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May 8, 2012, 12:58 |
Ugly mesh around cylinder
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#1 |
Member
Join Date: Dec 2011
Location: State College, PA
Posts: 87
Rep Power: 14 |
I can't seem to get a nice looking mesh around a cylinder I'm modeling. See picture below. The cylinder goes perpendicular to the screen. The flow is in the same direction. This is a cross-sectional shot of the cylinder in the flow field. I don't see why I can't get the prism layer to be nice consistent squares around the cylinder. Why does the trim mesh have so many non-square funky looking cells?
Here's the mesh portion of the summary report if that helps: Code:
| +-1 Mesh 1 Verbose Output false | | | OOC translation false | | | Per-Region Meshing false | | | Use Parallel Meshing false | | | Interpolation Option Nearest neighbor | | | Interfaces [] | | | Regions [Body 1] | | +-1 Models | | | +-1 Prism Layer Mesher Stretching Function Geometric Progression | | | | Stretching Mode Stretch Factor | | | | Gap Fill Percentage 49.0 | | | | Minimum Thickness Percentage 10.0 | | | | Layer Reduction Percentage 10.0 | | | | Boundary March Angle 50.0 | | | | Concave Angle Limit 0.0 | | | | Convex Angle Limit 360.0 | | | | Near Core Layer Aspect Ratio 0.0 | | | | Generate Standard Cells Only false | | | | Improve Subsurface Quality true | | | +-2 Surface Remesher Do curvature refinement true | | | | Do proximity refinement true | | | | Do compatibility refinement false | | | | Retain geometric features true | | | | Create aligned meshes true | | | | Minimum face quality 0.05 | | | | Enable automatic surface repair true | | | `-3 Trimmer Coordinate System Laboratory | | | Do mesh alignment false | | | Template mesh type Hexahedra | | | Template mesh growth type Simple | | | Run Optimizer true | | +-2 Reference Values | | | +-1 Base Size Value 0.05 m | | | +-2 Automatic Surface Repair Connected surface count limit None | | | | | Connected surface size limits None | | | | +-1 Minimum Proximity Minimum Proximity 0.05 | | | | `-2 Minimum Quality Minimum Quality 0.01 | | | +-3 CAD Projection Project to CAD true | | | +-4 Maximum Cell Size Size type Relative to base | | | | `-1 Relative Size Percentage of Base 10000.0 | | | | Absolute Size 5.0 m | | | +-5 Number of Prism Layers Number of Prism Layers 1 | | | +-6 Prism Layer Stretching Prism Layer Stretching 1.5 | | | +-7 Prism Layer Thickness Size type Relative to base | | | | `-1 Relative Size Percentage of Base 1.0 | | | | Absolute Size 5.0E-4 m | | | +-8 Surface Curvature Enable curvature deviation distance false | | | | `-1 Basic Curvature # Pts/circle 36.0 | | | +-9 Surface Growth Rate Surface Growth Rate 1.3 | | | +-10 Surface Proximity # Points in gap 2.0 | | | | Search Floor 0.0 m | | | +-11 Surface Size Relative/Absolute Relative to base | | | | | Size Method Min and Target | | | | +-1 Relative Minimum Size Percentage of Base 1.0 | | | | | Absolute Size 5.0E-4 m | | | | `-2 Relative Target Size Percentage of Base 10.0 | | | | Absolute Size 0.0050 m | | | `-12 Template Growth Rate Default Growth Rate Medium | | | Boundary Growth Rate Medium | | `-3 Volumetric Controls |
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May 8, 2012, 14:59 |
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#2 |
Member
Paul Hancock
Join Date: Mar 2009
Location: Bellingham, WA
Posts: 31
Rep Power: 17 |
My guess is that you're cutting plane is located on a plane of cell faces. Try moving your section location just a bit. Your problem might be just a visualization issue.
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May 8, 2012, 15:03 |
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#3 |
Member
Join Date: Dec 2011
Location: State College, PA
Posts: 87
Rep Power: 14 |
I also thought that, but when I moved the plane, the mesh looks almost the same. I didn't mention that the cross-sectional area doesn't change at all. The cylinder and flow section dimensions are constant moving in the z-direction (in and out of the screen). So I don't see why mesh cell dimensions and cross-sectional area should change in the z-direction. At least, I don't want it to be changing in the z-direction.
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May 8, 2012, 17:11 |
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#4 |
Member
Ryan Coe
Join Date: Jun 2010
Location: Albuquerque, NM
Posts: 98
Rep Power: 16 |
Meshing a circular cylinder with cubes will inherently result in misshapen cells.
Alternatively, you could use a cylindrical mesh (gridgen and pointwise can do this, but Star-CCM+ cannot). Within Star-CCM+, you could try the polyhedral mesh...
__________________
Ryan |
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May 9, 2012, 15:35 |
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#5 |
Member
Join Date: Dec 2011
Location: State College, PA
Posts: 87
Rep Power: 14 |
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Tags |
cylinders, starccm+, trimmer |
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