Is Simulation can be achievable in Appian? Is so, how it can be?...

Please further explain your use case.

Also checkout: forum.appian.com/.../summary

1. A simple use case: To run a process with necessary test data for all test cases whenever a new version is published, without manual intervention?
2. To run, say for example 1000 instances, when user require it. that is running a process for 1000 different data at a time.