[eRzBeNgEl]

Hi guys,

I have got a little problem. I want to set up a field function where velocity gradients are included:

e.g:

du/dx -> CCM Code: grad($$Velocity[0]). I think this is for du/dx right, where u is the first component of the velocity vector.

How does this work for du/dy or du/dz??

Thanks for help

[f-w]

Check out the help file:

Using Tools > Using Field Functions > Field Function Programming Reference > Vector Functions, Miscellaneous Functions

[kyle]

"grad($$Velocity[0])" will get you a vector field function consisting of (du/dx, du/dy, du/dz). If you just want du/dx, then you need to do "grad($$Velocity[0])[0]"

To be clear...

du/dx = grad($$Velocity[0])[0]
du/dy = grad($$Velocity[0])[1]
dv/dx = grad($$Velocity[1])[0]
dv/dy = grad($$Velocity[1])[1]
dw/dx = grad($$Velocity[2])[0]
etc...

[eRzBeNgEl]

Ah Kyle, thank u! :-) This is it what I was looking for....