[YoniHe]

I have generated a .su2 mesh file for NACA0012 by the use of gmsh. When use SU2_CFD to calculate the flow (viscous), there is a problem in the step of "Geometry Preprocessing", which is displayed as:
The surface element (0, 0) doesn't have an associated volume element. Can anyone give me some advice to cope with such problem?

My calculation conditions are: Ma=0.7, AOA=2, Re=1.6e7. The grid is composed of quadrangles near the airfoil (boundary layer) and triangles in the other domain, with a refinement of mesh after the trailing edge to capture the wake characteristics.

[economon]

Hi,

It seems that the mesh you are using may have an issue with the connectivity. Are there extra markers (boundary cells) included in the mesh that aren't necessary? Perhaps there is a degenerate cell on the boundary (maybe the trailing edge)?

That particular error means that the first element of the first marker does not have neighboring cell(s) in the volume mesh. Another thing you can do is open the .su2 mesh file, search for the keyword "MARKER," and then check that the node index values given for the first element of the first marker make sense (and that the x,y,z coordinates for those nodes under the "NPOIN" section of the mesh also make sense).

Hope this helps,

Thomas D Economon
SU2 lead developer

[shank19]

Hi,

I am also facing a similar problem. I generated a 3-D mesh for SU2 using gmsh and I get the following error
"The surface element (0, 65622) doesn't have an associated volume element"

In fact, this point is near the trailing edge.
I believe gmsh includes the Elementary points in the mesh files which create such errors, but I am not sure about it. Please help if you are familiar with such errors.

PS:Total number of elements in my mesh is around 350,000 so it's quite difficult for me to find out the error source.

Thanks in advance