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Field Function shows an error

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Old   September 23, 2011, 02:42
Default Field Function shows an error
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Niaz Ali Ahmed
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I am trying to write a vector field function to calculate 17/(Velocity^2)

I have tried

17/(pow($$Velocity,2))
17/($$Velocity*$$Velocity)

Both have failed. Is this because vector division is not possible, or some other error?

However when I use a single dollar Velocity it shows assembly code.

Please help me asap.
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Old   September 23, 2011, 04:12
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Jean-François Corbett
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There is no such thing as vector division.

I'm guessing you want to divide by the magnitude of the velocity vector? STAR-CCM+ provides two ways to calculate the magnitude of a vector:

vector magnitude: mag($$u)
vector magnitude squared: mag2($$u)

So for you, the most straightforward expression is: 17/mag2($$Velocity)

For more, see STAR-CCM+ help:
Using Tools > Using Field Functions > Field Function Programming Reference > Vector Functions
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Old   September 23, 2011, 08:17
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Niaz Ali Ahmed
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@jfcorbett
Thank you very much. The problem is solved now.
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