The CounterFlowDiffusionFlame (CFDF) code is able to perform more general cases
of npflame_init for multiple species fuel and oxidizer streams. The
stoichiometric mixture fraction in the CFDF code uses the Bilger definition of
mixture fraction, using the conservation of elements C, H, and O. This method is
used in the python module, but not the MATLAB npflame_init function.
Also, the CFDF code uses the fuel stream density to calculate the fuel stream
velocity and the oxidizer stream density to calculate the oxidizer stream
velocity, where as the npflame_init code uses the fuel density for both velocity
calculations.
The elementMassFraction code is a MATLAB version of the python function:
elemental_mass_fraction, which is needed to run the CFDF code.
Update the diffflame.m example to use the more general CFDF function since the
input parameters are different than the npflame_init function. This example is
the same as the diffusion_flame.py sample in the Python module.
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