The NASA USM3D flow solver was used to compute test cases for the Third AIAA Sonic Boom Prediction Workshop (SBPW3). The test cases include a nearfield biconvex shock-plume interaction wind tunnel model and the C608 Low Boom Flight Demonstrator. Numerical simulations were conducted on the mixed-element and tetrahedral grids provided by the workshop committee, as well as a family of grids generated by an in-house approach for sonic boom analyses known as BoomGrid. The nearfield pressure signatures were extracted, propagated to the ground and the perceived loudness levels on the ground were computed. The USM3D nearfield pressure signatures, corresponding ground signatures, and loudness levels on the ground are compared with that of mean values from other workshop participants. The effect of three flux-limiters on the accuracy of nearfield pressure signature prediction was investigated and results are compared with that of mean values from other workshop participants. The effect of using wall function grids in accurately predicting nearfield pressure signatures was also evaluated.
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机译:NASA USM3D Flow Solver用于计算第三AIAA Sonic Boom预测研讨会(SBPW3)的测试用例。测试用例包括近场Biconvex冲击羽流互动风洞模型和C608低繁荣飞行演示。在研讨会委员会提供的混合元素和四面体网格上进行了数值模拟,以及由被称为Boomgrid的Sonic Boom分析的内部方法产生的一系列网格。提取附近的压力签名,传播到地面,计算地面上的感知响度水平。将USM3D接近地面压力签名,对应的地面签名和地面的响度水平与其他研讨会参与者的平均值进行比较。研究了三个助焊剂对近场压力签名预测精度的影响,并将结果与其他研讨会参与者的平均值进行了比较。还评估了使用壁函数网格在准确预测附近压力签名中的效果。
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