Session 25

Introduction
Share Topology in SpaceClaim is a highly practical feature that directly influences how your mesh is generated. In essence, Share Topology is a geometric operation that makes adjacent bodies share the same faces and edges at their contact interfaces. When applied, the mesh on both sides of the interface becomes conformal, meaning the nodes match exactly across the shared boundary.

Objectives
To clearly demonstrate how Share Topology works, we will build a simple geometry and mesh it in two different scenarios. In the first case, we apply Share Topology before meshing; in the second case, we mesh the same geometry without using this command. Without Share Topology, the inner and outer regions do not share nodes, resulting in a non‑conformal interface where the two meshes remain independent. With Share Topology, the interface faces are shared, nodes align perfectly across the boundary, and the result is a single, continuous, fully conformal mesh over the entire geometry.

Summary
Generating a conformal mesh is essential for many CFD simulations, as it ensures solution continuity across shared interfaces. SpaceClaim’s Share Topology is therefore a key tool, providing the main mechanism to create such meshes. In this session, the aim was to show different ways of handling shared geometry and to illustrate how applying or omitting Share Topology changes the structure and quality of the final mesh.