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Suppose I want to train butterfly robot with reinforcement learning. So I need physically correct simulation of aerodynamics and material physics (because butterfly wings should bend etc). Also I physical correctness is more important that speed, so I can leave limulation to work slowly, no need for real time. Also I need GPU usage.
Which software system I need for this like Gazebo, Unreal etc?
Unreal, Unity and other game engines, Gazebo, Mujoco and other Physics engines are good at simulating multi body dynamics. There is no deep conceptual difference between them. You can use whichever you prefer.
Flying is not only multi body dynamics but also fluid dynamics. This is extremely hard to simulate accurately. It is usually done with CFD (Computational Fluid Dynamics). An open source variant for CFD is OpenFoam.
You can create a simplified version, which you can implement in a muli-body dynamics engine and you can create an even more simplified version and write the simplified equations for it.
Depending on the level of accuracy you need, you can choose your simulation. I would recommend starting simple and increasing complexity gradually.
