# mesh file for flow over a circular cylinder

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 March 30, 2010, 17:27 mesh file for flow over a circular cylinder #1 Member   Ardalan Join Date: Feb 2010 Location: Baku Posts: 50 Rep Power: 16 -I'm looking for a 2d tetrahedral structured mesh for flow over a cylinder can anyone provide me with the mesh file? I want to use it in my code written in fortran -Is there any website where the mesh files (coordinates of mesh nodes) for common simple flow situations (such a flow over a cylinder, airfoils,...) can be find? -I've tried to mesh using Gambit but it doesn't reach a good quality for numerical solution. also I have problem using the data (coordinates of nodes) because gambit doesn't give them in order which is suitable. the mesh point numbers are ordered by the order of their creation. - Assuming some node coordinates are given, do you have any idea about an algorithm to sort them? maybe if I can write such an code, my problem with gambit can be solved! Please help me with the 4 cases mentioned above.

 April 3, 2010, 17:11 #2 Member   Ardalan Join Date: Feb 2010 Location: Baku Posts: 50 Rep Power: 16 any answers? I mean if we have coordinates of vertices in a structured mesh, how can we determine which vertices are neighbors and connected to each other? In other words how can we sort the vertices of input mesh?

 April 15, 2010, 16:54 Grids on an airfoil or cylinder #3 Member   Ardalan Join Date: Feb 2010 Location: Baku Posts: 50 Rep Power: 16 Does anyone know a free fortran code which generates structured grids, (C, H or o-mesh but H-mesh is preferable for me) with good quality over an airfoil or cylinder?

 April 16, 2010, 01:17 #4 Member   L.Y LIN Join Date: Mar 2010 Posts: 49 Rep Power: 16 hi,i think we are doing the similar thing recently.i am using unstructured grids for this problem,and i get structured grids from gambit.i do not know wheather *.mesh file is for the structured grids.in my case ,i used *.neu file and it will give me unstructured information.so maybe you should use *.mesh?...my guess

 April 16, 2010, 04:20 #5 Member   Ardalan Join Date: Feb 2010 Location: Baku Posts: 50 Rep Power: 16 Hi thanks for your response May I ask you how you use your mesh file in your code? for example which file format do you use to export your mesh information to your code? I want to use only mesh points coordinates but I don't know how to use them! as I mentioned in the forum gambit doesn't give them in order which is suitable. the mesh point numbers are ordered by the order of their creation. I mean I'm seeking for a format which gives mesh cells orderly and also gives its four vertices. In the unstructured case, assuming you have the mesh nodes coordinates, how do you know how are the connected which cells are neighbor of each other?

 April 17, 2010, 23:40 #7 Member   L.Y LIN Join Date: Mar 2010 Posts: 49 Rep Power: 16 *.neu means neutral ,right? thanks ztdep!it is very useful.

December 15, 2020, 13:06
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Bappi
Join Date: Dec 2020
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Quote:
 Originally Posted by Ardalan -I'm looking for a 2d tetrahedral structured mesh for flow over a cylinder can anyone provide me with the mesh file? I want to use it in my code written in fortran -Is there any website where the mesh files (coordinates of mesh nodes) for common simple flow situations (such a flow over a cylinder, airfoils,...) can be find? -I've tried to mesh using Gambit but it doesn't reach a good quality for numerical solution. also I have problem using the data (coordinates of nodes) because gambit doesn't give them in order which is suitable. the mesh point numbers are ordered by the order of their creation. - Assuming some node coordinates are given, do you have any idea about an algorithm to sort them? maybe if I can write such an code, my problem with gambit can be solved! Please help me with the 4 cases mentioned above.
Hi,

I have generated a 2D mesh using Gambit and now I need to read the mesh that is generated. Did you write any program in Fortran for file conversion? Do you mind sharing it with me? I am really struggling with it and I would appreciate if you can please help me out.

Thanks
Bappi