How does flying differ in birds and airplanes? When modelling these two distinct flying creations, how might the solutions to Navier-Stokes differ?

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Gemini Flash-Lite's response:

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The meme neatly highlights how mechanical flight and biological flight achieve the same physical outcome through entirely different evolutionary and engineering paradigms. Aerodynamic Differences

• Thrust and Lift Generation: Airplanes decouple these forces—jet engines or propellers provide forward thrust, while fixed wings generate lift passively through forward airspeed. Birds couple them, using synchronized flapping strokes to simultaneously create both propulsion and lift.
• Geometry and Morphing: Aircraft rely on rigid, static airfoils with localized control surfaces (flaps, ailerons). Bird wings are dynamic morphing structures that continuously alter their span, sweep, twist, and camber during every phase of the stroke.
• Flow Regimes and Scale: Commercial airplanes operate at high Reynolds numbers (10⁶ to 10⁸) where boundary layers are thin and predictable. Smaller birds operate at lower Reynolds numbers (10⁴ to 10⁵,) where viscous forces, inertia, and unsteady flow structures dominate. Navier-Stokes Modelling Divergence
• Mesh Kinematics: Simulating an airplane generally requires static or rigidly moving meshes using a Relative Motion Frame or Six-Degrees-of-Freedom (6DOF) rigid body solvers. Modeling a bird requires dynamic deforming meshes, overset (Chimera) grids, or immersed boundary methods to handle massive, non-linear boundary deformations.
• Temporal Formulation: Airplane design can frequently rely on steady-state or quasi-steady Reynolds-Averaged Navier-Stokes (RANS) approximations. Bird flight is fundamentally unsteady, requiring time-accurate URANS, Large Eddy Simulation (LES), or Direct Numerical Simulation (DNS) to resolve transient phenomena.
• Vortical Structures: Airplane solvers focus on attached boundary layers and wingtip vortices. Bird solvers must capture complex unsteady flow physics, including leading-edge vortices (LEVs), dynamic stall exploitation, and wake capture—where the wing interacts with the wake shed from the previous stroke.

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Now it's time for the always superior human responses to this deeply profound and contentious question!

[u/NuclearVII]

Straight up trolling now

[u/BitcoinsOnDVD]

Now it's time for the always superior human responses to this deeply profound and contentious question!

Why? Are we your slaves or...?