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RANSMB simulation
RANSMB is a BAE Systems developed computational fluid dynamics (CFD) code for solving the Reynolds-Averaged Navier-Stokes equations. The code allows efficient, high-fidelity computation of viscous flowfields around complex configurations. Depending on the types of flow required to be examined, RANSMB can be run in EULER (non-viscous), laminar or fully-turbulent modes.
A variety of turbulence models are available for use. The flow equations are solved over the global domain which has been discretized via the so-called structured Multiblock approach. This technique sub-divides the domain into a number of sub-regions called blocks. A structured grid, created in each block, consists of hexahedral cells arranged in ordered I,J,K directions.
The ATC has an extensive history of applying RANSMB to a wide range of configurations. Application of this type of code requires considerable experience both in setting up the problem (i.e. Structured, multi-block flow solutions have been used to examine the aerodynamic characteristics of a variety of projectile and weapon configurations and concepts across a wide range of Mach numbers, grid generation or the discretization of the flowfield) and in running and assessing the results.
It is well known that the grid generation processes for CFD, particularly structured grids, can be time-consuming and expensive. The many years of experience within the ATC enable this to be minimized as far as possible with the utilization of the BAE Systems Multiblock Suite and other grid generation software. Commercial structured, grid generation packages are currently being evaluated to further improve our processes.
