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Force function gives a negative value.

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Old   November 29, 2017, 03:02
Default Force function gives a negative value.
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Eric Lee
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Hello,

I'd like to ask what is wrong with my CFD result on CFD-Post, since I keep getting negative values when I try to calculate the force applied on the body to obtain the drag force.

I believe I've tried different boundary conditions for several times, and the mesh quality looks okay according to the value of the skewness.

The details are shown in the attached picture.

I would appreciate if anyone advise on this.

Have a great day.

Eric.
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Old   November 29, 2017, 09:52
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The negative sign is showing direction with respect to your coordinate frame.

Force is a vector. It can be positive or negative.

In your case it is 1.13 N in the negative x direction.
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