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[General] Problem in calculating Gradient

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Old   March 16, 2015, 06:38
Default Problem in calculating Gradient
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Masaaki Shojima
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Dear specialists, and Dear friends,

I have problems in calculating "Gradient" of a scalar field in Paraview.

Paraview provides several methods to calculate the gradient of a certain scalar, such as
1. Gradient of Unstructured Dataset filter
2. Compute Delivatives filter
3. Phython calculation filter > gradient (scalar)
...and so on.

When I calculated the gradient of a certain scalar such as pressure, the results of paraview would be half compared to those of Ensight and SC/Tetra-post.

Take a look of the attached image, please.
I calculated of a flow in a cylinder using SC/Tetra solver. The results were exported in CGNS file and read in Ensight and Paraview.
Gradient (Pressure) was calculated and Z component of Grad (Pressure) was visualized on the surface.

SC/Tetra post and Ensight provided the same results. But Paraview made a different result. The computed gradient on the surface was half.
This phenomenon occurred in other settings. The values of Grad (velocity-x) or Grad (velocity-y) were also half in paraview compared to Ensight.
I also changed the solver (Frontflow red). But the computed gradient by Paraview was half of other software.

Why the computed gradient becomes half in Paraview ? ? ?

Please teach me, my friends.

Thanks a lot !
Attached Images
File Type: jpg Compare-PressureGrad.jpg (82.1 KB, 80 views)
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ensight, gradient at boundary, paraview

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