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Abs function in OpenFOAM

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Old   October 19, 2021, 12:42
Default Abs function in OpenFOAM
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I am using OpenFOAM 7 to program a custom function object. Somewhere in the code, I needed to compute the absolute value of a scalar.

The code never worked as expected, and I had to spend approximately 2 hours in order to find the bug which turns out to be:

abs doesn't return the absolute value. for example abs(5.222) will always return 5.

* I am wondering why abs function in OpenFOAM behaves like that? what is the purpose? (unless I am missing something, I find it misleading).

* How to compute the absolute value of a scalar in OpenFOAM? (I know I can do: value = (value < 0)? -value: value) but I would like to know if there is a function to do that)

BTW, I needed to use abs from cmath which returns the expected value.

Could you please explain that?

Thank you
d.f

Update:

To compute the absolute value of a scalar in OpenFOAM use mag function, e.g mag(-7.556) will return 7.556.

Last edited by NotOverUnderated; October 19, 2021 at 14:36.
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