@inproceedings{oai:jaxa.repo.nii.ac.jp:00047329,
 author = {池田, 友明 and IKEDA, Tomoaki},
 book = {宇宙航空研究開発機構特別資料: 流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン論文集, JAXA Special Publication: Proceedings of Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online},
 month = {Feb},
 note = {流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2020オンライン (2020年9月28日-30日. 日本航空宇宙学会 : 宇宙航空研究開発機構(JAXA)オンライン会議), Fluid Dynamics Conference / Aerospace Numerical Simulation Symposium 2020 Online (September 28-30, 2020. The Japan Society for Aeronautical and Space Sciences : Japan Aerospace Exploration Agency (JAXA), Online meeting), The inhomogeneous wave equation (IWE) solver has been developed in JAXA in the framework of discretization on homogeneous Cartesian grid, to solve acoustic propagation with local convection effects, as well as acoustic interference with solid wall, such as reflection, diffraction, and scattering. In this study, the order of accuracy of the present IWE solver is investigated. First, the practical accuracy in the acoustic scattering on an isolated vortex is numerically evaluated as a verification study for the acoustic propagation in inhomogeneous flow. The resultant order of accuracy is close to 6, which coincides with the discretization error of convection terms. In addition, the accuracy of the immersed boundary method implemented in the present solver is assessed by using a one-dimensional wall reflection problem. The supposed accuracy of immersed boundary is second order at most, as second-order accurate schemes are used for the Neumann boundary condition, and linear interpolation is utilized to identify the wall location. However, the attained accuracy in the one-dimensional problem is third order. Moreover, in some specific cases, fifth-order accuracy is obtained. The third-order accuracy is also achieved in a two-dimensional problem with wall reflection., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA2030013008, レポート番号: JAXA-SP-20-008},
 pages = {53--57},
 publisher = {宇宙航空研究開発機構(JAXA), Japan Aerospace Exploration Agency (JAXA)},
 title = {直交格子上の有限差分法による非一様波動方程式解法の精度検証},
 volume = {JAXA-SP-20-008},
 year = {2021}
}