How can i choose the element size of 3d solid for a topology optimization

The choice depends to:

• Your goal of analysis, your precision
• Your capacity of computing hardware
• Your FEM experiences

For exemple i choose element size = 4 for this solid body 

and i get the result in picture 2  ( with MINDIM=12) 

now how can i say that this element size is suffisant or not ? how can i say it's the right one or not ?

thank you 

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Maybe try with size=3,2,1 and compare all?

if i will whange the size i will reconnect all the fix bolt (beacause i will loose the ID of élements connected with RBE3 ELEMENTS ) 

there is an solution to remesh only the inside of the solidbody without make any difference on the outsides elements connected with other body ?

Than you

HI,

There is no thumb rule for mesh size. You can do a mesh sensitivity analysis to get the right mesh size for your model and use the same for topology optimization.