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Simple vs Coupled which is best for airfoil

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Old   September 23, 2018, 00:25
Default Simple vs Coupled which is best for airfoil
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harsha vardhan
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hello all,

I'm trying to simulate airfoil. I'm using pressure-based solver. the question is does using simple or simplec method can change the result from the result we get from using coupled solver. and if i use coupled solver there is an divergence detected error which i'm not facing using simple at higher angle of attacks.

Thankyou, waiting for your answers
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Old   September 23, 2018, 00:31
subhankar das
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In my simulation of open channel flow, I'm also facing the same problem. For simple or simplec it is converging but for coupled solver it not converged yet. I will suggest you use piso. I heard that piso gives stable solution.
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Old   September 24, 2018, 16:26
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Lucky Tran
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They should all give very similar results if the solution is converging.

You have to tinker and play with a lot of numerical settings. The default settings do not guarantee convergence for all possible problems in the universe. Of course the quality of your initial guess also influences things. My recommendation, use whatever works.
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coupled, simple

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