Simple Procedure for Multifrequency Analysis

c = wave speed f = wave source g = boundary loading h = mesh parameter k = wave number L = global length scale M = number of frequencies of interest N = number of spatial degrees of freedom NT = number of quasi periods T = basic period t = time U = time-dependent wave field u = wave amplitude x = spatial location t = time-step size = number of floating-point operations = wave length ! = angular frequency