How to get the wall temperature?

Qinh · July 22, 2018, 08:45

Hello everyone,

I have simulated the water flowing through a pipe with constant heat flux at the wall using OpenFOAM, and I can obtain the temperature and volicity of the fluid. But how can I get the wall temperature since there is only one fluid computational domain?

Could you please give me some hints? Thank you in advance!

Best regards,
Qinh

jherb · July 23, 2018, 07:07

Do you mean in paraview? Then you have to selected the corresponding wall face in the box "Mesh Regions" before loading the case.

cyss38 · July 23, 2018, 14:47

Warning : on surface, the paraview value can be interpolated value from the internal field. You can open the data file and see if there is value for your patch or if there is only a boundary condition. If there is only a boundary condition (zeroGradient for example), paraview will give interpolated value of the internal field.

Qinh · July 27, 2018, 20:16

Hi Herb and Bonamy,

Thank you for your reply. I want to obtain the temperatuere of the wall which implement constant heat flux to the fluid domain. However, in ParaView, I will get the temperature of the fluid boundary if I select the boundary face. So how can I get the wall temperature if there is a fixedGradient boundary condition ?

cyss38 · July 30, 2018, 03:08

Do you have try to open a result temperature field file to see if there is data in the boundary part?
If it is just write something like following (for result at no zero time step), it is impossible to have the field on the wall (without interpolation).
wall
{
type fixedGradient;
gradient uniform 60;
}

Qinh · July 31, 2018, 21:40

Hello Bonamy,

The temperature file only includes the fluid domain temperature. However, in this case, the wall temperature is used during the calculation process. So how can I obtain the wall temperature ? Or how to interpolate the value from the internal field in ParaView ? Thank you in advance!

cyss38 · August 1, 2018, 16:09

1) To know exactly what the openfoam solver performs, you must found the source files corresponding to your boundary condition and try to understand...

2) To have an interpolated value of the field on the patch with paraview, in paraview you click in the "Mesh Regions" box (at the bottom right) on the patch name (for example wall if it is the name of your patch) and you unselect the internalMesh. Next you click "Apply" and you will see onlly the patch with the value of the field on the patch. The value will be an interpolated value (interpolated by paraview and not openfoam...)

calf.Z · December 20, 2019, 00:25

How can I plot the wall temperature curves along the pipe after visualizing the wall surface?

AMitgM95 · March 10, 2022, 09:51

Hi,

Were you able to estimate the surface temperature? I am also interested in calculating the temperature at the wall's surface to calculate the Nusselt number.

July 22, 2018, 08:45	How to get the wall temperature?	#1
Qinh New Member Richard Join Date: Apr 2018 Posts: 24 Rep Power: 7	Hello everyone, I have simulated the water flowing through a pipe with constant heat flux at the wall using OpenFOAM, and I can obtain the temperature and volicity of the fluid. But how can I get the wall temperature since there is only one fluid computational domain? Could you please give me some hints? Thank you in advance! Best regards, Qinh

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July 23, 2018, 07:07		#2
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 21	Do you mean in paraview? Then you have to selected the corresponding wall face in the box "Mesh Regions" before loading the case.

July 23, 2018, 14:47		#3
cyss38 Member Cyrille Bonamy Join Date: Mar 2015 Location: Grenoble, France Posts: 85 Rep Power: 11	Warning : on surface, the paraview value can be interpolated value from the internal field. You can open the data file and see if there is value for your patch or if there is only a boundary condition. If there is only a boundary condition (zeroGradient for example), paraview will give interpolated value of the internal field.

July 27, 2018, 20:16		#4
Qinh New Member Richard Join Date: Apr 2018 Posts: 24 Rep Power: 7	Hi Herb and Bonamy, Thank you for your reply. I want to obtain the temperatuere of the wall which implement constant heat flux to the fluid domain. However, in ParaView, I will get the temperature of the fluid boundary if I select the boundary face. So how can I get the wall temperature if there is a fixedGradient boundary condition ?

July 30, 2018, 03:08		#5
cyss38 Member Cyrille Bonamy Join Date: Mar 2015 Location: Grenoble, France Posts: 85 Rep Power: 11	Do you have try to open a result temperature field file to see if there is data in the boundary part? If it is just write something like following (for result at no zero time step), it is impossible to have the field on the wall (without interpolation). wall { type fixedGradient; gradient uniform 60; }

July 31, 2018, 21:40		#6
Qinh New Member Richard Join Date: Apr 2018 Posts: 24 Rep Power: 7	Hello Bonamy, The temperature file only includes the fluid domain temperature. However, in this case, the wall temperature is used during the calculation process. So how can I obtain the wall temperature ? Or how to interpolate the value from the internal field in ParaView ? Thank you in advance!

August 1, 2018, 16:09		#7
cyss38 Member Cyrille Bonamy Join Date: Mar 2015 Location: Grenoble, France Posts: 85 Rep Power: 11	1) To know exactly what the openfoam solver performs, you must found the source files corresponding to your boundary condition and try to understand... 2) To have an interpolated value of the field on the patch with paraview, in paraview you click in the "Mesh Regions" box (at the bottom right) on the patch name (for example wall if it is the name of your patch) and you unselect the internalMesh. Next you click "Apply" and you will see onlly the patch with the value of the field on the patch. The value will be an interpolated value (interpolated by paraview and not openfoam...)

December 20, 2019, 00:25		#8
calf.Z Senior Member Jianrui Zeng Join Date: May 2018 Location: China Posts: 157 Rep Power: 7	How can I plot the wall temperature curves along the pipe after visualizing the wall surface?

March 10, 2022, 09:51		#9
AMitgM95 New Member Amit Makhija Join Date: Apr 2018 Posts: 11 Rep Power: 8	Hi, Were you able to estimate the surface temperature? I am also interested in calculating the temperature at the wall's surface to calculate the Nusselt number.