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Background Mesh - Rotor Region
Background mesh is a basic (initial) mesh to be modified and/or refined. Entire surface model must be placed inside the background mesh. Background mesh is created using blockMesh utility. Background mesh is simple block a bit larger than bounding box of the surface model. Alternatively, background mesh can be used to create inlet or outlet of the final mesh (not this case).
Dictionary for blockMesh utility have to be placed in constant/polyMesh/ directory. For rounded object typically an impeller or turbine, it is recommended to create a cylindrical background mesh. The blockMeshDict file may be following:
convertToMeters 1;
vertices
(
/* 00 */ ( -0.05 -0.05 -0.4) // -x -y -z
/* 01 */ ( 0.05 -0.05 -0.4) // x -y -z
/* 02 */ ( 0.05 0.05 -0.4) // x y -z
/* 03 */ ( -0.05 0.05 -0.4) // -x y -z
/* 04 */ ( -0.05 -0.05 0.00) // -x -y z
/* 05 */ ( 0.05 -0.05 0.00) // x -y z
/* 06 */ ( 0.05 0.05 0.00) // x y z
/* 07 */ ( -0.05 0.05 0.00) // -x y z
/* 08 */ (-0.06646803743153546729 -0.06646803743153546729 -0.4) // -x -y -z
/* 09 */ ( 0.06646803743153546729 -0.06646803743153546729 -0.4) // x -y -z
/* 10 */ ( 0.06646803743153546729 0.06646803743153546729 -0.4) // x y -z
/* 11 */ (-0.06646803743153546729 0.06646803743153546729 -0.4) // -x y -z
/* 12 */ (-0.06646803743153546729 -0.06646803743153546729 0.00) // -x -y z
/* 13 */ ( 0.06646803743153546729 -0.06646803743153546729 0.00) // x -y z
/* 14 */ ( 0.06646803743153546729 0.06646803743153546729 0.00) // x y z
/* 15 */ (-0.06646803743153546729 0.06646803743153546729 0.00) // -x y z
/* 16 */ (-0.11667261889578034153 -0.11667261889578034153 -0.4) // -x -y -z
/* 17 */ ( 0.11667261889578034153 -0.11667261889578034153 -0.4) // x -y -z
/* 18 */ ( 0.11667261889578034153 0.11667261889578034153 -0.4) // x y -z
/* 19 */ (-0.11667261889578034153 0.11667261889578034153 -0.4) // -x y -z
/* 20 */ (-0.11667261889578034153 -0.11667261889578034153 0.00) // -x -y z
/* 21 */ ( 0.11667261889578034153 -0.11667261889578034153 0.00) // x -y z
/* 22 */ ( 0.11667261889578034153 0.11667261889578034153 0.00) // x y z
/* 23 */ (-0.11667261889578034153 0.11667261889578034153 0.00) // -x y z
/* 24 */ ( -0.05 -0.05 0.110) // -x -y z
/* 25 */ ( 0.05 -0.05 0.110) // x -y z
/* 26 */ ( 0.05 0.05 0.110) // x y z
/* 27 */ ( -0.05 0.05 0.110) // -x y z
/* 28 */ (-0.06646803743153546729 -0.06646803743153546729 0.110) // -x -y z
/* 29 */ ( 0.06646803743153546729 -0.06646803743153546729 0.110) // x -y z
/* 30 */ ( 0.06646803743153546729 0.06646803743153546729 0.110) // x y z
/* 31 */ (-0.06646803743153546729 0.06646803743153546729 0.110) // -x y z
/* 32 */ (-0.11667261889578034153 -0.11667261889578034153 0.110) // -x -y z
/* 33 */ ( 0.11667261889578034153 -0.11667261889578034153 0.110) // x -y z
/* 34 */ ( 0.11667261889578034153 0.11667261889578034153 0.110) // x y z
/* 35 */ (-0.11667261889578034153 0.11667261889578034153 0.110) // -x y z
);
blocks
(
// first block - inlet pipe
hex ( 0 1 2 3 4 5 6 7) (40 40 40) simpleGrading (1 1 0.2)
hex ( 1 0 8 9 5 4 12 13) (40 8 40) simpleGrading (1 1.25 0.2)
hex ( 2 1 9 10 6 5 13 14) (40 8 40) simpleGrading (1 1.25 0.2)
hex ( 3 2 10 11 7 6 14 15) (40 8 40) simpleGrading (1 1.25 0.2)
hex ( 0 3 11 8 4 7 15 12) (40 8 40) simpleGrading (1 1.25 0.2)
hex ( 9 8 16 17 13 12 20 21) (40 14 40) simpleGrading (1 1.5 0.2)
hex (10 9 17 18 14 13 21 22) (40 14 40) simpleGrading (1 1.5 0.2)
hex (11 10 18 19 15 14 22 23) (40 14 40) simpleGrading (1 1.5 0.2)
hex ( 8 11 19 16 12 15 23 20) (40 14 40) simpleGrading (1 1.5 0.2)
// second block - rotor wheel
hex ( 4 5 6 7 24 25 26 27) (40 40 30) simpleGrading (1 1 1)
hex ( 5 4 12 13 25 24 28 29) (40 8 30) simpleGrading (1 1.25 1)
hex ( 6 5 13 14 26 25 29 30) (40 8 30) simpleGrading (1 1.25 1)
hex ( 7 6 14 15 27 26 30 31) (40 8 30) simpleGrading (1 1.25 1)
hex ( 4 7 15 12 24 27 31 28) (40 8 30) simpleGrading (1 1.25 1)
hex (13 12 20 21 29 28 32 33) (40 14 30) simpleGrading (1 1.5 1)
hex (14 13 21 22 30 29 33 34) (40 14 30) simpleGrading (1 1.5 1)
hex (15 14 22 23 31 30 34 35) (40 14 30) simpleGrading (1 1.5 1)
hex (12 15 23 20 28 31 35 32) (40 14 30) simpleGrading (1 1.5 1)
);
edges
(
// first block - inlet pipe
arc 0 1 ( 0.00 -0.06 -0.4) // 0+0
arc 1 2 ( 0.06 0.00 -0.4) // 1+0
arc 2 3 ( 0.00 0.06 -0.4) // 2+0
arc 3 0 (-0.06 0.00 -0.4) // 3+0
arc 4 5 ( 0.00 -0.06 0.00) // 4+0
arc 5 6 ( 0.06 0.00 0.00) // 5+0
arc 6 7 ( 0.00 0.06 0.00) // 6+0
arc 7 4 (-0.06 0.00 0.00) // 7+0
arc 8 9 ( 0.000 -0.094 -0.4) // 0+8
arc 9 10 ( 0.094 0.000 -0.4) // 1+8
arc 10 11 ( 0.000 0.094 -0.4) // 2+8
arc 11 8 (-0.094 0.000 -0.4) // 3+8
arc 12 13 ( 0.000 -0.094 0.00) // 4+8
arc 13 14 ( 0.094 0.000 0.00) // 5+8
arc 14 15 ( 0.000 0.094 0.00) // 6+8
arc 15 12 (-0.094 0.000 0.00) // 7+8
arc 16 17 ( 0.000 -0.165 -0.4) // 0+16
arc 17 18 ( 0.165 0.000 -0.4) // 1+16
arc 18 19 ( 0.000 0.165 -0.4) // 2+16
arc 19 16 (-0.165 0.000 -0.4) // 3+16
arc 20 21 ( 0.000 -0.165 0.00) // 4+16
arc 21 22 ( 0.165 0.000 0.00) // 5+16
arc 22 23 ( 0.000 0.165 0.00) // 6+16
arc 23 20 (-0.165 0.000 0.00) // 7+16
// second block - rotor wheel
arc 24 25 ( 0.00 -0.06 0.110) // 4+0
arc 25 26 ( 0.06 0.00 0.110) // 5+0
arc 26 27 ( 0.00 0.06 0.110) // 6+0
arc 27 24 (-0.06 0.00 0.110) // 7+0
arc 28 29 ( 0.000 -0.094 0.110) // 4+8
arc 29 30 ( 0.094 0.000 0.110) // 5+8
arc 30 31 ( 0.000 0.094 0.110) // 6+8
arc 31 28 (-0.094 0.000 0.110) // 7+8
arc 32 33 ( 0.000 -0.165 0.110) // 4+16
arc 33 34 ( 0.165 0.000 0.110) // 5+16
arc 34 35 ( 0.000 0.165 0.110) // 6+16
arc 35 32 (-0.165 0.000 0.110) // 7+16
);
boundary
(
);
mergePatchPairs
(
);
# blockMesh
Background mesh is very simple initial mesh used as an input for snappyHexMesh utility. You can view it in paraview:
# paraFoam
Figure: Rotor part defined by *.stl files and surrounding background mesh.
Next: Model setting without an Up: Alternative formulation Previous: Alternative formulation Contents Index