You need to find out whether the dynamo produces a smooth waveform or a 'choppy' one.
In fact, regardless of the waveform, in any case it is a good idea to put a smoothing capacitor at the input of the converter.
Simulations can be an excellent learning tool. A bit of experimenting will quickly reveal the inner workings of the different converters.
See my posts in the thread below. You'll find links to my tutorial simulations of switched-coil converters.
https://www.edaboard.com/threads/268178/