|February 5, 2014, 14:00||
Couple different additional variables
Join Date: Nov 2011
Posts: 40Rep Power: 7
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?
|February 5, 2014, 15:37||
Join Date: Jun 2009
Posts: 593Rep Power: 13
I assume you got the heat flux vector by doing something similar to
ADDITIONAL VARIABLE: MyHeatFluxVector
Option = Vector Algebraic Equation
Vector xValue = - Thermal Conductivity * Temperature.Gradient X
Vector yValue = - Thermal Conductivity * Temperature.Gradient Y
Vector zValue = - Thermal Conductivity * Temperature.Gradient Z
Now you should be able to access the MyHeatFluxVector_x.Gradient X, and any of its components.
NOTICE the syntax to access the components of a vector AV. That is the syntax for AV vector components in the ANSYS CFX Solver. Unfortunately, in CFD-Post you will see MyHeatFluxVector X(Y/Z) instead.
Not sure what you are trying to do with these variables, but if you need them for post-processing only you should be able to do the same in CFD-Post and save you to rerun the case. Create a User Defined variable, and select Vector + Gradient.
Hope the above helps,
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