Numerical Simulation of Flow in Right Angle Branch : Mechanism of Periodical Flow Oscillation in Side Branch

Abstract

This report deals with a numerical analysis on the stability of a flow in a right angle side branch. Spatial growth of velocity perturbation at the upstream boundary of the side branch is examined for various frequencies. The computational result revealed that frequency range of the maximum amplification coincides with that of the fluctuation observed in experiment. Distribution of the wall shear stress fluctuation due to instability shows the local extremum in both the proximal and the distal wall.