[CIG-SHORT] RuntimeError: Invalid fault mesh: Too many vertices of an element on the fault
Charles Williams
willic3 at gmail.com
Sun Jul 29 18:12:43 PDT 2012
Hi Hongfeng,
In the past, this sort of error has occurred when there is a lot of curvature in the fault in combination with poor mesh quality. I'm assuming you're using a tetrahedral mesh. In that case, having too many vertices on the fault indicates that all 4 vertices for a cell lie on the fault. In your case, this is probably indicative of a poor quality mesh. For example, a very flat cell could have all 4 vertices on the fault. When that happens, it's no longer clear how to split the cell faces to form a cohesive cell. You will need to improve the mesh quality to remove any cells with this sort of problem.
Cheers,
Charles
On 30/07/2012, at 1:03 PM, Hongfeng Yang wrote:
> Hi all,
>
> I am running dynamic rupture simulations on a fault mesh with realistic
> geometry. The simulation was done on a mesh with certain discretization
> size (say d1). However, when I decreased the discretization size of the
> mesh (say d2), PyLith stopped after reading the mesh due to an error,
> Invalid fault mesh: Too many vertices of an element on the fault
>
> I check the mesh quality with grid size of d2 and find there are a lot
> of poor quality elements. But I do not understand how there could be too
> many vertices of one element on the fault surface? What does this error
> message mean, and what is causing the problem?
>
> Thanks,
>
> Hongfeng
>
> --
> Postdoc Investigator
> Woods Hole Oceanographic Institution
> Dept. Geology and Geophysics
> 360 Woods Hole Rd, MS 24
> Woods Hole, MA 02543
>
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Charles A. Williams
Scientist
GNS Science
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New Zealand
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C.Williams at gns.cri.nz
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