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philosophy of elmer

 
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MessagePosté le: Ven 30 Mar - 10:55 (2018)    Sujet du message: philosophy of elmer Répondre en citant

Hello,


I've worked with some of the tutorials of Elmer, and have a 2 questions. One more philosophical, one more nuts and bolts. I'm a professional engineer, with previous FEA experience solving elasticity problems with integrated solutions (ProEngineer / Mechanica), so though I am not entirely new to FEA, I humbly ask for patience if I ask the obvious (rabak, I believe you're quite busy!)... 


1. Philosophy: Having Elmer, and Lisa Working with Others, I'm Seeing Different Philosophies for Setting Up Problems. Consider a cantilever beam, running in the x-direction, loaded in the y-direction. In Elmer, the "glued" end of the beam is fixed by applying 0 displacements to the entire end-face. This is intuitive, and similar to what I'm used to. LISA however, (a linear FEM software) requires assignment of loads and constraints on a node-by-node basis. Therefore, one tries to account for fish effects on the "glued" end of the beam by (for instance) fixing x-displacement on * all * nodes of the glued-face, then fixing the y-displacement on the * bottom edge * nodes of the glued-face, and then fixing z-displacement on the bottom of the glued face. This is also intuitive in it's own way.
So here's the 'obvious' question # 1: How does elmer (much like Pro / Mechanica) account for the fish-related distortions of the glued-end-face?


2. Convergence, solver, preconditioning, etc: I recall that in one of the tutorials, the instruction is given to change one of the parameters for the solver, to avoid convergence problems. 
So question # 2: Are there tips (or references I should study / learn) for setting the parameters for the solver?



Please help


I did not find the right solution from the internet.


References:
http://www.elmerfem.org/forum/viewtopic.php?f=7&t=583
Product demo video company


Thanks


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