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How to set up boundary condition for VectorL2FESpace

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3 years 11 months ago - 3 years 11 months ago #2693 by dong
How to set up boundary condition for VectorL2FESpace was created by dong
I tried to set up u=g on the boundary for Stokes problem. I defined the DG FEspace as follows.
Code:
V = VectorL2(mesh,order=2, dirichlet ='left|right|top|bottom',dgjumps=True) Q = L2(mesh,order=1) X = FESpace([V,Q],dgjumps=True)

When I run the code, there is a error at the following line

gfu.components[0].Set(g, BND, definedon=mesh.Boundaries("left|right|top|bottom"))

VectorL2FESpace does not have an evaluator for BND!


The code was attached.
Could you please show me how to set up the boundary condition for VectorL2FESpace or fix this error? Thank you so much.
Attachments:
Last edit: 3 years 11 months ago by dong.
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3 years 11 months ago #2694 by Guosheng Fu
Replied by Guosheng Fu on topic How to set up boundary condition for VectorL2FESpace
l2 space doesnot have dofs on the bdry. you need to impose dirichlet bc weakly
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3 years 11 months ago #2695 by dong
Replied by dong on topic How to set up boundary condition for VectorL2FESpace
I'm a newbie, I don't understand what you've said. Could you please tell me what 'weakly' meant here? Do you know any examples about imposing dirichlet bc weakly with Ngsolve? Thank you.
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