Calculation of flow and diffusion processes in gas centrifuges

The calculation of the flow and diffusion processes within high-velocity gas centrifuges is accomplished by numerically solving the rotation-symmetric conservation equations. The flow field, initially assumed to be homogeneous and ideal, is calculated within the realm of continuity by a numerical integration of the transient linear, or alternatively, non-linear Navier-Stokes equations in rotating systems. The solution of the system of equations is conducted by Beam and Warming's implicit non-iterative, cubically factored finite difference algorithm. The physical boundary conditions are implemented both explicitly and implicitly as a result of the improved stability characteristics when applying large temporal increments. (orig./HP)