TITLE : Water currents in a river course

BY : Dr S V Zhubrin, CHAM Ltd

DATE : November, 2000

FOR : Demonstration case for PHOENICS 3.3.1

INTRODUCTION

VRGEOM shapemaker utility has been used here to create the geometry object representing the topography of a river course by converting BFC grid XYZ file.

The case presented makes use of the river geometry object to similate the water flow distribution on Cartesian grid.

THE STATEMENT OF THE PROBLEM

This case deals with the 3D turbulent water flow in the river course containing two islands and having nonlinear bed topography. The free surface elevations are neglected assumed to be small for essentially subcritical flow.

COMPUTATIONAL DETAILS

Conservation equations

The independent variables of the problem are the three components of Cartesian coordinate system, namely X, Y and Z.

The main dependent (solved for) variables are:

• Pressure, P1 and
• Three velocity components, U1, V1, W1 and
• Distance from the nearest wall, LTLS, for LVEL turbulence model

THE RESULTS

The plots show the flow distributions in the river course.

Pictures are as follows :

• River geometry on BFC grid
• River geometry and streamlines on Cartesian grid
• Velocity vectors near the open surface
• Velocity contours in the cross sections

THE IMPLEMENTATION

All model settings have been made in VR-Editor of PHOENICS 3.3.1

The relevant Q1 file can be inspected by clicking here.

The clipart for river geometry to be copied into \PHOENICS\D_SATELL\D_VRGEOM can be found here and original XYZ grid file, here.

svz