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Drag and Lift Monitors for Oscillating Hydrofoil in a Dynamic Mesh |
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May 15, 2019, 02:57 |
Drag and Lift Monitors for Oscillating Hydrofoil in a Dynamic Mesh
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#1 |
New Member
Erwin Phillippe T. Beronio
Join Date: May 2019
Location: Philippines
Posts: 2
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I am simulating an oscillating hydrofoil initially rotated 30 degrees clockwise, with its initial oscillation motion going upwards. I need to monitor the lift and drag coefficients throughout the whole cycle, but since the default options only enable a single value for the force vectors (X and Y) in each monitor I am only correctly monitoring lift and drag for one angle. How would I properly monitor the lift and drag coefficients with the angle of attack changing per timestep?
Upon researching, I have read that the monitors in the GUI cannot keep up with the changing angle of attack during the transient simulation. Is there a way to resolve this limitation? |
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May 16, 2019, 02:29 |
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#2 |
New Member
New South Wales
Join Date: Feb 2016
Posts: 9
Rep Power: 10 |
By the look of your mesh, you are inclining your aerofoil to a given AoA and keeping your velocity vector constant (along the x axis)? From this position you are oscillating in pitch?
If this is the case, remember that the lift acts perpendicular to the velocity and drag acts parallel. This means that during your oscillations if you have a lift monitor measuring wall forces in the y direction and drag monitor in the x direction then they will always be measuring lift and drag (velocity vector not changing). If you want to have the normal and axial forces, this requires some simple post processing using the relations found on this page: http://www.aerospaceweb.org/question...cs/q0194.shtml Have fluent write the timestep data to a file so you can easily post process. You can figure out your AoA from your pitch rate and the time history. |
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May 16, 2019, 11:28 |
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#3 | |
New Member
Erwin Phillippe T. Beronio
Join Date: May 2019
Location: Philippines
Posts: 2
Rep Power: 0 |
Quote:
When I did the steady-state runs in order to generate the lift and drag curves for an airfoil steady at 0deg AoA, I remember that it was the velocity vectors and the monitors that I changed for each AoA since the monitors gave incorrect values when its vectors were unchanged. I'll take a look at how the lift and drag curves would be generated given the theory you stated. What are the steps involved in the post processing? My adviser told me it involved generating an iso-surface and obtaining values from there. |
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Tags |
drag monitor, dynamic mesh, lift monitor, oscillating hydrofoil |
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