excessively distortion and too large simulation time
excessively distortion and too large simulation time
(OP)
Hi everyone,
I'm trying to do a simulation that a sphere slides on a plate, and meanwhile it moves toward the plate surface (like penetrating into the plate). However, it always fails at the beginning because of excessively distortion. After I improved the mesh quality, it can process further, until the excessively distottion problem happens again. I double checked the material properties difinition, and the unit consistance, it looks correct.
Also, according to what has finished, the simulation may take two months to complete on a 12 cpu cluster. Previously, I did some other simulations on the same cluster, the sizes of the input files of those simulations were larger than the size of the current one, but they only needed one week to complete. The difference is that the current simulation is smaller structure based on nanometers, while the previous simulations were based on micrometers. In abaqus, I use micrometer based units for both the current and previous simulations.
Could you please help me take a look at my model definition and give me some possible reasons and solutions? Thank you very much! https://www.dropbox.com/s/7kb8bcsdsepiunm/sp-20130...
I'm trying to do a simulation that a sphere slides on a plate, and meanwhile it moves toward the plate surface (like penetrating into the plate). However, it always fails at the beginning because of excessively distortion. After I improved the mesh quality, it can process further, until the excessively distottion problem happens again. I double checked the material properties difinition, and the unit consistance, it looks correct.
Also, according to what has finished, the simulation may take two months to complete on a 12 cpu cluster. Previously, I did some other simulations on the same cluster, the sizes of the input files of those simulations were larger than the size of the current one, but they only needed one week to complete. The difference is that the current simulation is smaller structure based on nanometers, while the previous simulations were based on micrometers. In abaqus, I use micrometer based units for both the current and previous simulations.
Could you please help me take a look at my model definition and give me some possible reasons and solutions? Thank you very much! https://www.dropbox.com/s/7kb8bcsdsepiunm/sp-20130...





RE: excessively distortion and too large simulation time
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: excessively distortion and too large simulation time
RE: excessively distortion and too large simulation time
Are you new to this forum? If so, please read these FAQ:
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: excessively distortion and too large simulation time
I saw that the stable time increment for some elements is very small. But these elements are just cubes rather than poorly meshed elements. I'm wondering that what causes this may be the reason for all my problems.