USER_GETVAR, Time Derivate operation on vector
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

Re: USER_GETVAR, Time Derivate operation on vector
Dear Nicolas,
What kind of error you get when calling USER_GETVAR with MyFluidPhase.Velocity.Time Derivative ? Then, we can try to help you. Opaque 
Re: USER_GETVAR, Time Derivate operation on vector
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...

Searching for the Time Derivative file
Hello,
Has anyone found the Time Derivative expression? I donīt find it and support help told me it doesnīt exist. I really donīt know how to calculate the acceleration of fluid as the derivative of the Water.Velocity expression ?ŋ?ŋ Any ideas? Kind regards. 
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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