>What does the literature suggest how to handle this situation? 
>
 
 The literature says, I cite: "The nodes that lie inside the void and whose 
nodal support is
 not intersected by the void are removed from the calculations. This is 
performed usually by removing
 the DOFs associated with those nodes from the system of equations and 
solving the system
 only for the remaining DOFs."  The question is how to realise it with 
dealii tools by constrainment of
zero degrees of freedom?



> > Here is a picture of a void with enriched nodes. Blue triangls are 
> enriched 
> > with Heaviside function, red rectangles are zero degrees of freedom. 
> > When there are no whole cells inside a void (only cells intersected by 
> the 
> > boundary are inside a void) I have a regular solution. 
>
> You mean you have a solution for the blue cases but not the red ones? 
>

 I mean that if my mesh is coarse so that I have only intersected cells 
(with blue nodes) in a void, I get a solution
by putting them to be zero inside a void. Enrichment function does the job 
in this case. I showed an example of such
a coarse mesh in the picture beneath.

[image: MeshCoarse.png] <about:invalid#zClosurez>


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