Simulating an oscillating wall: uniformFixedValue or movingWallVelocity

pbachant · January 14, 2017, 13:07

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.

RMC1 · November 11, 2020, 06:07

hello i am looking for BC for uniformFixedValue for an oscillating wall as you specified.

please reply.

January 14, 2017, 13:07	Simulating an oscillating wall: uniformFixedValue or movingWallVelocity	#1
pbachant Senior Member Pete Bachant Join Date: Jun 2012 Location: Boston, MA Posts: 173 Rep Power: 14	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. __________________ Home \| Twitter \| GitHub

November 11, 2020, 06:07	BC uniformFixedValue for oscilating	#2
RMC1 New Member Rmc Join Date: Nov 2020 Posts: 3 Rep Power: 6	hello i am looking for BC for uniformFixedValue for an oscillating wall as you specified. please reply.

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