The boundary faces of the mesh contain isolated faces

[Jundi He]

Hi

I've generated a mesh, and when I use code saturne to check the mesh, it says that in some of my boundary face groups there are some isolated faces, like:


Family 2
Group "annulus_bot_face"
Number of boundary faces : 750
Number of isolated faces : 15395


In Salome, when I generate my mesh, I use Hexadron(i,j,k) for 3D, Quadrangle (mapping) for 2D and Wire Discretisation for 1D. The top view of my mesh is attached, with 50 division radially on the right and 25 division radially on the left narrow gap. So when I generate the mesh, there are some triangle in the middle, which is shown on the second picture, the triangle will make some prism elements. So when I compute the mesh, it shows a message which is shown is the third picture. Now the problem is, I want to use this mesh in the simulation, it's a perfect structured mesh with some prism elements, but it seems that code saturne recognize some of the faces as isolated faces, even though I already specified these faces into the group. Is there any suggestion or solution? Many thanks for the time!

Best Regards!
Jundi He

[Jundi He]

And in Salome, when I check the mesh information of the "annulus_bot_face" that has some isolated faces, it seems all right. It includes 16145 faces, with 16120 quadrangles and 25 triangles. But when the mesh is export as .med file and read in code saturne, there appears to be some isolated faces which is not in this boundary group.

[Yvan Fournier]

Hello,

Which SALOME version did you use ? How did you build your mesh ? Are you sure you used the same wire discretization for the 3D edges and 2D edges ?
Did you try the "merge nodes" operation ?

Best regards,

Yvan

[Jundi He]

Hi:

I've found the problem, prism is allowed in an hexahedral(i,j,k) algorithm, which is not the problem. The problem is that I have two solid sharing one face, and the mapping mesh of this face in the two solid is not match, which cause the error.

Thanks!