@inproceedings{oai:jaxa.repo.nii.ac.jp:00003854, author = {寺門, 大毅 and 野々村, 拓 and 佐藤, 允 and 藤井, 孝藏 and Terakado, Daiki and Nonomura, Taku and Sato, Makoto and Fujii, Kozo}, book = {宇宙航空研究開発機構特別資料: 第46回流体力学講演会/第32回航空宇宙数値シミュレーション技術シンポジウム論文集, JAXA Special Publication: Proceedings of the 46th Fluid Dynamics Conference / 32nd Aerospace Numerical Simulation Symposium}, month = {Mar}, note = {第46回流体力学講演会/第32回航空宇宙数値シミュレーション技術シンポジウム (2014年7月3日-4日. 弘前文化センター), 弘前市, 青森県, 46th Fluid Dynamics Conference / 32nd Aerospace Numerical Simulation Symposium (July 3-4, 2014. Hirosaki Bunka Center), Hirosaki, Aomori, Japan, We investigate the effects of compressibility on sound source distributions using direct numerical simulations of isotropic decaying compressible turbulence at various turbulent Mach numbers. The sound source is obtained numerically from the Lighthill equation. As a first step, we study the sound source from the Reynolds stress, which is the dominant source in flows at low Mach numbers. We find that, as the Mach number is increased, overall sound source levels are weakened by thecompressibility; however, once the supersonic region appears, sound generation associated with shocklets occurs. This sound generation strengthens the overall sound source levels in the high Mach number turbulence., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1530023019, レポート番号: JAXA-SP-14-010}, pages = {105--111}, publisher = {宇宙航空研究開発機構(JAXA), Japan Aerospace Exploration Agency (JAXA)}, title = {一様等方性圧縮性乱流の音源分布}, volume = {JAXA-SP-14-010}, year = {2015} }