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

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Old   June 20, 2012, 02:18
Default tilting of a tank in two directions(multiple load steps)
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sudhakar
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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.
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Old   June 20, 2012, 16:33
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Edmund Singer P.E.
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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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Old   June 21, 2012, 05:05
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sudhakar
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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 View Post
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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