For some reason, my below reply did not get posted on Google Groups. Resending it again.
From: Fang, Qianqian
Sent: Tuesday, September 8, 2020 12:34 PM
To: iso2mes...@googlegroups.com;
sitanshu iyengar
Subject: Re: [iso2mesh-users] Negative tetrahedral volumes
hi Sitanshu,
check two things:
First, check to see if you have exported the element label (5th column of elem, if present) correctly - often times, if the label was treated as node indices, it can confuses the validator.
Next, call meshreorient.m to ensure all elements have positive volume, like
newelem=meshreorient(node(:,1:3),elem(:,1:4));
see
https://github.com/fangq/iso2mesh/blob/master/meshreorient.m
let me know if this can fix the problem.
Qianqian
Thank you.
Sincerely
Sitanshu
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That’s a helpful comment, thanks for sharing your successful conversion.
From your comment, looks like Abaqus assumes the node orientation of the tet is different from iso2mesh – iso2mesh assumes the node orientation so that it’s volume is positive, looks like Abaqus assumes the opposite (negative volume). Flipping any two columns will flip the sign of the volume.
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