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May 19, 2021, 11:12 |
Validation NACA 2412
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#1 |
New Member
Danijel
Join Date: May 2021
Posts: 5
Rep Power: 5 |
Hi guys,
I'm doing a validation of the NACA 2412 profile at Re=2200000. I used a C-grid with 20 chords in the front and 50 on the back. I did a first structured mesh with 60000 and 180000 knots using an adapted bias in order to have y_plus<1. However, the results regarding Cl and Cd are so different when using K-q SST and SST transitional. 60000 nodes K-W: Cl=0.21314 and Cd=0.009669 60000 nodes SST transitional: Cl=0.23374 and Cd=0.0047277 180000 nodes K-w: Cl=0.21335 and Cd=0.0096094 180000 nodes SST transitional: Cl=0.23549 and Cd=0.0046394 The results of K-w SST are much more similar to the experimental ones. Could there be any problem regarding the mesh, geometry or the boundary condition? |
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May 19, 2021, 16:03 |
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#2 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 374
Rep Power: 12 |
Which are the experimental results? Also at Re= 2 millions I see no reason to consider laminar to turbulent transition
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May 20, 2021, 04:08 |
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#3 |
New Member
Danijel
Join Date: May 2021
Posts: 5
Rep Power: 5 |
Thanks, I used tecnhical report of NASA. Considering that i do not have the turbolence for low attack angles, can I use SST transitional above 12 degres where i know the turbolence is going to start?
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May 23, 2021, 04:06 |
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#4 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 374
Rep Power: 12 |
You seem to have some confusion between turbulence and flow separation
At Re 2million your flow is going to be always turbulent, but will not always separate |
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May 27, 2021, 04:11 |
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#5 |
New Member
Danijel
Join Date: May 2021
Posts: 5
Rep Power: 5 |
Thanks, i understand
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Tags |
fluent naca validation |
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