Residuals increasing after few iterations
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I am simulating 3D slender body at high angle of attack. Re=3 million. y+<1. I tried different meshes from course to fine but the problem remains. I am attaching residual picture. Any help is highly appreciated. I am stuck at it for a long time.
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Use coupled algorithm and make the Courant number as 0.5
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I am using coupled scheme, i tried range of courant number from 5 to 200. But following your suggestion i will try with 0.5 and will let you know the result. Another thing i want you to know, if I make Y+=30 then the problem goes away. with courant no =20. but the results not good as it does not capture separation. |
i tried that method but still doesnot work.Residuals still increasing
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So, do the Grid Independence Test Make the three cases of element size and compare the results. |
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i seek some suggestion, someone say to calculate time step for this case, but i dont know how to calculate time step. |
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