Zero mean constraint

General
1

For torsion laplace equation with neumann boundary, we may need add additional boundary (zero mean boundary) to remove singular. How could we add this additional boundary.
Torsion Laplace equation as following:
image

Additional boundary to remove singlarity.
image

Thanks
Jason

2

there is NumberSpace - a finite element space have one globally constant basisfunction. Choose your Lagrange multiplier in NumberSpace

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