Evolutionary design theory using dynamic variation and thermodynamic selection

Abstract

A general evolutionary design theory is presented which incorporates variation processes and selection processes to design fluid/thermal/chemical devices. A biologically consistent view of evolution splits the process into variation and selection. The variation process is quantitatively modeled using dynamic equations that govern structural changes. Steady-state and stability of design variation is related to growth and decay factors and environmental control parameters. The selection process is quantitatively modeled using nonequilibrium thermodynamics to indicate performance. Both structure and environment contribute to entropy production. This requires computational modeling of fluid dynamics, heat transfer, chemical diffusion, and reactions. Special cases of engineering design evolution are shown theoretically and with a numerical example. The theory could rectify the impact of engineered structures on the natural environment and provide a basis for designing machines with coupled physics. © 1991 Springer-Verlag New York Inc.