Hello Zhen,

Nektar++ outputs velocity as a scalar components. However, paraview draws stream traces from a vector. You need to concerts scalar components to vector within paraview.

Use a calculator to create the velocity vector:

u*iHat + v*jHat + w*kHat. 

And then use this vector to draw stream traces.

Aidyn

On Wed, May 15, 2019, 16:33 zxiong@sas.upenn.edu <zxiong@sas.upenn.edu> wrote:

Dear all,

I use nektar++ to do a simulation and visualize the result in Paraview. The simulation domain is a 3D cylinder and it computes velocity in three directions(x,y,z-axis) and pressure of blood flow. 

However, I can't use stream tracer filter in Paraview. I read the tutorial of Paraview and can successfully use stream tracer on data inside Paraview. Do I need to compute something else to enable the function stream tracer filter of Paraview? Is there any suggestion？

Many thanks!

Best,

Zhen

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