Hi there, your current model looks just fine, proceed to the following steps:
- Deactivate the ‘physics-based meshing’ option in the mesh tab
- Set solid 1 as a Cell zone
Check my mesh here: https://www.simscale.com/workbench/?pid=4126709855677813309&mi=spec%3A92b09f00-3022-47f3-a74c-c3a5396ffe06%2Cservice%3AMESHING%2Cstrategy%3A16&sh=11
Keep in mind that no-slip walls means that the domain is modeled as a solid boundary.
Best regards,
Fillia