Near-To-Mid Field Sonic Boom Simulation Using a Space Marching Method with Atmospheric Stratification

To enable future supersonic passenger airplane with overland flight, it is necessary to develop design technology that can suppress sonic booms on the ground and to establish international standards for overland supersonic flight. Numerical analysis of sonic booms not only on the ground but also in the near and mid-field is required with high accuracy. To design and develop a more robust low boom supersonic airplane under all possible conditions of actual flight operation, the range of the near-to-mid field should be 10 times or more the length of the airplane. In this paper, a space marching analysis is applied to estimate the sonic boom in the near-to-mid field with high accuracy and high efficiency. However, while the space marching method can be analyzed up to 10 times or more away from the airplane, atmospheric conditions, such as atmospheric pressure, change along with altitude when the distance from the airplane is long. This is called a “atmospheric stratification”. The authors developed a method that adds the effect of atmospheric stratification to the space marching method. This paper describes the method and its effect of the space marching method with atmospheric stratification.