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Dynamic Mesh Adaption

• Dynamic mesh adaption on unstructured grids is a powerful tool for computing unsteady 3D problems that require grid modifications to efficiently resolve solution features.

• By locally refining and coarsening the mesh to capture flowfield phenomena of interest, such procedures make standard computational methods more cost effective.

• For example, Fluent adapts the mesh based on:

- Gradients of flow or user-defined variables.

- Isovalues of flow or user-defined variables.

- All cells on a boundary.

- All cells in a region.

- Cell volumes or volume changes.

- y+ (see below for the definition of y+) in cells adjacent to walls.

• For flow-aligned geometries, quad/hex meshes can provide higher-quality solutions with fewer cells/nodes than a comparable tri/tet mesh

- Quad/Hex meshes show reduced numerical diffusion when the mesh is aligned with the flow.

- It does require more effort to generate a quad/hex mesh

• Meshing tools designed for a specific application can streamline the process of creating a quad/hex mesh for some geometries.

• For complex geometries, quad/hex meshes show no numerical advantage, and you can save meshing effort by using a tri/tet mesh or hybrid mesh

- Quick to generate

- Flow is generally not aligned with the mesh

• Hybrid meshes typically combine tri/tet elements with other elements in selected Regions

- For example, use wedge/prism elements to resolve boundary layers

- More efficient and accurate than tri/tet alone

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