Using time-step analysis to simulate Scheils equation

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Krikor Hagopian
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Using excel, I tried to do a numerical analysis to get the same results as scheils equation. The problem is that the two concentration profiles start diverging at the end. The numerical analysis is offcourse based on time-step analysis.

I have uploaded the excel file.

Much Gratitude,
 

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Its going to take too much time to try and reverse engineer your excel file.
How are you going about your numerical analysis, which columns are being plotted? It looks like the data diverges after the first 50 points or so, sharing only the first point in common.
Based off of the graph your problem probably lies in a denominator getting really big; check for any exponents that are negative and try to verify that your implementation of the Scheils equation is correct.