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FE Error Estimate in GTStrudl (Question for Strudl users)

FE Error Estimate in GTStrudl (Question for Strudl users)

FE Error Estimate in GTStrudl (Question for Strudl users)

(OP)
While I am aware that Strudl has three different error Estimating Methods, I mostly relied on changing mesh size to test for convergence or near convergence of the solution – obviously this approach could be time consuming. I would rather use Error Estimate approach, if interpretation of the results in either of methods is manageable.

Here are the questions I want to know to get started:

-    Which one is the better estimating method?
-    Are these methods case specific? – are the methods restricted to be employed under certain conditions only? If so what are these conditions for each method?
-    What are the acceptable errors using each method. Could you locate me any literature with information about acceptable errors when each method is used?

Last but not least, I appreciate any info explaining the analytical roots of error estimate methods used in Strudl.

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