On 3/6/20 11:55 AM, Oleg Kmechak wrote:
But if I change triangulation to hyper_cube, it looks like some hanging
nodes are not constraied. Or it is just Paraview artefact?
It's an artifact. The solution is piecewise quadratic, but what you
output (and what paraview visualizes for you) is a piecewise linear
interpolation of the solution.
You might want to read the documentation of the DataOut::build_patches()
function for more information about how you can get closer to seeing
what actually happens in the program.
Best
W.
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