[zxzx]

Hello, everyone

I have tried to ask some questions about how to realize the swirl flow in inlet. But until now I still can not get the proper answer. So I plan to create a physical model to help to realize the swirl flow in inlet. As you can see in the picture, I set four pipes in the top of the cylinder. But when I ran it, the flow through small pipe enters into cylinder and become straight line no matter how much the speed of flow. I am very confused for it. Could anyone here help me? Is there anything wrong in my setting. Thank you very much.