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Twin box bridge deck meshing

Applied CCM are the distributors of Pointwise in Australia and New Zealand. This is the second in a series of meshing articles you will see from us in 2019. February’s mesh showcases twin-box decks of a bridge on a Pointwise mesh. Examples of bridges that adopt twin-box deck arrangements are:  Yi Sun-sin suspension bridge located in South Korea, the Xihoumen suspension bridge located in China, and the Stonecutters cable-stayed bridge situated in Hong Kong.

Further understanding of the aerodynamics and aeroelastic performance under a wide range of scenarios, suppress the vortex-induced vibration (VIV) while increasing the efficiencies of the flutter response. A high quality mesh is critical to perform an aerodynamic analysis with computational fluid dynamics (CFD). 

Stonecutters cable bridge in Hong Kong.
Stonecutters cable bridge in Hong Kong, showing dual-box structure.

The computational domain (shown in Figure 1) is subdivided into 3 different zones. The first zone closest to the boxes, is the buffer zone. Care was taken to obtain a high-density mesh, in the gap between decks.

Figure 1 – Mesh details of the computational domain showing the unstructured quadrilateral grids on the far-field boundary.

Zone 2, a strip downwind of the buffer zone, termed the wake zone. The evolution of vortices shed from the deck dissipates as they drift away (Figures 2 and 3).

Figure 2 Mesh details of the wake buffer and wake zones.
Figure 2 Mesh details of the wake buffer and wake zones.
 Mesh details of the wake buffer region
 Figure 3 Mesh details of the wake buffer region

The far-field zone represents the overall size of the fluid domain. This was sufficient to avoid the influence of boundaries on the solution. Except for the boundary layer region, an unstructured quadrilateral grid was locally defined and orthogonality was employed. This region utilised a structured quadrilateral structured mesh (Figures 4-6).

Figure 4  Mesh details of the wake and gap regions
Figure 4  Mesh details of the wake and gap regions
Figure 5  Mesh details showing the gap detail
Figure 5  Mesh details showing the gap detail
Figure 6 Boundary layer around the deck.

Check out last month’s mesh if you missed it!

Thanks for reading, the next edition will be March 2019. Until then, happy meshing!

For a free trial of Pointwise, go here.

This work was undertaken by Dr. Robert Ong, of Applied CCM.

Monthly Mesh
1. Cricket bat meshing
2. Twin box bridge deck meshing
3. Golf Driver Meshing
4. Frigate Helipad Pointwise unstructured mesh
5. Frigate Helipad – Structured O-H mesh
6. Horizontal wind turbine near a bridge
7. Meshing a Raspberry Pi
8. Scripting Pointwise Meshing
9. 2D meshing with sources in Pointwise
10. Pointwise as a Pre-processor for CFD
11. Mesh Adaption with Caelus and Pointwise
12. Meshing Santa’s Pod Racer Sled
13. Scripting Structured-Unstructured Meshes for Aerospace
14. Mesh Adaptation With Pointwise, Caelus & Python
15. Normal Extrusion Hybrid Meshes for Multi-Element Airfoils
16. Car park Ventilation CFD with Pointwise, Caelus, CFX and FDS
17. Mesh Independence for Car Park Ventilation
18. It’s all in the numbering – mesh renumbering may improve simulation speed
19. Voxel Transition Cell Recombination for OpenFOAM meshes
20. Meshing Santa’s Hat
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