fluent6
TRANSCRIPT
-
7/30/2019 fluent6
1/15
Fluent Inc. 12/28/20125-1
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Volume Decomposition Examples
-
7/30/2019 fluent6
2/15
Fluent Inc. 12/28/20125-2
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Decomposition
Suggestions of how to decompose single volumes into multiple mesh-able
volumes are shown in these examples.
The following meshing tools are used:
Map Submap
Tet-primitive
Cooper
Volume decomposition is not needed for the Stairstep, Hex/Core or TGrid
Tet/Hybrid meshing schemes.
-
7/30/2019 fluent6
3/15
Fluent Inc. 12/28/20125-3
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
First Example (1) A spherical void inside a brick
Construction
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
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.
-
7/30/2019 fluent6
4/15
Fluent Inc. 12/28/20125-4
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
First Example (2)
A spherical void inside a brick
Three of the four Cooper-able volumes
source faces
source faces
-
7/30/2019 fluent6
5/15
Fluent Inc. 12/28/20125-5
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Second Example (1)
A handle Construction:
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
-
7/30/2019 fluent6
6/15
Fluent Inc. 12/28/20125-6
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Second Example (2)
A handle Alternative Construction/Decomposition:
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
-
7/30/2019 fluent6
7/15 Fluent Inc. 12/28/20125-7
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Second Example (3)
A handle The two volumes meshed by the Cooper - tool
source faces
source face
-
7/30/2019 fluent6
8/15 Fluent Inc. 12/28/20125-8
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Third Example (1)
A box with rounded corners
Construction
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: 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
-
7/30/2019 fluent6
9/15 Fluent Inc. 12/28/20125-9
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Third Example (2)
A box with rounded corners
The volume can be meshed using the submap (1), the tet-primitive (not
shown) and the Cooper (3) schemes.
source facessource
face
-
7/30/2019 fluent6
10/15 Fluent Inc. 12/28/20125-10
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fourth Example (1)
Pipe-pipe intersection (different radii) Construction:
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
Split the main pipe using the brick
Unite the brick cut-out with the small cylinder
-
7/30/2019 fluent6
11/15 Fluent Inc. 12/28/20125-11
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fourth Example (2)
Pipe-pipe intersection (different radii)
The three volumes meshed using the Cooper tool
source faces
source faces
source faces
-
7/30/2019 fluent6
12/15 Fluent Inc. 12/28/20125-12
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fifth Example (1)
A sphere in three volumes
Construction
Create a sphere using volume primitives
Decomposition:
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
-
7/30/2019 fluent6
13/15 Fluent Inc. 12/28/20125-13
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fifth Example (2)
A sphere
The final mesh for two of the volumes
source faces
source faces
-
7/30/2019 fluent6
14/15 Fluent Inc. 12/28/20125-14
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fifth Example (3)
A sphere in eight volumes
Alternative Construction/decomposition
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
-
7/30/2019 fluent6
15/15 Fluent Inc 12/28/20125-15
Fluent User Services Center
www.fluentusers.com
Introductory GAMBIT Notes
GAMBIT v2.1 Jul 2003
Fifth Example (4)
A sphere
The final mesh for seven out of the eight octants, all meshed using
Tet Primitive