The next release of the Caedium CFD software system will provide an option to automatically convert a RANS Flow volume mesh to a polyhedral mesh - also known as a dual mesh. Solving the RANS equations on the dual mesh compared to the equivalent tetrahedral mesh typically leads to higher accuracy results with both faster and more reliable convergence.

Polygon Surface Mesh

Triangle Surface Mesh

Converting a tetrahedral mesh to a dual mesh will:

• Reduce the number of volume elements
• Increase the size of each volume element
• Increase the number of faces (cell neighbors) per volume element

Polyhedral Volume Mesh Slice

Tetrahedral Volume Mesh Slice

The increased element size and increased number of neighbors per element proves to be a significant benefit. If you compare the results from a tetrahedral mesh to the results from a dual mesh with the same number of cells, then the dual mesh will in general:

• Converge faster with fewer iterations
• Converge more reliably to lower residual values
• Produce results with higher accuracy