Domain Decomposition Method
The domain decomposition method (DDM), available only for ANSYS HFSS, distributes a simulation across multiple, potentially networked cores to solve larger and more complex problems. This method is primarily designed to tackle larger problem size with the distributed nature of the solution. It also provides results in shorter solution times.
DDM generates a continuous finite element mesh over the entire structure, then subdivides that mesh and uses a distributed-memory parallel technique to distribute the solution for each mesh subdomain to a network of processors. This substantially increases simulation capacity. Domain decomposition is highly scalable to large numbers of processors and takes advantage of multithreading within the mesh subdomains to reduce solution times for individual subdomains.
Periodic Domain Decomposition
The periodic domain decomposition method available for HFSS uses a distributed-memory parallel technique for finite periodic geometries such as antenna arrays. This method distributes unit cell mesh subdomains to a network of processors and RAM while an industry-standard MPI maintains communications between domains. Simulation capacity and speed are substantially increased by re-using the adaptive mesh from a single unit cell for a large finite periodic structure and processing the duplicated unit cells across a large number of processors. This method combines with multithreading to provide faster solves for each of the individual subdomains. The automated generation of domains makes this method easy to learn and implement.
Hybrid Domain Decomposition Method
The hybrid domain decomposition method uses the domain decomposition method on models consisting of finite element (FEM) and IE domains. The HFSS integral equation (IE) solver add-on makes it possible to create HFSS models that use a hybrid FEM–IE methodology to solve large EM problems. This methodology provides the best of two powerful techniques: the finite element method’s ability to handle complex geometries plus the method of moments (MoM) direct calculation of the free-space Green's function, which leads to accurate radiating and scattering solutions. The hybrid domain decomposition method significantly increases simulation capacity by using the distributed memory parallel technique to distribute the matrix solution to a network of processors and RAM.