Diffracted Wave Velocity Diffracted wave velocity is the wave velocity caused by the diffraction of incident waves around a body. The diffracted wave velocity is imported from Wadam or other supported boundary element code. See also Disturbed Wave Field. This diffracted wave model can only be used in a fixed field point. From SIMA 5.2, it also possible to define a Disturbed Wave Field, which allows diffracted wave kinematics to be applied in points moving inside a defined box-shaped region around a diffractor body. The new functinality should be preferred for most use cases. Diffracted Wave Elevation Lift and drag force