My momentum source (Fan model 1) isn’t working because SimScale can’t detect proper interference between Part 3 (my actuator disk) and the flow region. For momentum sources to function, the actuator disk must physically overlap or intersect with the flow region as separate bodies - this interference is how SimScale applies the momentum effect within the domain. The error “Found 1 body only assigned to advanced concepts and not interfering with any body assigned to a material” means Part 3 appears geometrically isolated from your flow region, even though it looks positioned correctly in your 3D view. This is typically a geometry detection issue where the overlap isn’t being recognized properly by the meshing algorithm.
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