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Simulating an oscillating wall: uniformFixedValue or movingWallVelocity

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Old   January 14, 2017, 13:07
Default Simulating an oscillating wall: uniformFixedValue or movingWallVelocity
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Pete Bachant
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I am trying to simulate an oscillating wall boundary condition without a moving mesh, so I'm currently using uniformFixedValue BC with a sine and zero offset. However, computing force on the wall is giving a strange result: it never drops below the value it had at t=0, even though the velocity becomes negative. Should I be using a movingWallVelocity BC? Is it even possible to define a moving wall with a sine oscillation?

Note that in my case, it's mostly a normal velocity, like a piston, rather than a shearing flat plate type case.
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Old   November 11, 2020, 06:07
Default BC uniformFixedValue for oscilating
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hello i am looking for BC for uniformFixedValue for an oscillating wall as you specified.

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