the trailer underbody, rear and front sections was more beneficial in reducing drag coefficient as compared to their individual application. Improving fuel efficiency by 17.74%. Stability of the tractor-trailer is improved due to the add-on devices creating a streamlined body and reducing the low-pressure region at the rear end of the trailer.

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The Role of Communications in Cyber-Physical Vehicle Applications

Automotive Informatics and Communicative Systems ◽

10.4018/978-1-60566-338-8.ch008 ◽

2010 ◽

pp. 139-161 ◽

Cited By ~ 4

Author(s):

Nicholas F. Maxemchuk ◽

Patcharinee Tientrakool ◽

Theodore L. Willke

Keyword(s):

Fuel Efficiency ◽

Cyber Physical Systems ◽

Transportation Infrastructure ◽

Physical Systems ◽

Traffic Lights ◽

Improve Fuel Efficiency ◽

Efficiency Increase ◽

Control Traffic ◽

Transportation Applications

Cyber-physical systems use sensing, communications, and computing to control the operation of physical devices. Sensing and computing devices have been embedded in automobiles and in the transportation infrastructure. Communications adds a new dimension to the capabilities of these systems. The embedded computers and sensors in both vehicles and the infrastructure will be networked into cyber-physical systems that reduce accidents, improve fuel efficiency, increase the capacity of the transportation infrastructure, and reduce commute times. The authors describe applications that improve the operation of automobiles, control traffic lights, and distribute the load on roadways. The requirements on the communications protocols that implement the applications are determined and a new communications paradigm, neighborcast, is described. Neighborcast communicates between nearby entities, and is particularly well suited to transportation applications.

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An Open-Source Framework for Ship Performance CFD

10.5957/tos-2021-22 ◽

2021 ◽

Author(s):

Bjorn Winden

Keyword(s):

Open Source ◽

Fuel Efficiency ◽

Bulk Carrier ◽

Steep Learning Curve ◽

Successful Model ◽

Continuous Innovation ◽

Current State ◽

Open Source Framework ◽

Computational Fluid Dynamics Cfd ◽

Ship Performance

Development of novel hydrodynamic solutions to meet the demands for fuel efficiency of the future merchant fleet will require continuous innovation in the Computational Fluid Dynamics (CFD) methods being used. This is especially true when considering the development of Energy Saving Devices (ESDs). Open-source CFD is a way to allow more researchers to participate in this process and to accelerate innovation. This paper presents an open-source framework for conducting ship performance analyses within the OpenFOAM CFD suite. The framework helps to alleviate the steep learning curve for initially setting up a successful model of a self-propelled ship in OpenFOAM. It is demonstrated that, using this framework, results in line with the current state of the art set by leading institutions and commercial solvers can be obtained for the performance of a bulk carrier fitted with an ESD. Two different models for describing the action of the propeller on the fluid are explored and conclusions are drawn from comparisons with available experimental data.

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