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on the definition of Start in shell autoignition

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Old   June 18, 2008, 10:33
Default on the definition of Start in shell autoignition
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Hi all,

I found this in starcd users guide:

Start, End â€" Ignition starting and finishing time or time step no., depending on the When? menu setting. Use a realistic value, e.g. the start of ignition, for the Start time but set the Finish time to a large number, so that ignition cut-off may be controlled solely by the limiting values specified above.

I can quite understand the realistic value of start of ingnition for spark ignition. But how do we define the ignition start of a compression ignition case then?

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