Simulation and Modelling > Introduction > Simulation: Time Advance Mechanism

 Time Advance Mechanism: A Simulation clock can be used that starts at any time like a stopwatch and variables that keeps the current value of  state of the model. Two approaches for time advance:

1. Next event time advances: It is called discrete event simulation (DES) model. Next event time advances mechanism estimates the time of futuristic events that are going to happen on the basis of a list of events.

Steps of DES:

1. Keep an initial event list
2. Initialize simulation clock to 0
3. Determine the times of occurrence of future events 
4. Clock advances to the most imminent of these future events
5. When an event occured at a point time the state of the system is updated 
6. Event execution may involve updating event list
7. Then the simulation clock is advanced to the time of the new most imminent event
8. Continue until stopping rule is satisfied (must be explicitly stated)

N.B. Clock jumps from one event time to the next, and doesn’t “exist” for times between successive events
Periods of inactivity are ignored

2. Fixed increment time advances: Simulation clock is advanced in increments of exactly ∆t time units. After each update of the clock, a check is made to determine if any events should have occurred during the previous interval of length ∆t.

 

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