宽频声传播计算中多自由度时域阻抗边界条件的适定性

Well-posedness of the multi-freedom time domain impedance boundary condition for broadband sound propagation numerical simulation

旨在验证一种多自由度时域阻抗边界条件在宽频声传播问题中的适用性与精度.选用NASA(美国国家航空航天局)流管实验数据进行数值校核;采用高精度计算气动声学方法数值求解线化欧拉方程.计算结果与实验数据及单频结果均吻合很好,表明了该多自由度时域阻抗边界条件具备精确处理宽频声传播问题的能力.

The main objective is to validate the feasibility and accuracy of a multi-freedom time domain impedance boundary condition for broadband sound propagation problems.The NASA（National Aeronautics and Space Administration） grazing incidence tube experiment data was selected for numerical validation.The linearized Euler equation was solved by a high order computational aeroacoustics approach.The obtained numerical results are in good agreement with both the experimental data and results from single frequency simulation.It is demonstrated that the multi-freedom broadband impedance boundary condition is viable and accurate for the description of broadband sound propagation over impedance surfaces.