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.

Domain Decomposition

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.

The domain decomposition method uses a distributed memory parallel technique to distribute mesh subdomains to a network of processors. This significantly increases simulation capacity.

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.

Periodic Domain Decomposition is an efficient solution for creating geometries like finite antenna arrays.

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.

Hybrid domain decomposition accelerates the HFSS hybrid solving technique in which each domain can be defined as integral equation or finite element. This significantly increases simulation capacity.