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March 16, 2020, 07:16 |
Dynamic Ground Effect Simulations
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#1 |
New Member
James Permain
Join Date: Feb 2020
Posts: 5
Rep Power: 6 |
I am hoping someone can help me with a possible way I may be able to define the position of my ground wall boundary relative to my 2D moving airfoil for which I want to simulate dynamic ground effect.
I am going to be running dynamic simulations for a NACA4412 airfoil under the influence of ground effect. I will be moving my airfoil in two ways during my simulations: 1) A constant pitch angle and constant sink rate approach to the ground 2) A varying pitch angle rotation at a given height above the ground I need to define my airfoil's instantaneous height above the ground as the distance between the ground and its closest point to the ground. For angles above roughly 1 degree this is always the trailing edge, but for lower pitch angles this point of closest approach varies with pitch. I therefore need a way to extract the minimum distance from my airfoil's geometry to the ground wall so that I can match values of lift and pitching moment to given heights. If there was also a way to create a field function that I could plot/export that would be great, and if I could also use the field function as an input into the origin of my background (and thus wall boundary) I would be able to manually define heights for these tricky pitch angles based off the airfoil's geometry. Any ideas on how I can do this are much appreciated! Please ask for any clarification if this post is not clear; it is my first one on this forum! |
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March 19, 2020, 15:17 |
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#2 |
Senior Member
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 25 |
Is this a transient simulation? If so you can easily define a coordinate system at the non-moving component and then evaluate the minimum of position (using a report) on the airfoil boundary. Recording that as a monitor will give you a plot of time vs height.
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March 20, 2020, 10:31 |
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#3 |
Member
Chris
Join Date: Dec 2018
Posts: 37
Rep Power: 7 |
I would also make the ground boundary a symmetry plane so it doesnt grow a boundary layer but does act like the ground.
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March 21, 2020, 09:00 |
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#4 |
New Member
James Permain
Join Date: Feb 2020
Posts: 5
Rep Power: 6 |
Yes these are transient simulations. This is exactly what I was looking for. I have implemented this and it's working just right. Thank you for your help.
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March 21, 2020, 09:02 |
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#5 |
New Member
James Permain
Join Date: Feb 2020
Posts: 5
Rep Power: 6 |
Thank you for your suggestion Chris. I have set the wall boundary to a slip condition under the shear stress condition so this should prevent the formation of a boundary layer anyway.
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Tags |
field function, geometry, ground effect |
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