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CFD Post not calculating gradients

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Old   January 30, 2020, 11:29
Default CFD Post not calculating gradients
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Nithin
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Hi,
I am trying to calculate the gradient of a variable which was defined by an expression. But the value returned is zero across the whole domain.

Here is the expression of the variable:
-6.73979*H2.Mass Fraction-9.76535*H.Mass Fraction-0.84106*O2.Mass Fraction-11.93170*O.Mass Fraction+2.57306*H2o.Mass Fraction-0.40098*Oh.Mass Fraction+0.11357*Ho2.Mass Fraction+24.21178*No.Mass Fraction

Thank You
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Old   January 30, 2020, 14:57
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There are several ways to figure out the problem,

1 - Can you compute the gradient of H2.Mass Fraction?
2 - Does it make sense? i.e. is it what you expect?
3 - Loop over the next term in your original formula and see when it fails.
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Old   January 31, 2020, 03:26
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I don't know why Post can't calculate the gradient. I defined the variable in fluent as a custom field function and then exported the data and used Post to calculate the gradient. This time it worked.
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