Experimental study on turbulence generated by small-object-tethered gird

Abstract

Standard ‘ static ’ square grid is incapable of producing intense turbulence , while active grid produces large deviation isotropy isotropy . In this study , we investigated a method to generate the relatively strong and near-isotropic turbulence ‘ passively ’ by tethering a small object such as sphere and cylinder with a string. Turbulence is found to be intensified by oscillation of the small objects and there is clear difference in the manner of oscillation.