無巻水路トンネル内の流れの抵抗則について

Abstract

This paper deals with the resistance law of flows in the headrace tunnel without concrete lining.The fundamental experiments have performed simulating the flows by using the triangular roughness element.The equation, which is compatible with the experimental results, is also derived theoretically.It is pointed out in view of the comparison between experimental results and observed ones that these results are applicable for the flows in the headrace tunnel without concrete lining.The numerical simulation model for the flow over a triangular roughnesselement is also developed by means of the refined k-ε model. The numerical procedures are firstly described with the boundary conditions at the wall and the free surface.The calculated results are discussed with the experimental ones indicating the necessity of further investigations concerning the refinement of numerical model.