Calculation of oscillating turbulent flows in open channels
Abstract
An alternatingdirection implicit type finite difference method is used to calculate the vertical structure of oscillatory turbulent flows in twodimensional open channels. The free surface elevation is determined by using, for each time step, the LeapFrog method is the first half step and an implicit method at the second half step. The turbulent shear stress is calculated with the kepsilon turbulence model. Turbulent flow in a laboratory estuary model with one end closed is simulated with the numerical model, and the results are compared with the corresponding flume and field measurements. The influence of frequency and roughness is investigated. The results indicate that the time and space variation of the velocity field and the phase log between the surface slope and the horizontal velocity can be predicted satisfactorily in oscillatory turbulent flows.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 March 1984
 Bibcode:
 1984STIN...8520289C
 Keywords:

 Finite Difference Theory;
 Open Channel Flow;
 Oscillating Flow;
 Turbulent Flow;
 Estuaries;
 Flow Distribution;
 Integrators;
 KEpsilon Turbulence Model;
 Shear Stress;
 Vertical Distribution;
 Fluid Mechanics and Heat Transfer