A deterministic theoretical model that simulates the developmental process of the human brain is proposed. Observations of the development of the human brain with a high-speed camera show that the bones of the skull become increasingly larger over the neck, and that a lot of soup-like fluid for generating brain cells enters the skull from the body. This process is essentially similar to the intake process of an internal combustion engine, because the volume of the engine's cylinder, which increases according to the descent of the piston, geometrically corresponds to the development of the skull, and also because the human neck resembles the intake port that serves as the throat of the engine. A higher-order numerical computation of the Navier-Stokes equation reveals the similarity between the convexoconcave forms inside the brain and the flow structure in the internal combustion engine. We will show that the present computation also simulates the emergence of the eyeballs. Finally, we will clarify the reason why cerebral development is strongly influenced by fluid dynamics.
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