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Differences between cl and cd convergence

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Old   January 20, 2016, 01:22
Post Airfoil Convergence Problems at Low Re
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Hi guys,

I've been simulating a 2d airfoil and I've obtained almost perfect results at high Re (Re 3e6) with SST transition model.

However, whenever I try to simulate at low Re I run into a lot of problems with convergence (Re 3e4):

I've attached a picture where you can see my problem.

I don't know exactly why, but the Cl reaches a steady value and then, it starts to fall.

This happens at 2 of AoA
Attached Images
File Type: png Convergence.png (20.1 KB, 13 views)

Last edited by koalabryant; January 20, 2016 at 16:13.
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airfoil 2d, convergence criteria, fluent

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