CHT Interface Conformality & Setup Mistakes
Video topic: the geometric/interface mistakes that break a CHT case before the physics even gets a chance — fluid-volume extraction, conformal interfaces, and imprinting.
Talking points:
- The #1 CHT setup mistake — forgetting to extract the fluid volume as its own solid body, which silently assigns boundary conditions to the wrong domain (solid instead of fluid). (SimScale blog)
- Imprinting — splitting touching-body surfaces so contacting solids/fluids share congruent faces, which is what makes conduction/convection coupling at the interface correct in the first place. (SimScale blog + docs)
- Conformality in OpenFOAM's chtMultiRegionFoam — fluid-solid interface faces must be conformal or heat-flux conservation breaks across the boundary. (CloudHPC)
- Conformal (1:1) vs. GGI meshing — a matched mesh at the interface can actually hurt the solution in some cases; know when each approach is appropriate. (Ansys forum)
- Explicit conformality checks — verifying vertices/faces actually match between fluid and solid regions before solving, rather than assuming the mesher got it right. (CloudHPC)
Sources: