as we know, there are some perturbations on a falling jet which are always present and according to their wave number and the radius of the jet, they can grow and decay over time. so, imagine a jet which has those sort of long wavelength waves traveling downward on it, we put an obstacle on the path of the jet and then we would see this : 
so, what exactly happens to those waves by the presence of an obstacle?
why have those waves been too larger in amplitude and too short in wavelength in presence of an obstacle?
This photo has taked by sayyedali.m.( Qom)in Shahid qodosi high school
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