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Dear All,

I hope everyone is all rights! 
Once I raised this issue before but I wasn't able to resolve it.
I get unphysical oscillation in Reynolds stress calculated by Nektar++.
The footprints of elements are so much that render the results useless.

Below is an example:

image.png
On the contrary, the time-averaged fields are so smooth:
image.png
I am using a quite fine mesh with a p-order of 4:
image.png
The case is quasi-3D with a homogenous z-direction. I am wondering what can be done to mitigate the spurious oscillations.
Please share your thoughts with me. I appreciate any help you can provide.

Kind regards
syavash