Are you calculating vorticity within Paraview or using FieldConvert. Since it is is the former you can calculate the vorticity field using the module vorticity (-m vorticity) and it will differentiation the polynomial basis rather than using a linear approximation from Paraview. By default using Fieldconvert to get the .vtu file for preview (BTW .plt files are binary and usually quicker for output) we dump the solution at typically P+1 points where P is the polynomial order. You can however use the -n X option to specify more points to dump the solution where X is the number of points in each 1D direction.

On 7 Feb 2021, at 17:17, Yong Wang <yongwang.ttu@gmail.com> wrote:

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Hello Nektar++ Users,

I am curious about how to best post-process simulated high-order results from Nektar++. I tried using Paraview to generate the contour plot of the vorticity field, but it seems quite blurry, which is due to, in my understanding, that Paraview uses linear interpolation to interpret the high-order results. I am currently using Matlab to generate the contour plot with high-order interpolations from a for-loop of the element-wise results, but it requires a lot of tweaking, calculation time, and data extraction. Do you have some advice on the post-processing of high-order results from Nektar++? Much appreciated.

Thanks,

Yong Wang

Ph.D. Candidate

National Wind Institue

Texas Tech University

Lubbock, TX, US

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