[General] Problem in the calculation of the normal gradient on a boundary face

N1colas · June 26, 2013, 09:45

Hi everyone,

I have a big problem with something a priori easy to calculate but in which I really don't succeed to do...

I want to calculate a heat flux in a flat plate (with a thickness) and so I calculate the gradient of the temperature (with GradientOfUnstucturedDataSet). In then take the component of the gradient which is normal to the face I want to have the heat flux.

In the solid, the values given are good (non zero) and equal to the theoretical values, ok...

But when I want to show the normal component of gradient on a boundary face by using ExtractBlock and then ExtractSurface, the values of the gradient are 0 everywhere...

But in the volume it is still non zero !

I can add that I have tried to do some projection from the volume values to the boundary face by using "PointDataToCellData" and "Cell centers" but it doesn't work...

Do someone can help me about this? Is it a known bug ... ?
I'm using Paraview 3.14.1 64-bit on ubuntu 12.10, and I have also tried in Paraview 4.0 ...

Thank you so much !

Nicolas

francois · June 28, 2013, 09:38

up, I'm also interested in the answer
Thanks for your help

Cheers,
Francois

June 26, 2013, 09:45	Problem in the calculation of the normal gradient on a boundary face	#1
N1colas New Member Join Date: Jun 2013 Posts: 2 Rep Power: 0	Hi everyone, I have a big problem with something a priori easy to calculate but in which I really don't succeed to do... I want to calculate a heat flux in a flat plate (with a thickness) and so I calculate the gradient of the temperature (with GradientOfUnstucturedDataSet). In then take the component of the gradient which is normal to the face I want to have the heat flux. In the solid, the values given are good (non zero) and equal to the theoretical values, ok... But when I want to show the normal component of gradient on a boundary face by using ExtractBlock and then ExtractSurface, the values of the gradient are 0 everywhere... But in the volume it is still non zero ! I can add that I have tried to do some projection from the volume values to the boundary face by using "PointDataToCellData" and "Cell centers" but it doesn't work... Do someone can help me about this? Is it a known bug ... ? I'm using Paraview 3.14.1 64-bit on ubuntu 12.10, and I have also tried in Paraview 4.0 ... Thank you so much ! Nicolas Last edited by N1colas; July 1, 2013 at 04:22.

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June 28, 2013, 09:38		#2
francois Senior Member Francois Beaubert Join Date: Mar 2009 Location: Lille, France Posts: 147 Rep Power: 17	up, I'm also interested in the answer Thanks for your help Cheers, Francois