Physical system simulation and optimization

Question

Can someone help me write a simulation of a two-stage rocket? It’s built from stacks of tanks of the same size, the engine thrust is dependent on air pressure, and the simulation is in a two-dimensional circular-planet approximation with a simple drag model.
The goal is to reach as close to orbit as possible with the least fuel possible.

Answer 1

You don't have to write it from scratch. All the relevant game engines (e.g. Unity, Unreal) have physics stimulators built in.