Mosaic Meshing Technology
Accuracy and solution time are critical concerns in computational fluid dynamics (CFD) simulations, and both are highly dependent on the characteristics of the mesh. Different types of meshing elements are needed to resolve various geometries and flow regimes. Transitioning between different types of elements, however, has been a challenge. The transition zone has typically relied on nonconformal interfaces or on tetrahedra, but these create issues regarding mesh quality and excessive cell count. As a result, engineers have had to compromise on a common element type to minimize mesh transitions.
ANSYS Mosaic technology greatly improves upon this by automatically connecting different types of meshes with general polyhedral elements. Mosaic mesh-connecting technology has the potential to deliver exciting new combinations of meshing elements for solving increasingly complex parts with greater accuracy and speed.
The new Poly-Hexcore feature in ANSYS Fluent uses this technology to fill the bulk region with octree hexes, maintain a high-quality, layered polyprism mesh in the boundary layer and conformally connect the two meshes with general polyhedral elements.
The following example shows a comparison between Poly-Hexcore with Mosaic technology and conventional all-polyhedral meshing technology with a bluff body flame holder. The Mosaic mesh had fewer, better quality cells, requiring one-third less memory, and delivered a solution two-times faster with higher accuracy.