I dont know the answer. But as a former physics major, I think those problems happen when underlying models have subtle differences from the real world. In thi

I dont know the answer. But as a former physics major, I think those problems happen when underlying models have subtle differences from the real world. In this case, the model assumes infinitely compressible fluid. The model may work out well in some earlier applications. But the model breaks down due to air is not "infinitely compressible" in the real world. The good thing for mathematics and computations is both are rigorous so they are perfectly well suited for spotting bad assumptions in models. And this is the reason we need well crafted experiments to hold theories against the real world.