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Hi.
How are you?
I am running some cases of flow around cylinders and, for the case of Re = 1000, I get curious results.
The lift force history showed strange oscillations like presented in the attached images.
I am using SVV with 64 Fourier modes in z direction for the simulations and my mesh was developed following the descriptions found in a recent publication involving nektar++ and OpenFOAM. I believe that the mesh is not the problem.
There is another option for pressure solution and force calculations? Have you any idea about what I'm doing wrong?

Thank you!
Alessandro