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Development of FVTD Based RCS Prediction code on Unstructured Mesh

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Zeus Numerix has initiated the efforts towards incorporating capability of handling unstructured meshes to its proprietary FVTD based RCS prediction solver. This will eliminate the large manual work involved in generating structured meshes. Structured meshing for complex aerospace configuration becomes too complicated & current software will enable users to solve full aircrafts with their minute details.

Work involved implementation of the numerical schemes, previously implemented for structured meshes. The code has been validated for RCS prediction over canonical shapes. It was found that usage of unstructured mesh increases the number of grid point requirement compared to those required with structured mesh. Therefore, solver data structure was designed to be massively parallelizable. So far, it has been tested for scalability upto 128 cores. Other features such that polyhedral grids, storage of large grids in linked files, partitioning of mesh are also present in the current version of code.

Illustration
Surface current on almond with cavity configuration solved (fine unstructured mesh seen for 2GHz)

Current activities include validation of ABC (Absorbing Boundary Condition) & PML (Perfectly Matched Layer) boundary conditions. Scalability of the solver is being established for meshes upto 200 million tetrahedrons. Next release of solver will incorporate handling of dielectric materials.

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