Drag coefficient and upstream influence in threedimensional stratified flow of finite depth
Abstract
A numerical study of the threedimensional stratified flow past a vertical square flat plate in a channel of finite depth is described. Particular attention is paid to the anomalous dependence of the drag coefficient C_{D} on parameter K( = ND/π U), where N is the BruntVäisälä frequency, D is the half depth of the channel and U is the upstream velocity. It is shown that C_{D} generally increases with K, while it decreases locally at integral values of K. Time development of the upstream columnar disturbance and the corresponding variation of C_{D} reveals that the periodic variation of C_{D} with time for K > 1 comes from the successive upstream radiation of the columnar disturbances of the first internal wave mode. Although the propagation speed of the columnar disturbance is consistent with the prediction of linear theory, its timedependent structure is different from the weakly nonlinear theory as has been shown by laboratory experiments.
 Publication:

Fluid Dynamics Research
 Pub Date:
 February 1989
 DOI:
 10.1016/01695983(89)900026
 Bibcode:
 1989FlDyR...4..317H
 Keywords:

 Drag Coefficients;
 Stratified Flow;
 Three Dimensional Flow;
 Upstream;
 Channel Flow;
 Computational Fluid Dynamics;
 Flat Plates;
 Flow Distribution;
 Flow Velocity;
 Stream Functions (Fluids);
 Fluid Mechanics and Heat Transfer