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-   -   Physical and Chemical time scale in dieselEngineFoam (http://www.cfd-online.com/Forums/openfoam-solving/64001-physical-chemical-time-scale-dieselenginefoam.html)

arun April 27, 2009 00:19

Physical and Chemical time scale in dieselEngineFoam
 
Hi all,

From literature, the chemical time scale for auto-ignition in diesel engines is
around 1e-9, but setting the physical time step in dieselEngineFoam to this range is very time consuming for the 3-D simulation.

Therefore if larger physical time step such as 0.5 CAD equivalent to 5.2e-5 s (where the crank speed is 1600rpm) is set. Will this give significant difference in predicting the ignition delay period?


Thanks in advance.


Arun


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