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forces on body in oscillatory flow

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Old   April 12, 2018, 13:30
Default forces on body in oscillatory flow
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I am interested in modelling oscillatory flow over a cylinder. I have manged to successfully model and validate the oscillatory flow using the 'uniformFixedValue" boundary condition as per

Oscillatory inlet velocity

Following that, I moved to including the cylinder in the oscillatory flow. The simulation runs just fine but when I look at the forces (drag and lift), it seems that the drag matches the experimental data very well but the lift does not make any sense. I expected the lift to be always positive and also smaller amplitude than what is predicted by the model.

I am pretty sure the simulation is correct but the issue should just be in the force estimation (such as: change of pressure sign due to flow reversal, estimating and using the dynamic pressure in pimpleFoam, ...) but cannot figure out how to resolve this.

I have attached a graph of results. U is the flow velocity. My simulation case can be downloaded from

I would really appreciate any feedback/comments.

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File Type: png Forces.png (58.4 KB, 19 views)
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Old   April 13, 2018, 07:15
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I have answered this in

dynamic pressure in pimpleFoam

in case someone finds it useful.
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forces, oscillatory flow, uniformfixedvalue

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