Transcript Short Term : POLYFLOW 3.6.0

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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Volume Decomposition Examples
5-1
© Fluent Inc. 7/18/2015
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Decomposition


Suggestions of how to decompose single volumes into multiple mesh-able
volumes are shown in these examples.
The following meshing tools are used:
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Map
Submap
Tet-primitive
Cooper
Volume decomposition is not needed for the Stairstep or TGrid tet/hybrid
meshing schemes.
5-2
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
First Example (1)

A spherical void inside a brick
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Construction
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Create a sphere, a brick and a cylinder using volume primitives. The cylinder diameter
should be smaller than the sphere and its length extending outside the brick
Subtract the sphere from the brick
Decomposition
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Split the brick using the cylinder
Create edges going diagonally over the top and bottom face of the brick and use the
edges to create a diagonal face
Split the brick-like volume using this face

Last two steps are not necessary but create higher quality mesh.
5-3
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
First Example (2)

A spherical void inside a brick

Three of the four Cooper-able volumes
source faces
source faces
5-4
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Second Example (1)
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A handle
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Construction:
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Create a torus and a brick using volume primitives
Split the torus using the brick Face as a tool
Delete the left part of the torus
Decomposition:

Make a Bidirectional split of the remaining volumes
5-5
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Second Example (2)

A handle

Alternative Construction/Decomposition:
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Create a torus and a brick using volume primitives
Perform a bi-directional split using the two volumes
Delete the part of the torus that is outside the back of the brick
Unite back the block and the pipe section inside the block again
5-6
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Second Example (3)

A handle

The two volumes meshed by the Cooper - tool
source face
source faces
5-7
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Fluent User Services Center
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Third Example (1)

A box with rounded corners
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Construction
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Create a brick using volume primitives
Use the blend option to round off one corner and three edges using the same
radius (Setback option)
Decomposition:
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Create a second brick of the same size as the radius of the blend and move it
such that its corner coincides with the center point of the blended corner.
Split off the the rounded corner
Sweep out the three triangular faces created by the split to the opposite ends
of the brick
Split off the three prismatic volumes from the main volume
5-8
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Third Example (2)

A box with rounded corners
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The volume can be meshed using the submap (1), the tet-primitive (not
shown) and the Cooper (3) schemes.
source
face
source faces
5-9
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fourth Example (1)
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Pipe-pipe intersection (different radii)
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Construction:
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Create the pipes using volume primitives
Create a stretched brick with a rectangular cross-section, where the side
length should be between the two pipe diameters.
Decomposition
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Split the main pipe using the brick
Unite the brick cut-out with the small cylinder
5-10
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fourth Example (2)

Pipe-pipe intersection (different radii)
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The three volumes meshed using the Cooper tool
source faces
source faces
source faces
5-11
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fifth Example (1)

A sphere in three volumes
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Construction
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Create a sphere using volume primitives
Decomposition:
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Create a cylinder and split the sphere using the cylinder
Create a brick and move it such that one side of the brick is along the center of
the cylinder
Split the annular remainder of the sphere into two volumes
All three volumes are basic Cooper-able volumes
5-12
© Fluent Inc. 7/18/2015
Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fluent User Services Center
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Fifth Example (2)

A sphere

The final mesh for two of the volumes
source faces
source faces
5-13
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fifth Example (3)
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A sphere in eight volumes
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Alternative Construction/decomposition
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Create a sphere and a brick using volume primitives
Intersect the two volumes to create a sphere octant
Make a second copy by the use of Copy/Reflect and the z-plane
Make six octants more using Copy/Rotate and 90 degree angle, twice
Connect all faces using Real Connect
The same geometry could also have been created by splitting a sphere in all
three major planes
This decomposition will create a better mesh quality
5-14
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Fluent User Services Center
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Introductory GAMBIT Notes
GAMBIT v2.0
Jan 2002
Fifth Example (4)
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A sphere
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The final mesh for seven out of the eight octants, all meshed using
Tet Primitive
5-15
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