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Thomas March 27, 2005 13:16
Second derivative
 
Hi cfx users,

Still don't manage to calculate d2u/dx2, which is equal to Velocity u.Gradient x.Gradient x Someone to help me?? Thanks,

Thomas

liumalin March 28, 2005 12:02
Re: Second derivative
 
can you explain you problem more detailed? calculate d2u/dx2 in the CFX-UDF? or in other place?

Thomas March 28, 2005 13:38
Re: Second derivative
 
Hey. I would like to calculate it with a Fortran routine and the command user_getvar. With that I'm able to obtain the gradient: so just velocity u.gradient.gradient (and not velocity u.gradient x.gradient x!!)... as I cannot use the variable created in cfx-post: velocity u.gradient x. Do you have any suggestion to calculate d2u/dx2?? It doesn't matter how. Thanks


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