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Connectivity problem with grids created using gmsh

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Old   April 17, 2017, 10:27
Default Connectivity problem with grids created using gmsh
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Shashank Srivastava
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Hi,

I get the following error when I used a 3-D mesh created using gmsh

"The surface element (0, 65622) doesn't have an associated volume element"

Can you tell me what this error means? I understand that the connectivity is a problem but don't know what to do. The mesh file format is OK.
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Old   May 10, 2017, 05:29
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Tim Albring
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Try to create physical volume along with the physical surfaces.
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Old   May 10, 2017, 05:34
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Shashank Srivastava
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Hi,

I have created physical surfaces and volumes withing gmsh by extrusion.
I assume that's what you mean by physical volumes. Please correct me if I am wrong.

Thanks!!
Shashank
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Old   May 10, 2017, 08:54
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Alberto Pizarro
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You have to add a physical tags to the surfaces you want to add boundary conditions. The lateral surfaces of the extruded volume are not desirable in many cases. And also the extruded volume.
For example:

num[] = Extrude {0,0,1} { Surface{1}; Layers{10}; };
Physical Surface {"boundary"} = (num[]);
Physical Volume {"fluid"} = (num[]);
The variable "num" would contain the surface of the top of the extrusion as num[0], the floor of the extrusion as num[1], and the lateral surfaces of the extrusion as num[2,3...].
If you have more than one surface to extrude, the surfaces corresponding to the second extrusion are stored after the last lateral surface of the first extrusion in num[]. For example, if the first surface has 3 edges, the top of the second extrusion is in num[4].

I hope it can help you.
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