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USER_GETVAR, Time Derivate operation on vector

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Old   August 2, 2007, 06:19
Default USER_GETVAR, Time Derivate operation on vector
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Hello, I'm trying to extract the kinetic energy from my CFD domain during transient simulation using a USER FORTRAN routine. I want to create a new variable "time derivative of the velocity vector" with the function USER_GETVAR. ".Time Derivate" operator seems to work on scalar but not on vector. Is there anybody who encountered the same problem and found out a solution? Thanks
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Old   August 2, 2007, 09:04
Default Re: USER_GETVAR, Time Derivate operation on vector
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Dear Nicolas,

What kind of error you get when calling USER_GETVAR with

MyFluidPhase.Velocity.Time Derivative ?

Then, we can try to help you.


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Old   August 3, 2007, 05:49
Default Re: USER_GETVAR, Time Derivate operation on vector
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Thanks for your help, I understood my mistake! I used the formula MyFluidPhase.Velocity.Time Derivate instead of MyFluidPhase.Velocity.Time Derivative. The confusion comes from the help file of CFX 11...
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Old   June 18, 2010, 06:25
Default Searching for the Time Derivative file
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María del Mar RF
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Has anyone found the Time Derivative expression?

I don´t find it and support help told me it doesn´t exist.

I really don´t know how to calculate the acceleration of fluid as the derivative of the Water.Velocity expression ?¿?¿

Any ideas?

Kind regards.
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Old   June 18, 2010, 06:37
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Glenn Horrocks
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It does not exist. The previous posts in this thread are news to me - I don't think they work - but I would love to be shown to be wrong!
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