小円柱を格子状に係留した場合に発生する乱流について

抄録

Standard ‘static’ square grid is incapable of producing intense turbulence, while active grid produces large deviation in isotropy. In this study, we have developed a method to generate the relatively strong and near-isotropic turbulence 'passively' by tethering a small cylinder in a grid arrangement. Turbulence is found to be enhanced by vortex-induced oscillation due to the small cylinders. Effect of solidity, which is an area ratio of turbulence generator to the test section, on enhancement of turbulence is examined and it is found that larger solidity enhances turbulence more by replacing standard grid for cylinder-tethered grid.