[mrkmrk]

Hi,

There is a pipe with a sliding valve in the middle. Pressure inlet and outlet profiles are applied to the inlet and outlet of the pipe. The pipe's walls are deformable. Flow is modeled using FSI simulation.

From t=0 - 10 s, the valve is fully closed. The problem is that in this time interval, the flow velocity in the left part of the pipe increases to 0.7 m/s, while since there is no outlet for the left portion of the pipe, the velocity in this part should be near zero.

It should be mentioned that to avoid splitting the computational domain, a small gap is left between the valve and the lower wall. Flow cannot pass through this gap because it is modeled using Fluent's Gap model, and it is defined that when the gap gets closer than a predefined value to the lower wall, it shouldn't let flow pass.

I would appreciate any help you can provide.

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