How to solve the problem when the boundary velocity is not 0?

Hello, friends.

I want to simulate an open channel flow,and then because I need to turn on DensityDT = 3, I turn on the gravity setting. I modified the XML file according to "examples\main\15_Poiseuille".In addition, I found that the inlet/oulet option of "examples\inletoutlet\02_OpenChannel" needs to set the initial speed. I tried to set the initial speed of buffer zone = 0, but the fluid began to leak to both sides, so I chose Periodicity.

Finally, in the simulated results, the boundary velocity is not 0.How to solve this problem?

This is my XML file.

Best regards

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