Defining function for exhaust mass flow rate

[Sourav BasuParticipant @souravbasu42502]

For a 4 stroke engine, 1st 3 strokes there will be no mass flow from exhaust port. And during the exhaust stroke there will be mass flowing . Now my question is

, how is the mass flow pattern during the 4th stroke through exhaust port?

Which is most suitable assumption
1) mass flow constant
2) max at begining and 0 at the end of 4 th stroke?

Or any other suggestions

[Sourav BasuParticipant @souravbasu42502]

Hii friends, I’m doing a CFD analysis on automobile mufflers, here I want to model the function which defines transient mass flow phenomenon.

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