Different Mesh Types by Multigeometry Linking

1. Different Mesh Types by Multigeometry Linking

2. Introduction • Sometimes it is desirable to use different mesh types in different subdomains. • The prism and hex mesh can be useful when modeling very thin geometries. In this diffusion example, we are using a prism mesh in a thin curved channel and a hex-mesh in an adjacent rectangular thin substrate. • This is realized by creating two geometries with different mesh types and then linking them together with the “identity coupling variable”.

3. Geometry Thin curved channel in contact with a thin rectangular substrate of different diffusivity At the bottom of the substrate a surface reaction consumes the diffusing species Fixed concentration at the far end of the channel

4. Mesh Hex mesh in substrate (saves memory compared to tet-mesh for thin structures) Prism mesh in curved channel (saves memory, and is simpler to use than hex for geometries that are more complex than the straight mapping of a square)

5. Results