wall applied to a random excitation

amirrezagh · October 7, 2011, 16:30

Hello,

I am modelling a water tank subjected to an earthquake load. I was wondering if somebody could help me on how I can enter time-history displacement in CFX model.

To clarify the issue, I have defined an expression called "dWall" which represents the displacement of wall boundary condition. I would appreciate if someone could help me how the time-history load can be read as the value of this expression.

Thank you for your time and consideration,

ghorrocks · October 8, 2011, 04:58

There has been some discussion about this sort of modelling before on the forum - a search of the forum may be useful.

You can do this model either with moving mesh, as you seem to imply; or a simplified model where you just move the gravity vector. Moving the gravity vector is much simpler and quicker, but whether the simplification to a stationary domain is appropriate you will have to determine for your case.

But to answer your question, you can simply define a 1D interpolation function to have the desired displacement versus time function.

October 7, 2011, 16:30	wall boundary subjected to a random excitation	#1
amirrezagh New Member amir Join Date: Jan 2010 Posts: 3 Rep Power: 16	Hello, I am modelling a water tank subjected to an earthquake load. I was wondering if somebody could help me on how I can enter time-history displacement in CFX model. To clarify the issue, I have defined an expression called "dWall" which represents the displacement of wall boundary condition. I would appreciate if someone could help me how the time-history load can be read as the value of this expression. Thank you for your time and consideration, Last edited by amirrezagh; October 7, 2011 at 17:42.

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October 8, 2011, 04:58		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	There has been some discussion about this sort of modelling before on the forum - a search of the forum may be useful. You can do this model either with moving mesh, as you seem to imply; or a simplified model where you just move the gravity vector. Moving the gravity vector is much simpler and quicker, but whether the simplification to a stationary domain is appropriate you will have to determine for your case. But to answer your question, you can simply define a 1D interpolation function to have the desired displacement versus time function.