I need to choose a topic for a class project involving fluids and/or thermodynamics. It will essentially be a feasibility study on some proposed improvement to an engineering system (of my choosing). For instance, it could be an improvement to a power plant component that increases combustion efficiency by so-and-so and reduces the carbon footprint by x amount. I'm kind of interested in sticking more to the fluid dynamics side of things than the thermo side, but I'm not limited to one or the other. Some vague ideas that I've had so far have included: - missile design or submarine design (maybe something that reduces missile plume? or the turbine efficiency?) - water pumping systems for residential areas ... and that's about it. Can you help me by listing some ideas that fit the bill?