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Seems like a great resource for rocket engines.

Having a simulator to try these out would be very useful before trying anything practical. I'm sure it will be a complicated piece of code with heavy computation requirements

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Simulation and validation is a touch improved, when I did this in college we used Ansys supplemented with data from NASA's CEA (Chemical Equilibrium and Applications) utility for validation. Once you get the work flow figured out it's not terrible.

Simulating cooling channels//ablation for larger scale rockets is a major PTA though.

Combustion and fluide dynamics in a rocket engine are very complicated to simulate. I’m not a SpaceX fan but they have talk on that somewhere on yt.

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