Efficient Near-Field to Mid-Field Sonic Boom Propagation Using a High-Order Space Marching Method

[摘要] An efficient strategy for propagating sonic boom signatures from a near-field Computational Fluid Dynamics (CFD) solution to the mid-field is presented. The method is based on a high-order accurate finite-difference discretization of the 3D Euler equations on a specially designed curvilinear grid and a single sweep space marching solution algorithm. The new approach leads to more than a factor of two reduction in overall computational resources compared to the current method used to propagate near-field sonic booms to the ground. Accuracy and efficiency of the near-field to mid-field process is demonstrated using a selection of test cases from the AIAA Sonic Boom Prediction Workshops. Azimuthal dependence of nonlinear wave propagation from the near-field to mid-field is analyzed along with its effects on the ground level noise.

[发布日期] 2019-06-17

[学科分类] 力学，机械学

[关键词] COMPUTATIONAL FLUID DYNAMICS;NEAR FIELDS;SONIC BOOMS;WAVE PROPAGATION;FINITE DIFFERENCE THEORY;DIFFERENTIAL EQUATIONS;AZIMUTH;ALGORITHMS