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I have carried out a CFD simulation (with finite volume method) to investigate the unsteady force enforced to the vehicle body. The horizontal tail keeps flapping in sinusoidal function. As a result, the force coefficient should be also in sinusoidal form.

And then, I plot the force coefficient. It meets my expection, i.e. with a sinusoidal form. But the numerical result seems not smooth. What are the reasons to cause this phenomenon?

enter image description here

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  • $\begingroup$ Can you give a little more detail?, In particular the formulation of the simulation (FV, FEM, DG etc), steady state or transient, the resolution of the surface your getting the coefficient from. It could be as simple as an artifact of the discretisation or something more serious like an instability. $\endgroup$ – user3209427 Aug 1 '18 at 7:13
  • $\begingroup$ @user3209427 I have supplied more details as far as I could. If there lack any critical information, please let me know. I am a green finger in CFD. $\endgroup$ – PureLine Aug 1 '18 at 7:47
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    $\begingroup$ At which points (and how) is your force coefficient evaluated? is an interpolation applied? $\endgroup$ – Anton Menshov Aug 1 '18 at 12:14

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