曲がり管への不均一な流入による旋回流の発生について

抄録

The mechanism of three-dimensional rotational flow in a curved duct caused by distorted inflow is investigated numerically. The steady, laminar flow of viscous, incompressible fluid in a 90-deg. curved duct with a square cross section is simulated by the pseudo-compressibility method. A uniform velocity gradient is assumed at the entrance of the computational domain. The formulation of swirling motion is elucidated as follows ; in the curved portion, the secondary flow induced by the centrifugal force develops asymmetrically due to the angular momentum of the inflow ; downstream of the bend, the enhanced vortex dominates the entire cross section. The latter process is evaluated by an increase in the helicity factor.