Discontinuous Mesh and Geometry Parts

Use domain connectivity (discontinuous Galerkin domain decomposition method) to “connect” a static mesh to a dynamic parameterised geometry without requiring node connectivity. The parts may be separated by a small gap.

Note: Mesh connectivity between parts is achieved only when the parts have a common interface with shared vertices (a continuous mesh).
A simulation model is often assembled from different parts. For example, a car model meshed using Altair HyperWorks and imported into CADFEKO. An antenna geometry is then placed on the imported mesh. To avoid re-meshing the full model to align the vertices on the common interface, the domain connectivity approach can be used to “connect” the discontinuous mesh and geometry parts.

Figure 1. Left: Mesh parts that have no mesh connectivity (triangles do not share vertices on a common interface); Right: Mesh parts that have mesh connectivity.
Apply the domain connectivity to discontinuous meshes where the gap between the meshes is small in relation to the wavelength. For high accuracy, choose the gap distance g as g = λ/ 1000. Increasing the gap distance, the result becomes less accurate and margins g > λ /100 should be avoided.

Figure 2. Left: Mesh parts that have mesh connectivity; Center: Mesh parts that do not have mesh connectivity but have domain connectivity defined; Right: Mesh parts that have no mesh connectivity.