Hi everyone, I’m running a slope stability problem using the large strain mode. My model mesh runs smoothly for model solve elastic and model solve for the plastic problem and large strains turned off commands. However, the cycling process for some excavation stages has stopped due to illegal geometry warnings from zones.
Has somebody had to handle the illegal geometry issue?, any strategies to fix it without re-meshing in Griddle?
I’ve tried to solve it by modifying the zone geometry tolerance without success. Do you know what a geometry tolerance acceptable range is?
Thank you in advance for any light on this matter.
Hello @puertame,
I would first check to see if the displacements in those particular zones are realistic. If not, it may be that your model is unstable in that area. Secondly, I would suggest refining the mesh in the problem area or using the zone geometry-test ( doc here ) command to see if any zones have an undesirable shape.
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Hi @dblanksma @puertame, I am also going through the same error and I was able to identify zones which got distorted during gradual loading and at a point the error occured. The thing I am not able to think of is "When the same zone is subjected to the same load “without geogrid layers, everything is fine” but when I add 2 geogrid layers in that layer, the zones deforms and the illegal geometry error occured… What could have I miss when I add structural element (geogrid) in the zone that such error occured? How can we solve such error? I tried to increase the no. of mesh in that layer but still the result is same. I have provided boundary condition to the whole model. DO I need to apply boundary condition (fixing velocity) to the geogrid again even though its edges are already in the constrained boundary from the earlier constraints?