07-25-2021, 07:49 PM
I think the numbering of your TETRA's is not the same as required by most programs I am aware of. The attached zip file shows what the correct ordering number is, as well as 2 MYSTRAN runs using a model containing only 1 of your TETRA elements (#155). The 2 runs are: (1) using the order you have (which results in the negative Jacobian indicating a serious problem) and (2) with a correct ordering which runs successfully. Please take a look at it and let me know what you think