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 February 5, 2014, 14:00 Couple different additional variables #1 Member   Join Date: Nov 2011 Location: Germany Posts: 40 Rep Power: 8 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!

 February 5, 2014, 15:37 #2 Senior Member   Join Date: Jun 2009 Posts: 727 Rep Power: 15 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 END 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, TrII4d likes this.

 February 6, 2014, 03:28 #3 Member   Join Date: Nov 2011 Location: Germany Posts: 40 Rep Power: 8 hi Opaque, thank you very very much ... this is exactly what i was searching for ... i read the syntax for a vector AV in the user guide ... but it was not really clear for me ... but now i got it ...

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