TURBULENCE AND NUMERICAL WIND TUNNELS

摘要: The possibility of computing realistic three-dimensional, unsteady fluid flows is considered. Particular attention paid to that might exist in wind-tunnel experiments at transonic Mach numbers and high Reynolds numbers. Portions such are essentially inviscid or have very low levels vorticity can be computed both efficiently reliably. object approach the problem those portions dominated by turbulence and, as a result, vorticity. An elementary study Navier-Stokes equations shows difficulties lie resolving effects nonlinear convective terms which thoroughly mix kinetic energy content flow through wide range length scales, forcing foreseeable finite-difference computations rely heavily on statistical properties, assumptions, and/or approximations least two space directions. attempt made examine various aspects modeling investigating some simple examples based analysis one- two-dimensional similar appearing equations, harmonic solutions with large spread wave Results for number, simulations found calculating full discussed. Finally, recent experience simulation called upon predict future challenges opportunities numerical possible computer designs capabilities.