I don’t think flex is the proper solution because it means you’ll have to use a flex editor that is incompatible with lot’s of plugins. I’ve been using it with a 1080gtx and it has lot’s of crashes. Since it has such a great potential and is probably an essential tool to make fluids I hope UE4 and NVIDIA developers cooperate to make the plugin integrated in the engine in the future. meanwhile I would try to use Houdini to do what you require