Element Size-Any effect to solution other than accuracy?
Element Size-Any effect to solution other than accuracy?
(OP)
Hi,
Would like to know as in my previous qn if element size has a part to play in the solution other than accuracy. This is because after reducing the element size (to get a better accuracy), i'm unable to get a solution (i.e. error msg in the .f06 file). However, it was ok when i was using a coarser mesh. Pls help. Thanks.
Regards.
Would like to know as in my previous qn if element size has a part to play in the solution other than accuracy. This is because after reducing the element size (to get a better accuracy), i'm unable to get a solution (i.e. error msg in the .f06 file). However, it was ok when i was using a coarser mesh. Pls help. Thanks.
Regards.





RE: Element Size-Any effect to solution other than accuracy?
pj
RE: Element Size-Any effect to solution other than accuracy?
^^^ USER FATAL MESSAGE 9050 (SEKRRS)
^^^ RUN TERMINATED DUE TO EXCESSIVE PIVOT RATIOS IN MATRIX KLL.
^^^ USER ACTION: CONSTRAIN MECHANISMS WITH SPCI OR SUPORTI ENTRIES OR SPECIFY PARAM,BAILOUT,-1 TO
CONTINUE THE RUN WITH MECHANISMS.
RE: Element Size-Any effect to solution other than accuracy?
RE: Element Size-Any effect to solution other than accuracy?
A few qns...
1. How is it possible to lose constraints when mesh size is changed? Is it something to do with the relation between the constraint and the elements. How do I check whether it is lost?
2. I kept the constraints to the same, only changing the mesh size, how do I constraint it properly? Delete the constraints and apply them again?
3. How to check for free body motion before actual running the whole analysis?
Regards.
RE: Element Size-Any effect to solution other than accuracy?
pj
RE: Element Size-Any effect to solution other than accuracy?
If you have modeled the constraints to be nodal based rather than geometry based, you will most likely lose the relationship between the node and constrain when you remesh. Not sure what pre you are using, but FEMAP and others have geometry based constraints which stay in place regardless of mesh mods. Yes, delete your old constraints and reapply. See if geometry based constraints can be applied and use them when possible. As for RBM, you may be able to use your preprocessor to check the maximum separation of constraints in your model. If any constraint spacing is zero in whichever coordinate system you are using, you may have inadequate constraints. You can also do a modal analysis to see if you have an ~ zero frequency mode. If so, there is a good chance you may have a constraint issue.
rjw57