Boundary conditions markers with cgns file

tardiflu · May 30, 2017, 10:42

Hello,

I am trying to run a simulation with SU2 from a 2D mesh in cgns and when I run it, SU2 displays that the configuration file doesn't have any definition for marker AIRFOIL.

The thing is, I checked in the mesh that the boundary walls were defined with the same name as in the .cfg file. ( I kept airfoil and farfield as in the tutorial). That is why I do not understand why SU2 is not able to find the marker...

Here is the section of the code where the boundary conditions are defined :

% ----------------------- BOUNDARY CONDITION DEFINITION -----------------------%
%
% Marker of the Euler boundary (NONE = no marker)
MARKER_EULER= ( airfoil )
%
% Marker of the far field (NONE = no marker)
MARKER_FAR= ( farfield )

% ------------------------ SURFACES IDENTIFICATION ----------------------------%
%
% Marker(s) of the surface in the surface flow solution file
MARKER_PLOTTING = ( airfoil )
%
% Marker(s) of the surface where the non-dimensional coefficients are evaluated.
MARKER_MONITORING = ( airfoil )
%
% Marker(s) of the surface where obj. func. (design problem) will be evaluated
MARKER_DESIGNING = ( airfoil )

Does anyone here encountered the same issue? Thanks for the help!

Sprotte · May 31, 2017, 05:16

Hi,

it might be the case that the boundaries are simply not included in your cgns-file. I don't know the details, but there is a difference between just labeling the boundaries within the software you are creating the mesh with, and exporting them as a self-containing zone of lower-dimensional elements to the file.

And even if the information (i.e. the labels) is actually stored somewhere in your file, SU2 only supports the latter.

In ICEM for example, you can create such zones by the "Create zone..."-function.

Regards, Ole

tardiflu · May 31, 2017, 10:07

Hi and thx for your answer.

I finally managed to solve my problem and it was really simple... In fact, there were boundary conditions in my cgns file called "airfoil" and "farfield", but somehow SU2 wanted it wrote as "AIRFOIL" and "FARFIELD" in the .cfg file. I don't exactly understand why because I checked the mesh file and it wasn't in capital letters but anyway, it solved my issue.

Regards

May 30, 2017, 10:42	Boundary conditions markers with cgns file	#1
tardiflu New Member Lucas Join Date: May 2017 Posts: 5 Rep Power: 9	Hello, I am trying to run a simulation with SU2 from a 2D mesh in cgns and when I run it, SU2 displays that the configuration file doesn't have any definition for marker AIRFOIL. The thing is, I checked in the mesh that the boundary walls were defined with the same name as in the .cfg file. ( I kept airfoil and farfield as in the tutorial). That is why I do not understand why SU2 is not able to find the marker... Here is the section of the code where the boundary conditions are defined : % ----------------------- BOUNDARY CONDITION DEFINITION -----------------------% % % Marker of the Euler boundary (NONE = no marker) MARKER_EULER= ( airfoil ) % % Marker of the far field (NONE = no marker) MARKER_FAR= ( farfield ) % ------------------------ SURFACES IDENTIFICATION ----------------------------% % % Marker(s) of the surface in the surface flow solution file MARKER_PLOTTING = ( airfoil ) % % Marker(s) of the surface where the non-dimensional coefficients are evaluated. MARKER_MONITORING = ( airfoil ) % % Marker(s) of the surface where obj. func. (design problem) will be evaluated MARKER_DESIGNING = ( airfoil ) Does anyone here encountered the same issue? Thanks for the help!

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May 31, 2017, 05:16		#2
Sprotte Member Ole Burghardt Join Date: Mar 2016 Location: Kiel, Germany Posts: 60 Rep Power: 10	Hi, it might be the case that the boundaries are simply not included in your cgns-file. I don't know the details, but there is a difference between just labeling the boundaries within the software you are creating the mesh with, and exporting them as a self-containing zone of lower-dimensional elements to the file. And even if the information (i.e. the labels) is actually stored somewhere in your file, SU2 only supports the latter. In ICEM for example, you can create such zones by the "Create zone..."-function. Regards, Ole

May 31, 2017, 10:07		#3
tardiflu New Member Lucas Join Date: May 2017 Posts: 5 Rep Power: 9	Hi and thx for your answer. I finally managed to solve my problem and it was really simple... In fact, there were boundary conditions in my cgns file called "airfoil" and "farfield", but somehow SU2 wanted it wrote as "AIRFOIL" and "FARFIELD" in the .cfg file. I don't exactly understand why because I checked the mesh file and it wasn't in capital letters but anyway, it solved my issue. Regards