Calculating the ripple voltage from a standard wall adapter power supply
This formula works OK as an estimate using the Vdc min and f = 2x input with a  resistive load, but not with a reactive load.

Consider that if the load were pure C then there would be zero ripple ( +ve peak detector) and replacing R with L increases the ripple.

However the shape of the ripple does not "overshoot" the peak as shown but rather is a fairly straight as the Cap decays towards T=RC