|May 22, 2013, 08:02||
Average value of expression in transient flow analysis
Jacob Fogh Knudsen
Join Date: May 2013
Location: Aarhus, Denmark
Posts: 1Rep Power: 0
I am currently trying to set up a transient flow analysis of an aerofoil. I want to extract the average drag coefficient as a parameter for a study, but have run into some problems.
Currently i am so far:
When I run the model I get an instant error saying:
| PROBLEM ENCOUNTERED WHEN EXECUTING CFX EXPRESSION LANGUAGE |
| The CFX expression language was evaluating: |
| Additional Variable Value |
| The problem was: |
| DIVIDE-BY-ZERO |
Have I missed some small detail or am I doing it completely wrong?
Please help. Thanks!
|May 22, 2013, 08:52||
Join Date: Mar 2009
Posts: 533Rep Power: 11
I've done almost the same thing as you, but used two AVs and the .Trnavg operator instead. It worked for me.
edit: what was the initial condition for your AV? If it was set to zero it could explain your error.
LIBRARY: ADDITIONAL VARIABLE: Additional Variable 1 Boundary Only Field = On Option = Definition Tensor Type = SCALAR Units = [Pa] Variable Type = Unspecified END ADDITIONAL VARIABLE: Additional Variable 2 Boundary Only Field = On Option = Definition Tensor Type = SCALAR Units = [Pa] Variable Type = Unspecified END and FLUID MODELS: ADDITIONAL VARIABLE: Additional Variable 1 Additional Variable Value = areaAve(Pressure)@boundary <--- your expression Option = Algebraic Equation END ADDITIONAL VARIABLE: Additional Variable 2 Additional Variable Value = Additional Variable 1.Trnavg <--- time average Option = Algebraic Equation END
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