A Dry-Wet Boundary Condition and a Discharge Error,when the CRD Schemes Is Applied to a Steep Gradient River

Abstract

Contour-integration-based residual distribution, CRD scheme is one of numerical computational methods to simulate flows with shock waves. Authors have applied the CRD scheme to the open channel flow, and shown validity as compared with the experiment-with-a-model result or the theoretical value. However, for applying to various flows, the boundary condition of dry-wet is required.In the paper, when the CRD scheme is applied to a steep gradient river, the boundary condition of dry-wet is shown paying attention to a discharge error. And the shock capturing method of two dimensional calculation for raising applicability the CRD scheme is shown.