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How to convert a coordinate system into a position vector?

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Old   July 31, 2020, 08:09
Default How to convert a coordinate system into a position vector?
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I want to use this coordinate system's origin as the center of an object and then compute moments occurring on the faces of this object relative to the origin.

For this I thought of multiplying the force vectors by the position vector resulting from this coordinate system. Is it possible to do this in Star CCM+?
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Old   July 31, 2020, 10:59
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it is much simpler than that since you have the moment report built in which has properties to allow you to set the csys and the part(s) to measure on
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Old   July 31, 2020, 11:25
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Also - in case of necessity you can set your own coordinate system.
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Old   July 31, 2020, 12:41
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I have tried the built-in reports but they give wrong results in comparison to the Literature. I am dealing with an open channel flow where I am trying to compute the moments due to the hydrodynamic forces of the water.

From my simulations I understand the built-in functions consider both hydrostatic and hydrodynamic forces, and I only require the hydrodynamic component. So I created a vector field function for the hydrodynamic force as explained on a different post in this forum.

However, when it comes to the moment I am unable to get the right approach, so I thought that by multiplying this vector force by the position vector would give me the moments about the center of the object.
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Old   August 1, 2020, 01:29
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well unless you are using the moment report incorrectly i suspect your model has a problem since i've never had a moment report lie.
but it is not hard to create your own moment report using the force vector field and the radial component of a local cylindrical csys you create at your required axis.
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