I have something like this mesh2D = UnitSquareMesh(num_elem, num_elem) space2D = FunctionSpace(mesh2D, 'P', 1) mesh1D = IntervalMesh(num_elem, 0.0, 1.0) space1D = FunctionSpace(mesh1D, 'P', 1) ... f1D = interpolate(something, space1D) and now I would like to do something like f2D = interpolate…

You should consider using the Lagrange Interpolator, see: [image] Data projection from one mesh to another mesh variational formulation For interpolation between non-matching meshes, see the LagrangeInterpolator . You can Also consider the answers given at the old Q&A-site …

It seems to me that those solutions work fine if the two meshes correspond to the same geometry. Maybe there is a solution written in the links you gave me but I am to new to FEniCS to understand them. But at least something compiles now, so maybe I can ask here for further problem. Or should I open…

The key here is that the ordering of the mesh coordinates are not the same as the function space degrees of freedom. This becomes quite clear if you use a higher order function space. Therefore, replace coor = mesh1D.coordinates() with coor = space1D.tabulate_dof_coordinates(). you can do the sam…

I tried to mark both of your answers as solutions but this is not-so-unexpectedly not possible. Perhaps I should have opened another thread. Yes, this is quiet very clear, I should have seen that myself… I might have a follow up question but I will open a new thread if needed. Thank you.

I used the “N1curl” element. How can I do something similar？ LagrangeInterpolator is invalid for “N1curl”

Is it possible to interpolate a function from 1d mesh to 2d mesh

mesh

dokken March 11, 2020, 6:24pm 2

You should consider using the Lagrange Interpolator, see:

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Is it possible to interpolate a function from 1d mesh to 2d mesh

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