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The use of models to test future aircraft, spacecraft, and automobiles are critical, and a wind tunnel is one of the tools used to test models and, in some cases, actual aircraft. Before allowing aircraft and spacecraft to leave the atmosphere, they must be thoroughly tested. The Yaw sphere's systematic and true flow analysis emphasizes the importance of the size and speed of the model. Engineers can use the Yaw sphere to test a range of alternative configurations to improve the performance of aircraft and vehicles in terms of lift, drag force, and fuel economy. Traditionally, research was conducted using apt wind tunnels of various Mach numbers or from the help of numerical analysis, but in the recent scenario, experimental findings are achieved utilizing the wind tunnel test facility. Before testing a model, the rate of maturity and flow frameworks, such as strain, temperature, velocity, flow angularity, density distribution, and turbulence must be checked in the test section. Instead of using a linear technique, the X, Y, and Z approach the flow of plane fields that are used. The tool can be used to analyze the field flow and maturity degree inside the test segment. This report, which may include a data of field flow diagram of test items, further enables the investigation and analysis. As part of this survey, about 3 of South India's wind tunnel's truthfulness is being investigated. For the chosen wind tunnel, a flow framework forecast will be established systematically. The map of data for this flow function will offer decaying velocity and velocity profiles to various ranges of Mach numbers. [ABSTRACT FROM AUTHOR]

Design optimization of the vehicle has been an integral part of Vehicle Aerodynamics. The reason so much heed is given to this research area is due to the ever-growing concern of detrimental effects of fuel on the environment. This paper aims to optimize the shape of auto-rickshaw which is one of the most widely used vehicles in India. Being the developing nation, people use auto-rickshaw because it is economical which makes it essential to modify the design to reduce drag. This, in turn, improves the fuel efficiency of the auto-rickshaw. The impact of the addition of diffuser at the underbody along with varying slant angle at the rear side to provide boot area is studied. The modifications are done on CATIA V5 followed by investigating the coefficient of drag on ANSYS Fluent. [ABSTRACT FROM AUTHOR]