L03. Wind-wave flume measurements by Donelan (1987)

Donelan (1987) carried out measurements in a wind-wave flume. One of the experiments where incoming waves were generated in the direction of the wind is simulated in a 1-d computation. The spectrum was measured at one location. Tests L03a and L03b are compared with results of an experiment without incoming swell; tests L03c and L03d are compared with results of an experiment with incoming swell. In the latter two tests the quadruplet source term is deactivated for frequencies lower than 0.78 Hz. The tests L03a and L03c show results after the standard accuracy criterion is fulfilled, and L03b and L03d show the results after a considerably larger number of iterations. It appears that in the case with incoming swell the convergence is very slow.

The computations are Compared with measurements in plot plfL03.

4 runs are made:

L03a
no swell; 40 iterations
L03b
no swell; further 30 iterations
L03c
following swell; standard number of iterations
L03d
following swell; further 40 iterations

References:

Donelan, M.A. (1987),
The effect of swell on the growth of wind waves, Johns Hopkins APL Technical Digest, 8, 1, pp. 18-23.

© 2012: Nico Booij