40 180°曲り円管内乱流の数値解析

抄録

A numerical analysis has been performed for developing turbulent flow in a 180°-bend tube with straight inlet and outlet sections by three turbulent models. The calculated results of these models are compared with the experimental data available. These predicted results are in a good agreement with the experimental data of time averaged velocity and fluctuating velocity. As a striking feature of the flow, it has been pointed out in the experiment of 180°-bend tube that the cross-stream flow undergoes a second reversal in its sense of motion and is redirected toward the pipe inner radius. Each of three turbulent models is able to predict this occurence of the cross-stream flow reversal in the bend. Judging from the comparison the calculated results with tile experimented data, the great discrepancies among near-wall turbulent models are not confirmed.