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#1 |
New Member
Daniel Dotson
Join Date: May 2020
Posts: 13
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Hello,
I am running a transient Karman-Trefftz airfoil case with icoFoam. Re: 10000 α: 5° Grid Topology: O Number of Cells: ~1000000 (almost entirely perfect squares) Δt: 0.0004 Domain Radius: 20c Wall BC: zeroGradient Pressure, noSlip Velocity Farfiled BC: fixedValue Pressure, fixedValue Velocity I know this isn't the ideal setup for this problem but I am just trying to experiment. The max Courant number starts off a bit high for a few steps near the LE and TE where the cells are smallest, but it quickly settles into about 0.8 as the boundary layer grows. On the downstream boundary, a wavy artifact in the velocity field starts off barely visible and then gradually grows until the solution blows up. t=0.4s t04.png t=6.0s t6.png t=7.6s t76.png Is there something wrong with my boundary conditions? |
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#2 |
New Member
Daniel Dotson
Join Date: May 2020
Posts: 13
Rep Power: 4 ![]() |
Solved
I managed to stabilize it by changing the farfield boundary conditions to freestreamVelocity and freestreamPressure. |
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Tags |
airfoil, blowup, boundary conditions, external, farfield |
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