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March 30, 2018, 09:29 |
Naca0012 OpenFoam Simulations
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#1 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 373
Rep Power: 12 |
Greetings
I am currently carrying out some simulations of a naca0012 profile at different angles of attack, as preliminary stuff for my semester project. I am creating the naca profile using a matlab script and the usual naca equation, then the mesh with Salome. I cannot manage to capture the correct lift coefficent for the airfoil: for low angles of attack i would expect it to match closely the theorical values provided by Thin Airfoil Theory, as it happens other simulations/experimental tests (Nasa measurements, Wind Tunnel test ecc) Turns out that my simulations underestimate the lift coefficent of about 30-40% percent. Say, for example, at 6 AOA, i get about 0.4 with respect to the theorical 0.65. Due to the small chord (about 0.3 m )of the airfoil we want to use in the wind tunnel with my professor, the simulation type that i am running is laminar. I am attaching controlDicts, initial conditions ecc ecc (the mesh z direction is 0.03) I initially used simpleFoam solver, but since residuals didn't get too low on Uy,P i switched to pisoFoam (lately, i've been also initializing it using a potential Flow solution) I tried with different meshes (all structured, but with different refinements ecc) with no avail. In all cases, the trailing edge was sharp. From what i can see visualizing the solution, seems like OpenFoam overpredicts Boundary Layer separation, as i already have large bubbles at the already mentioned 6 AOA, which i guess it shouldn't happen. This seems consistent with the underpredicted lift coefficent with respect to the correct one. I was wondering wether one of you might spot a stupid mistake i made and/or provide tips/suggestions to solve the issue Thank you very much! |
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June 3, 2018, 04:02 |
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#2 |
Member
Sangeet
Join Date: Jun 2017
Location: India
Posts: 43
Rep Power: 8 |
Hello.
Do you still need help? |
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August 24, 2018, 10:18 |
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#3 |
Member
Arthur
Join Date: Aug 2014
Location: Italy
Posts: 47
Rep Power: 11 |
Did you solve your case?
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September 12, 2018, 00:00 |
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#4 |
New Member
Gokul Ravi
Join Date: Apr 2018
Posts: 5
Rep Power: 8 |
Do you still need the help to solving it?
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