# tilting of a tank in two directions(multiple load steps)

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 June 20, 2012, 02:18 tilting of a tank in two directions(multiple load steps) #1 New Member   sudhakar Join Date: Jun 2012 Posts: 2 Rep Power: 0 hi all , I m trying to tilt a simple fluid tank in an axis say x-axis for 2s and after that from 2s to 4s in z-axis , i m able to do the first step properly but could not able to do both the second load step. is it possible to complete both load step in a single run? right now i m picking intial value of first run(0 to 2s)for the second run(2 to 4s) but it doesnt work properly. please help.

 June 20, 2012, 16:33 #2 Senior Member   Edmund Singer P.E. Join Date: Aug 2010 Location: Minneapolis, MN Posts: 512 Rep Power: 14 I assume you are doing this with mesh deformation? Couple of ways of doing this. First way: If you are using a version of CFX that allows case configurations, just do your normal simulation from 0-2seconds with the original mesh, for the first configuration. You will need to generate a new mesh that has the x axis rotation already built in. Then just do your z axis rotation from 2 to 4 seconds as the second configuration. Second way: If you want to do this all with the same mesh, you will have be tricky with the rotation logic. If you are familiar with rotation matrices just set one up for a x rotation by angle theta, followed by a z rotation of angle phi and use the resulting x,y,z equations for your movement. The rotation angles will be a function of time with theta changing during 0 to 2 seconds and remaining constant after that and phi will be zero from 0 to 2 seconds and vary after that.

June 21, 2012, 05:05
little confusion
#3
New Member

sudhakar
Join Date: Jun 2012
Posts: 2
Rep Power: 0
hi edmund,

when the first configuration is over the water is filled half the tank in a inclined manner, how will generate a mesh of free surface of the fluid in the second configuration, please need some help

Quote:
 Originally Posted by singer1812 I assume you are doing this with mesh deformation? Couple of ways of doing this. First way: If you are using a version of CFX that allows case configurations, just do your normal simulation from 0-2seconds with the original mesh, for the first configuration. You will need to generate a new mesh that has the x axis rotation already built in. Then just do your z axis rotation from 2 to 4 seconds as the second configuration. Second way: If you want to do this all with the same mesh, you will have be tricky with the rotation logic. If you are familiar with rotation matrices just set one up for a x rotation by angle theta, followed by a z rotation of angle phi and use the resulting x,y,z equations for your movement. The rotation angles will be a function of time with theta changing during 0 to 2 seconds and remaining constant after that and phi will be zero from 0 to 2 seconds and vary after that.

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