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Dear Nektar users,

I found an issue in moving cylinder problem in NEKTAR tests. I want to perform quasi 3D simulations over an oscillating cylinder by using mapping function. However, the velocity in the span direction (w) disappears after around 20,000 time-steps. In fact, the problem becomes full-2D after some time steps!

I've tested various initial conditions for w, such as awgn(1) or awgn(1)*cos(2*PI*z/LZ), etc., and different mapping types, but I could not resolve it.

I would be grateful if you could help me how to resolve this issue. The xml file and a screenshot are attached.

Best regards,

Mahdi

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