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Fluctuation in Pressure distribution over the airfoil

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Old   July 25, 2023, 12:04
Default Fluctuation in Pressure distribution over the airfoil
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Amit
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Hi,

I am trying to simulate incompressible flow over NACA 2412. At the frond leading and trailing edge, I am getting fluctuation in pressure. I am new to this and could not figure out the reason whether it is mesh of numerical scheme?
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Old   July 26, 2023, 03:27
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bigfoot
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Do the residuals converge to machine precision? That's the first thing to check. If they get stuck at a high residual, then you first have to make it converge.
Is it convergence?
-> Lower CFL, improve mesh, switch to different numerical scheme

Is it the mesh?
-> Refine the mesh, reduce y+, increase nr. of cells overall, increase mesh quality and you will know the impact of mesh refinement and quality improvement

Is it the numerical scheme?
-> Switch to a different numerical scheme: MUSCL on/off, green-gauss or Weighted LEst Squares and you will know the impact of the numerical scheme
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