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Oppdif is a Fortran program that computes the one-dimensional, axisymmetric diffusion flame between two opposing nozzles. A similarity transformation reduces the two-dimensional axisymmetric flow field to a one-dimensional problem. Assuming that the radial component of velocity is linear in radius, the dependent variables become functions of the axial direction only. Oppdif solves for the temperature, species mass fractions, normal and radial velocities, and radial pressure gradient, which is an eigenvalue in the problem. The Twopnt software solves the two-point boundary value problem for the steady-state form of the discretized equations. The Chemkin package evaluates chemical reaction rates and thermodynamic and transport properties.

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