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lift and drag force oscillation

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Old   December 6, 2017, 13:12
Default lift and drag force oscillation
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i am modeling NACA0015 in Fluent
in the first step i want to check Independence of the mesh.
i create a mesh and make it finer and finer but each time i make it fine, my lift and drag force become more unstable.
i modeling in Steady State condition.
Re = 100000 and use k-omega SST for turbulence.
and Y+ in under 1 ( almost near 0.01 )

it is true that is drag and lift oscillation ?

thank you
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airfoil 2d, drag and lift, fluent, naca0015

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