edw(1) --- Imcat Users Guide --- section: imcattools_waves --- last changed: Thu Jul 10 HST
edw - evolve dispersive wavesSYNOPSIS
edw dt [-ocean | -debroglie | -scalar kstar] [-verbose][-novideo]DESCRIPTION
Edw reads a 3D FITS image f[2][Ny][Nx] from standard input, the two planes of which are the initial field f = f[0] and the initial velocity fdot = f[1].
It computes the transforms fk of f and fdotk of fdot and forms the positive frequency component: fp(k) = (fk + fdotk / i omega) It then computes and sends to stdout a stream of images containing the real part of the inverse transform of fp(k) * exp(i omega(k) * t). for t = integer multiples of dt. By default, the dispersion relation is omega = k. With option -ocean we use omega = sqrt(k). With the -novideo option we do not output a stream of images, rather we evolve for one step and then output an image f[2][Ny][Nx] containing the final field and velocity. With -verbose option we tell stderr what we are doing. SEE ALSOgenerate_dw(1), evolvescalar(1), xfv(1).
AUTHOR
Nick Kaiser --- kaiser@hawaii.edu