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'Narrow contraction' mesh

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Old   October 8, 2021, 07:57
Default 'Narrow contraction' mesh
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RMV
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Rick Veldhuizen
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Hi REEF3D team,

First of all, thanks for creating REEF3D. It looks really promising for a wide range of (hydrodynamic) applications.

I'm trying to carry out the 'narrow contraction' tutorial, but the default mesh does not seem to be properly generated (see image).

Default control settings:

C 11 1
C 12 21
C 13 21
C 14 2
C 15 21
C 16 3

B 1 0.05
B 130 1

F 3 0.0 0.5
F 11 0.0 0.8 0.6 0.6
F 11 0.8 1.1 0.6 0.4
F 11 1.1 1.4 0.4 0.4
F 11 1.4 1.7 0.4 0.6
F 11 1.7 2.5 0.6 0.6

F 21 0.0 0.8 0.0 0.0
F 21 0.8 1.1 0.0 0.2
F 21 1.1 1.4 0.2 0.2
F 21 1.4 1.7 0.2 0.0
F 21 1.7 2.5 0.0 0.0

M 10 4

Any feedback would be greatly appreciated.

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File Type: jpg narrow_contraction.jpg (88.8 KB, 5 views)

Last edited by RMV; October 8, 2021 at 09:45.
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Old   October 8, 2021, 12:05
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Felix S.
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I had the same problem in version 21.04. I think the freecoor part of DiveMesh is not continued anymore in the current and last version (take a look at the release-notes in GitHub). That is why I think this tutorial is not working anymore.
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Old   October 8, 2021, 13:27
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Hans Bihs
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Hi Rick and Felix,

sorry for the oversight regarding the tutorial case, we will update it. Yes, the freecoor option has been removed. Please use the solid options instead.
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Old   October 12, 2021, 09:37
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Rick Veldhuizen
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Hi Hans,

Thanks for the reply! How would we then generate a non-rectangular mesh (such as a contraction or sloping bottom) without importing an STL file?
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Old   October 18, 2021, 05:18
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Hans Bihs
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Hi Rick,

REEF3D is built around the immersed boundary method, so a rectilinear (optionally non-uniform) mesh is used. Complex structures are simply immersed into the mesh. This make the grid generation process relatively straightforward and enables us to employ high-order methods when solving the governing equations.
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Old   October 19, 2021, 04:53
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Hi Hans,

Thanks a lot, I get it now!
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