Kill particles based on their velocity

Hi all !
I am new to unreal 4 and I want to use it for data science visualisation. I have no specific knowledge of C++, but I know matlab, python and VEX (houdini)
So, I have a specific vector field that I use to advect particles, but I would like to kill particles having very small velocities, is there a way to do that ?
I’ve tried to decrease the size of particles based on their velocities using “size by speed” but I didn’t make it work.
Someone have an idea ?

So I managed to make work the module “size by speed” (see attachment) but still looking for a killing solution :slight_smile: