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April 23, 2019, 13:07
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Flow not separating at high angles of attack
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#1 |
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New Member
Edward Ritchie
Join Date: Apr 2019
Posts: 1
Rep Power: 0  |
Hi,
The flow is not separating with this aggressive angle of attack and I'm pretty sure it should. Has anyone got any ideas? Thanks in advance, Ed. 3-element wing.jpg 3D model of 3-element wing (formula student rear wing, without endplates) in freestream. Aerofoils are all 'FX 74-Cl5-140 MOD'. Front element is 600mm chord, 27 degrees AOA. Middle element is 150mm chord, 38 degrees AOA. Rear element is 150mm chord, 52 degrees AOA. Span is 900mm. Freestream velocity=15m/s. Tested in Spalart-Allmaras and K-W SST and I get the same result … 220 N of downforce. Mesh1.jpg Mesh2.jpg Inflation set to 10 layers, 1.2 growth rate, and 6.2 x10^-5 first layer thickness. No stair-stepping of inflation layers. Average Y+ is just below 2. YPlus average.jpg |
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May 8, 2019, 17:02
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#2 |
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New Member
Join Date: Mar 2015
Posts: 28
Rep Power: 11 |
you have a poor mesh,use overset or structured mesh.
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| aerofoils, fluent, separation |
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