The way to force a surface mesh to be 'constrained' by a line mesh is to include that line into the geometrical definition of the surface. The line should be part of the contour of the surface. In case the line is not, you should divide the surface usinga path of lines containing the required line, ...

Hello, we have finally solved the bugs related to this post. They will be ready for the next developer version to be released soon (14.1.7d). Apart from some specific bug, we have detected that the model have some problems in the definition of some of the volumes. Please, set the Utilities->Repair o...

Hello LongZhu, We have been checking your model and we have detected some problem in GiD at the time to compatibilize the numbers of divisions in lines of structured and semi-structured volumes. We are working to solve it, and we will come back to you when it will be ready. Thanks so much for report...

Hello,
we have finally been able to reproduce this behavior, and we have solved the problem. The next developer version (14.1.4d) will be released with this bug fixed.
Thanks so much for notifying us the bug.

ABEL

you should contact gid_sales (@) cimne.upc.edu in order to solve the problem.

In your case you need to subdivide your surface (circle with circular hole in the middle) into 4-sided surfaces. Each one of them will be able to be meshed with quadrilateral structured mesh such as the one in the figure.

Hello, the option you need is the 'force points to' volume, in this case. The problem is that this option is not available now for semi-structured volumes. We get your request, and we are implementing it. It will be available for the following developer version of GiD. Thanks so much for notifying u...

Hello, you can generate hexahedra elements within GiD if the volumes are structured or semi-structured. To do so, you need to specify one of this kind of structured type to the volume in Mesh menu. Structured volume must have 6 contour surfaces which must be able to be meshed in a structured way (4-...

Hello, I've tried to reproduce the case you are talking about with the model you have attached, and both version 10.0.9 and 14.1.2d of GiD are working properly. In both cases, each one of the surfaces have mesh if the mesh criteria is 'Mesh', and no mesh if the mesh criteria is 'default'. Maybe I'm ...

According to the GiD logo in the snapshot, I guess you are using a really old version (maybe version 7?). This option is in more modern versions.