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Use absolute coordinate system when using "translate" on a body? |
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October 24, 2019, 20:03 |
Use absolute coordinate system when using "translate" on a body?
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#1 |
New Member
Robert Sciambra
Join Date: Oct 2019
Posts: 1
Rep Power: 0 |
Hello!
I am new to Star-CCM+ and am having some issues. I am running 2D simulations of race car airfoils in ground effect. I am trying to create a macro that will run an angle of attack sweep for the airfoil while keeping the lowest point of the airfoil at exactly 2 inches above the ground. I recognize that this is an important distinction because I have seen other threads that want to perform the same task without ground effect could simply adjust the angle of the incoming flow rather than the airfoil itself. I have been doing this manually by finding the minimum height value of the airfoil, translating it down by that amount, then translating it up 2 inches and re-meshing. I recorded a macro that adjusts the angle and re-meshes just fine, but I can't find a way to make the macro translate the airfoil down by a variable distance, namely the lowest point of the airfoil from the ground, before moving it back up two inches. It would be super simple if I could move the body to a specific point using absolute coordinates, but I don't see a way of doing so. If anybody has any insight (or a different way of approaching this), please let me know! Thanks in advance. Last edited by sciamwow; October 24, 2019 at 20:05. Reason: Added information. |
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October 25, 2019, 06:13 |
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#2 |
Senior Member
Chaotic Water
Join Date: Jul 2012
Location: Elgrin Fau
Posts: 438
Rep Power: 18 |
Well, it can be done like this:
- set the Minimum Report for $$Position[2] (z-coordinate) at Airfoil surfaces; - move/rotate/etc the airfoil; - mesh incorrectly positioned airfoil, this will allow to get the required translation via Minimum Report; - translate according to Minimum Report and 2 inches. Not the best way, but at least it should work. |
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aoa, ground effect, star-ccm+, sweep |
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