[Ionut G]

Hi all,

I am simulating a test case of a steady state 3D Flat plate flow.
I run the simulation for 500 iterations and for post-processing the results I use Paraview.

I am calculating the pressure gradient in Code_saturne with with a built-in function, "field_gradient_scalar".
The gradient computed by Code_Saturne uses a discretization consistent with that of the code (2-point finite volume with gradient reconstruction), and takes precribed boundary conditions into account.

For the post-processing part, in Paraview I found a filter for calculating the gradient of a variable, "GradientOfUnstructuredDataSet", and I apply this filter to the pressure in order to calculate the pressure gradient.

When I compare the pressure gradient calculated in Code_saturne with the pressure gradient calculated in Paraview I notice some differences.

Does anybody know the reason for these differences?
I didn't found the algorithm that Paraview uses for calculating the gradient with the "GradientOfUnstructuredDataSet" filter.

I attached the figure with the differences that I am talking about.

Thank you,
Ionut

[Fahime]

hi Stelian
Did you find out your answer? I have the same problem.

thanks

[Ionut G]

Hi Fahime

Since I didn't found the formula for how is calculated the gradient in ParaView, I have used the built-in function, from Code_Saturne, "field_gradient_scalar".

Maybe this forum helps https://www.code-saturne.org/forum/v...php?f=2&t=2291

Best Regards,
Ionut