Learning Forum

[shailesh.singh.pg24]

Hi everyone,

I am trying to run a parametric study on a Pin-Fin Heat Sink in Ansys Workbench 2024 R1 (Fluid Flow Fluent system). My goal is to vary the Fin Angle and Fin Count as input parameters.

I am using SpaceClaim for geometry and Ansys Meshing, but I am hitting two major roadblocks when the parameters update.

1. The "Overlapping Geometry" Error I have a solid Heat Sink (Pin Fins) inside a fluid Enclosure.

• In SpaceClaim, I subtract the fins from the fluid domain to create the mesh interface.

• However, when I change the Fin Angle parameter in Workbench, the geometry updates, but the boolean subtraction does not seem to "refresh" correctly.

• The new rotated fins clash with the old fluid voids, leading to an "Overlapping Geometry" error in Ansys Meshing, preventing the mesh from generating.

• Question: How do I ensure the boolean subtraction (Fluid minus Solid) re-calculates automatically for every design point without me having to manually open SpaceClaim every time?

2. Named Selections Breaking (Face IDs Changing) Because the geometry is re-drawn at new angles, the Face IDs change, causing my manual Named Selections (Inlet, Outlet, Fin_Walls) to fail or become empty.

• I attempted to use Worksheet Named Selections to select faces by criteria (e.g., Location Y or Size).

• While this works for simple things, I am struggling to robustly distinguish the "Base Plate Top Floor" (the flat face between fins) from the "Side Walls" of the base plate, since they are close in proximity.

• Question: Is there a standard Worksheet recipe or a better method (maybe SpaceClaim Groups?) to robustly tag these specific faces so they survive a topology change?

Current Workflow:

1. SpaceClaim: Create Fins + Enclosure.

2. Workbench: Define Parameters (Angle).

3. Meshing: Standard meshing with Named Selections.

Any advice on the correct workflow for parametric geometry updates involving boolean operations would be greatly appreciated!

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