[Nek5000-users] Vanishing Jacobian error description

[nek5000-users at lists.mcs.anl.gov]

Hi, 

I am running into an issue with 'Vanishing Jacobian'. To help understand what the problem 
is, could someone explain what is meant in the error? Specifically, what it means by "Xth node" of the element. 
Also, I ran into this issue when I was deforming geometries in the usr file, where one of the elements 
would overlap another by mistake. However in this case I know there are no overlaps. 

Here is a portion: 

0 ERROR: Vanishing Jacobian near 91th node of element 69. 
1.40692804605498586E-002 -7.79619559165757245E-003 
0 xyz: 2.65874E-01 3.54498E-01 2.87050E+00 
0 xyz: 2.07855E-01 1.77249E-01 2.87050E+00 


0 ERROR: Vanishing Jacobian near 76th node of element 70. 
2.59472856644434001E-002 -2.12442422718029170E-002 
0 xyz: 2.11655E-01 4.23310E-01 2.62500E+00 
0 xyz: 3.54498E-01 1.77249E-01 2.87050E+00 

Thanks for any help deciphering this error! 

- Michael 





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