Report Number: R16E0051 Responsible Representative: Masayuki Takahashi(The University of Tokyo) Contact Information: Masayuki Takahashi(mtakahashi@rhd.mech.tohoku.ac.jp) Members: Masayuki Takahashi Subject Category: Space(Space transportation) Abstract Plasma simulations with kinetic particle and fluid models were coupled with an electromagnetic field propagation to reproduce the breakdown structure in a beamed-energy propulsion system. The compressible fluid simulation was also conducted to reproduce the shock wave propagation around the vehicle. Thrust performance and flight stability of the vehicle were improved by applying an external magnetic field into・・・<<read more>>
Report Number: R16E0050 Responsible Representative: Naofumi Ohnishi(Tohoku University) Contact Information: Naofumi Ohnishi(ohnishi@rhd.mech.tohoku.ac.jp) Members: Naofumi Ohnishi, Shintaro Sato Subject Category: Basic Research(Numerical analysis) Abstract We conducted numerical simulations of the discharge process in the DBD plasma actuator to improve the induced flow velocity. Clarification of the discharge process is a key issue because the flow is induced by the electrohydrodynamic force caused by the discharge. The relationship between the voltage waveform and discharge regime was investigated. A wall jet is reproduced・・・<<read more>>
Report Number: R16E0049 Responsible Representative: Naofumi Ohnishi(Tohoku University) Contact Information: Naofumi Ohnishi(ohnishi@rhd.mech.tohoku.ac.jp) Members: Hiroaki Tatematsu, Naofumi Ohnishi Subject Category: Space(Spacecraft) Abstract Unstable modes were obtained by conducting dynamic mode decomposition to field data calculated by numerical simulation of hypersonic flow around a sharp cone which was used in past experiment. The characteristic mode was extracted and had the similar structure to the second mode, which is considered as an unstable mode. Moreover, different frequencies were obtained between the modes in・・・<<read more>>
Report Number: R16E0048 Responsible Representative: Ko-ichiro Sugiyama(Matsue College) Contact Information: Ko-ichiro Sugiyama(sugiyama@gfd-dennou.org) Members: Hiroki Ando, Ko-ichiro Sugiyama Subject Category: Space(Moon Planet,Space philosophy) Abstract Gravity waves influence the atmospheric motion due to the heat and momentum transports associated with their propagation and breaking. In order to investigate propagation and breaking of the gravity waves main source of which is convection, we perform numerical experiment using our cloud resolving model. Our results indicate that their breaking is caused by shear instability and・・・<<read more>>
Report Number: R16E0047 Responsible Representative: Kazuo Matsuura( Graduate School of Science and Engineering) Contact Information: Kazuo Matsuura(matsuura.kazuo.mm@ehime-u.ac.jp) Members: Kazuo Matsuura Subject Category: Basic Research(Numerical analysis,CFD,other ) Abstract Boundary layer transition around a solid object is important in order to predict the condition for stable engine operation and the distribution of heat transfer when an airplane flies at the speed five times faster than the speed of sound. Vortex dynamics occurring inside the boundary layer is investigated usingsupercomputer. Also, mathematical techniques・・・<<read more>>
