@inproceedings{oai:jaxa.repo.nii.ac.jp:00038269,
 author = {小幡, 茂男 and Obata, Shigeo},
 book = {航空宇宙技術研究所特別資料: 航空宇宙数値シミュレーション技術シンポジウム2002論文集, Special Publication of National Aerospace Laboratory: Proceedings of Aerospace Numerical Simulation Symposium 2002},
 month = {Mar},
 note = {The baroclinic torque, which is generated by spatial misalignment between density gradient and pressure one, can induce a large vortical structure in mixing layer of air and fuel gas. In case of single passage of normal shock wave through 2-D circular helium bubble floating in air it have already been clarified that the vortical motion divides the bubble into two parts and the mixing is enhanced. In this report, the influence of round-trip passage of normal shock wave on mixing state is numerically investigated by TVD formulated finite differential method for Navier-Stokes equation and chemical species mass conservation equations. The interaction of contra-directional vortices by forward propagation of incident shock wave and backward one of reflected wave from rigid wall attracts much attention. The general mixing process consists of the first division of helium bubble into two semicircular parts by the forward passage and the second division into four parts. Since the existence of time delay to start vortical motion after shock passage disturbs the interaction of the backward passage on first vortex, a shorter interval of two passages presents slow formation of the small four bubbles. Two contradictory features are observed after the backward passage, a slight mixing suppression estimated from mean concentration distribution and the elongation of boundary line separating air and helium., 資料番号: AA0045948048, レポート番号: NAL SP-57},
 pages = {268--273},
 publisher = {航空宇宙技術研究所, National Aerospace Laboratory (NAL)},
 title = {反射する垂直衝撃波による気体混合の数値解析},
 volume = {57},
 year = {2003}
}