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Mathematica

Changes to NDSolve from MMA10.0 to later versions

Hi,

some time ago I posted a question on "Intersection boundary problems when solving PDEs". It appears that in MMA10.0 I can run the following code without any problems (?):

mr = DiscretizeGraphics[ExampleData[{"Geometry3D", "SpaceShuttle"}]];

uif = NDSolveValue[{Inactive[Laplacian][u[x, y, z], {x, y, z}] == 0, 
    DirichletCondition[u[x, y, z] == 1, z <= -1.3]}, 
   u, {x, y, z} \[Element] mr];

Needs["NDSolve`FEM`"]
ElementMeshSurfacePlot3D[uif, Boxed -> False, ViewPoint -> {0, -4, 2}]

It gives:

enter image description here

If I run it in 10.1, 10.2 or 10.3 I get:

enter image description here

Does anyone know what has happened?

Cheers,

Marco
POSTED BY: Marco Thiel
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Sorry, a bit unprofessional, but I just noticed that :

mr = BoundaryDiscretizeGraphics[ExampleData[{"Geometry3D", "SpaceShuttle"}]];
uif = NDSolveValue[{Inactive[Laplacian][u[x, y, z], {x, y, z}] == 0, 
    DirichletCondition[u[x, y, z] == 1, z <= -1.3]}, 
   u, {x, y, z} \[Element] mr];

Needs["NDSolve`FEM`"]
ElementMeshSurfacePlot3D[uif, Boxed -> False, ViewPoint -> {0, -4, 2}]

does work in 10.3.

Cheers,

Marco
POSTED BY: Marco Thiel
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