[TrII4d]

hey guys,

is there a way to couple two or more additional variables (AV) with each other?
what i want to do is the following:

i calculated heat flux for all three directions (see http://www.cfd-online.com/Forums/cfx...direction.html) with an additional tensor type "vector" ... so i finally got q_x, q_y and q_z ...

now i want to calculate the gradient X of q_x like this :



but im not able to write an algebraic equation for this case ... the problem is to handle the two gradients ... this is my actual status :

(- Thermal Conductivity * Temperature.Gradient X).Gradient X

but this is not working ...

another idea is that i calculate in an AV tensor type "vector" (name GradQ) and use this AV later, i.e.

GradQ X.Gradient X

but this is not working, too ...

any good ideas?

-thanks!