Is the reason for the two fatal 737 Max accidents a flaw in the design of the airplane, making it prone to stall (compare with this post), which was compensated by a possibly over-reacting control system, which the pilots could not turn off? Did FAA authorise the plane without proper safety evaluation? Questions are piling up: FBI is joining criminal investigation, Wikipedia, Boeing, New York Times, Pilot training, Stability, Aviation expert, Kludge, Aviationcv, Pilots view.
Computational software used by developers of airplanes do not seem to allow simulation of the dynamics of stall and so the impact of stall on aircraft design and safety assessment must be done solely by expensive and time-consuming experiments in flight, and then also the design of the apparently needed control system. This may show to have been insufficient to make the plane safe, something which FAA did not have the capacity to check.
With our New Theory of Flight and new technology of Automated Computational Mathematical Modeling presented on this site (some references also collected here), the full flight of an airplane, like the 737 Max, including the full dynamics of stall, can accurately be computationally simulated as a unique capability shown in the HighLiftPW-3 Workshop, see also front page of Icarus Simulation. Such advanced technology could allow airplane makers better and faster simulations to design aircraft and assess their safety.
The draft of the book The Secret of Flight is now under revision into completion for final publishing. Suggestions for publisher are welcome! The revised version will in particular include recent results presented at the High Lift Prediction Workshop III (see previous post) and new analysis of the critical phenomenon of stall: see movie.
As one of 40 teams competing at High-Lift Prediction Workshop III, Hoffman-Jansson-Johnson showed for the first time computational simulation of full time-dependent turbulent flow around a jumbo-jet in full landing configuration, including the following unique features:
- automatic turbulence simulation
- automatic adaptive error control
- computational efficiency
- superb agreement with experiment including stall
as the overall best result. The flow simulator by HJJ opens the possibility of constructing a first real flight simulator based on the real physics of turbulent air flow. Such a simulator will open to new forms of realistic pilot training of e.g. take-off and landing of a jumbo-jet under severe wind conditions or machine failure.
This ground breaking work is presented here.
Also: The Future in CFD is Already Here.
Our New Theory of Flight (together with Johan Hoffman and Johan Jansson) has now been published in Journal of Mathematical Fluid Mechanics (online behind paywall and free originally submitted (2012) preprint) .
New Theory of Flight springs from our resolution of d’Alembert’s paradox formulated in 1755, published in JMFM 2008, and shows for the first time that both simulation and understanding of the miracle of flight is possible with present computer and brain power. As such it has every chance of becoming a landmark article.
New Theory of Flight is published by JMFM with a special Editors Foreword inviting scientists, mathematicians and engineers to scrutiny and discussion.