抄録
The applicability of the computational method for multiphase flows, MICS (Multiphase Incompressible flow solver with Collocated grid System), is investigated for the incipient motion of a cylinder under the shielding effects in a duct flow. In order to understand the actual phenomena, hydraulic experiments are conducted with two cylinders, one fixed and another movable. In the experiments, the distance of the two cylinders are widely changed and critical flow rates that rotate the movable cylinder are measured. As a result, resistance force and sheltering coefficients are derived and the defects of the usual evaluation method to derive these values are pointed out. The incipient motion of the cylinder is numerically investigated with MICS. As a result of the computations, it is shown that the behaviors of the movable cylinder are reasonably predicted with MICS, while MICS needs no empirical coefficients regarding the resistance force and sheltering effects.
