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#24 undefined Jacobian error

v1.0_(example)
closed-fixed
nobody
None
5
2014-06-20
2014-06-11
hanjianbin
No

what is the question meaning ?

1 Attachments

Discussion

  • Jean-Paul Ampuero

    This error usually means that there is a problem during mesh generation. One possibility is that the internal nodes of at least one element were not declared in the correct order. What software are you using to generate the mesh?

    I cannot tell from your figure if there is anything pathological about your mesh. Can you provide your mesh file?

     
  • hanjianbin

    hanjianbin - 2014-06-12

    ok ,I send you my mesh file !I want to calculate a basin effect beside the fault .

     

    Last edit: hanjianbin 2014-06-12
  • hanjianbin

    hanjianbin - 2014-06-12

    I use MESH2D . How should I correct the error ?

     
  • hanjianbin

    hanjianbin - 2014-06-12

    I divide the right-top(the domain(3)) to six parts including a semi- semicircle like the figure . In the semi- semicircle ,I use radiation from the center of the circle like the picture . As you say that ,there may be a error in the center of the circle!

     

    Last edit: hanjianbin 2014-06-12
  • Jean-Paul Ampuero

    Your figure 5.png shows at the center of the circle some quad elements that degenerated into triangles (two of their nodes are co-located). Triangular elements are inadmissible in SEM2DPACK. You need to redesign your mesh.

     
  • hanjianbin

    hanjianbin - 2014-06-20

    Thank you ! But I use the below mesh, there is the same problem! I give a length at (0 0) . The dalunwen1 is the main mesh.

     

    Last edit: hanjianbin 2014-06-20
  • Jean-Paul Ampuero

    According to your figure mesh5.png, your new mesh contains some degenerate elements with zero-thickness near the free surface. Those are inadmissible.
    I recommend you add a square domain at the center of the circle.

     
  • hanjianbin

    hanjianbin - 2014-06-20

    ok . thank you !

     
  • Jean-Paul Ampuero

    • status: open --> closed-fixed
     

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