18 May, 2009
Simulation of RCS at high frequency with 1 Billion mesh points
In its endeavor to push the frontiers of technology ZN created a grid of One Billion mesh points for simulation of RADAR Cross Section (RCS) of a missile. The size of the missile was nearly 1.3m with a diameter of 0.34 m. Simulation of RCS was done for a frequency of 10GHz in the X Band. Simulation was done for the broadside illumination of the missile.

The grid generated was a multi-block structured grid with 544 surfaces and 30 points per wavelength in all directions. This resulted in 1439968 surface points and 5504 blocks. Total number of grid points is 1.078 Billion. Grid was made keeping in consideration the quality of mesh from the point of view of RCS simulations.

Since the size of the grid was very large, simulation was done on PARAM Yuva, the latest high performance computing facility inaugurated by Centre for Development of Advanced Computing (C-DAC). A total of 2048 CPUs were engaged to perform the simulation and it took approximately four hours to get a converged solution.

Challenges in simulation: Grid generation was a major challenge in this case as the grid size was orders of magnitude bigger than the sizes that are normally handled by workstations. Topology planning and quality control was an issue that was resolved. The CEM code (EMWaveZ) was parallelized to redistribute itself in multiple CPUs.

With successful completion of the validation exercise, work has already begun on enhancing the capability of the solver and other related softwares such as the grid generator. Grid of size 4.2 billion mesh points have already been created as a first step towards this work.

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