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How to convert a coordinate system into a position vector? |
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July 31, 2020, 07:09 |
How to convert a coordinate system into a position vector?
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#1 |
New Member
A. Mier
Join Date: Jun 2020
Posts: 3
Rep Power: 6 |
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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July 31, 2020, 09:59 |
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#2 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
Rep Power: 20 |
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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July 31, 2020, 10:25 |
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#3 |
Senior Member
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 437
Rep Power: 18 |
Also - in case of necessity you can set your own coordinate system.
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July 31, 2020, 11:41 |
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#4 |
New Member
A. Mier
Join Date: Jun 2020
Posts: 3
Rep Power: 6 |
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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August 1, 2020, 00:29 |
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#5 |
Senior Member
Ping
Join Date: Mar 2009
Posts: 556
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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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coordinate system, moment, position vector |
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