Issue with advanced concepts and parts

Project Support
1

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.

image
image1009×1098 53.7 KB

Please Help, Project

2

It might help if you change your solver to linear as well as changing the material of body one as it might not be able to comprehend air on air simulations as it may have interpreted body one model as air

3

Hello @ansh_mishra202 !

I’m happy to help you with this momentum source issue. You’ve correctly identified the problem—the error message indicates that your actuator disk (Part 3) isn’t physically interfering with the flow region, which is a requirement for the momentum source to be applied correctly.

Here are a few common ways to resolve this:

1. Create an Explicit Overlap in your CAD Software

The most straightforward solution is to modify your CAD model to ensure the actuator disk and the flow region physically overlap. You can do this by slightly enlarging the actuator disk or moving it to create a clear intersection. When you re-import the geometry into SimScale, the meshing algorithm should then be able to detect the interference.

2. Use a Geometry Primitive in SimScale

Instead of using an imported CAD part for your actuator disk, you can create a geometry primitive (e.g., a cylinder or Cartesian box) directly in SimScale. This approach is often more robust and can help avoid geometry detection issues.

Here’s how you can do it:

In the SimScale Workbench, go to the “Geometry” tab.
Click on the “Create new geometry” button and select “Geometry Primitives”.
Choose the appropriate primitive (a “Cylinder” is usually best for a fan) and define its dimensions and position so that it overlaps with your flow region.
Once the primitive is created, you can assign the momentum source to this new body.

For more details on this, please see the SimScale documentation on Momentum Sources.

3. Ensure the Actuator Disk is a Solid Body

When importing your geometry, ensure that the actuator disk is recognized as a solid body in SimScale. If it’s imported as a surface, it won’t be able to interfere with the flow region correctly. One way to ensure this is to create the actuator disk as a separate, solid part in your CAD software before importing it.

I recommend trying the geometry primitive approach first, as it’s often the quickest and most reliable way to solve this type of issue.

I hope this helps you get your simulation up and running. Please let us know if you have any other questions