text: ..mmmm.... NOT really correct!!! you know! Energy of water does not depend on the way that water flows, just about loss!\nDischarge of Water in WC is not main reason! in Air plane you can not have enough water flow. It works by pressure.\nAs you know in Bernoulli's Equation we have :\n\nE=z+(p/Gamma)+(v^2/2g)\n\nkinetic Energy just depends on Velocity. Well... let me back to your question...\nin a Hydropower design the main thing is having more energy and less Loss, during generating Electricity. Well... with the main key which I told you, is it really logical that you have a spiral flow?!! in spiral flow you have a lot of loss and also you have some important hit on penstock during swirling flow. If I were you, I designed a really simple and usual penstock. It works better. For comparing of them, you can calculate the value of loss in both alternative and then compare them.\nAnd about simulation model. let me leave you a piece of advice... mmm... Do not use model in this area!! try to see a physical model or built one of them (if your project is really important) because of this reason I told you that use a simple pattern for penstock.\n\nBe Success!!!