Problem of crossed cells while visualizing 3D mesh in 2D using ParaFoam

chandra shekhar pant · September 22, 2019, 02:56

Hello All,

I am trying to visualize the 3 D mesh around an object (for ex aerofoil). I took the object (aerofoil), slice it, then put the internalfield on, and then hide the block. But instead of getting clear cells the cells appeared to be crossed. By looking at the post I even tried the filter "ExtractCellsByRegion", but this also haven't helped. The mesh of crossed grid is attached herewith.

Thanks a lot!

HPE · September 22, 2019, 08:11

(Very likely) Nothing problematic related to the mesh itself. This is just visualisation itself provided by Paraview.

checkMesh utility is your friend to tangibly quantify your mesh quality.

chandra shekhar pant · September 22, 2019, 08:34

May thanks HPE for the prompt reply. But I was just exploring the better way of visualizing the mesh, so that it looks good. Thanks again for the help !

clapointe · October 9, 2019, 10:55

Paraview will visualize using tets by default. The easiest way to visualize the cells (assuming that you are using predominately hexes) is to : load paraview with the "useVTKpolyhedron" box checked. Then you can take a slice through your domain (make sure it's through cells, not on cell faces), and uncheck the "triangulate slice" option for the slice. Then look at the slice as a surface with edges or a wireframe.

Caelan

chandra shekhar pant · October 10, 2019, 02:15

Many thanks Caelan for your help. I am using paraview 5.01, and could not find the "useVTKpolyhedron" although tried to see some of the tutorials also but could not find it. I am very new to the parafoam so sorry for asking this naive query. It will be a great help if you could share the screenshot of the "useVTKpolyhedron".

Thanks again!

clapointe · October 10, 2019, 11:31

Check out this faq : http://openfoamwiki.net/index.php/FAQ/Postprocessing.

Caelan

Flowkersma · October 10, 2019, 13:32

Hi,

ParaView automatically triangulates the slice. Deselect "Triangulate the slice" and select "Crincle slice" in the properties panel to visualize the mesh.

Best, Mikko

chandra shekhar pant · October 11, 2019, 09:06

Hello Mikko,

Wow! it worked...Thanks a lot

Thanks a lot!

September 22, 2019, 08:11		#2
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 932 Rep Power: 12	(Very likely) Nothing problematic related to the mesh itself. This is just visualisation itself provided by Paraview. checkMesh utility is your friend to tangibly quantify your mesh quality. __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

October 10, 2019, 13:32		#7
Flowkersma Senior Member Mikko Join Date: Jul 2014 Location: The Hague, The Netherlands Posts: 243 Rep Power: 12	Hi, ParaView automatically triangulates the slice. Deselect "Triangulate the slice" and select "Crincle slice" in the properties panel to visualize the mesh. Best, Mikko chandra shekhar pant and Andrea1984 like this.

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September 22, 2019, 08:34		#3
chandra shekhar pant Senior Member chandra shekhar pant Join Date: Oct 2010 Posts: 220 Rep Power: 16	May thanks HPE for the prompt reply. But I was just exploring the better way of visualizing the mesh, so that it looks good. Thanks again for the help !

October 9, 2019, 10:55		#4
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 14	Paraview will visualize using tets by default. The easiest way to visualize the cells (assuming that you are using predominately hexes) is to : load paraview with the "useVTKpolyhedron" box checked. Then you can take a slice through your domain (make sure it's through cells, not on cell faces), and uncheck the "triangulate slice" option for the slice. Then look at the slice as a surface with edges or a wireframe. Caelan

October 10, 2019, 02:15		#5
chandra shekhar pant Senior Member chandra shekhar pant Join Date: Oct 2010 Posts: 220 Rep Power: 16	Many thanks Caelan for your help. I am using paraview 5.01, and could not find the "useVTKpolyhedron" although tried to see some of the tutorials also but could not find it. I am very new to the parafoam so sorry for asking this naive query. It will be a great help if you could share the screenshot of the "useVTKpolyhedron". Thanks again!

October 10, 2019, 11:31		#6
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 14	Check out this faq : http://openfoamwiki.net/index.php/FAQ/Postprocessing. Caelan

October 11, 2019, 09:06		#8
chandra shekhar pant Senior Member chandra shekhar pant Join Date: Oct 2010 Posts: 220 Rep Power: 16	Hello Mikko, Wow! it worked...Thanks a lot Thanks a lot!