[General] [Paraview] Non-zero heatflux across an adiabatic surface

AlphaOrionis · March 5, 2020, 11:32

Hello everyone,

I'm new in this forum and using Paraview, also english is not my mother tongue, so thank everyone in advance for your patience.

I have a problem with an adiabatic wing simulated in SU2 which I'm post-processing in Paraview 5.7, but it tells me I have a non-zero heatflux along the surface.

This tutorial of SU2:
https://su2code.github.io/tutorials/Turbulent_ONERAM6/
is a similar case, with an adiabatic wall (in the config file, MARKER_HEATFLUX= ( WING, 0.0 )), and when I check heatflux along the surface in Paraview (surface_flow/Integrate Variables), it gives me -3614 (????).

What I'm doing wrong? I already tried ExtractSurface/Generate Surafe Normals and Gradient of Unstructured DataSet.

Could someone help me?
Thank you so much

arleus · March 26, 2020, 07:28

Did you manage to figure out what was wrong? I am a new user to SU2 and don't understand why this happens.

landsber · July 16, 2020, 02:08

I am also interested to know if you resolved the issue.

arleus · July 16, 2020, 03:47

Hi landsber, I did not exactly resolve the issue, but I did learn a few things (which you may already know!).

I found that the heat flux approaches zero as the convergence improves. It takes much longer for the heat flux to converge than the usual forces and moments.

I also found that the convergence of the heat flux was very sensitive to the quality of the boundary layer mesh. I used a structured mesh with a growth rate of 1.1 to get better results. Originally, I was using 1.2, but this did not allow my heat flux to converge well.

Another thing that I did not realise is that although my numbers look large, they were small compared to a case with ‘real’ heat flux. E.g. I also simulated my case with an isothermal wall, and in comparison the heat flux from the adiabatic wall solution looked very small.

March 5, 2020, 11:32	[Paraview] Non-zero heatflux across an adiabatic surface	#1
AlphaOrionis New Member Jaime Join Date: Mar 2020 Posts: 1 Rep Power: 0	Hello everyone, I'm new in this forum and using Paraview, also english is not my mother tongue, so thank everyone in advance for your patience. I have a problem with an adiabatic wing simulated in SU2 which I'm post-processing in Paraview 5.7, but it tells me I have a non-zero heatflux along the surface. This tutorial of SU2: https://su2code.github.io/tutorials/Turbulent_ONERAM6/ is a similar case, with an adiabatic wall (in the config file, MARKER_HEATFLUX= ( WING, 0.0 )), and when I check heatflux along the surface in Paraview (surface_flow/Integrate Variables), it gives me -3614 (????). What I'm doing wrong? I already tried ExtractSurface/Generate Surafe Normals and Gradient of Unstructured DataSet. Could someone help me? Thank you so much Last edited by AlphaOrionis; March 5, 2020 at 12:56.

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March 26, 2020, 07:28		#2
arleus New Member Join Date: Jun 2013 Posts: 2 Rep Power: 0	Did you manage to figure out what was wrong? I am a new user to SU2 and don't understand why this happens.

July 16, 2020, 02:08		#3
landsber New Member Alex Landsberg Join Date: Sep 2009 Location: Australia Posts: 15 Rep Power: 0	I am also interested to know if you resolved the issue.

July 16, 2020, 03:47		#4
arleus New Member Join Date: Jun 2013 Posts: 2 Rep Power: 0	Hi landsber, I did not exactly resolve the issue, but I did learn a few things (which you may already know!). I found that the heat flux approaches zero as the convergence improves. It takes much longer for the heat flux to converge than the usual forces and moments. I also found that the convergence of the heat flux was very sensitive to the quality of the boundary layer mesh. I used a structured mesh with a growth rate of 1.1 to get better results. Originally, I was using 1.2, but this did not allow my heat flux to converge well. Another thing that I did not realise is that although my numbers look large, they were small compared to a case with ‘real’ heat flux. E.g. I also simulated my case with an isothermal wall, and in comparison the heat flux from the adiabatic wall solution looked very small.