Editing FlightGear (section)

===== YASim =====
YASim's approach to flight dynamics uses the geometry of the aircraft present in the 3D model at startup, conceptually similar to [[Blade element theory]] used by some software, to calculate a rough approximation of fluid dynamics - with the conceptual problems that each "element" is considered in isolation therefore missing affecting fluid flow to other elements, and the approximation breaking down for craft in [[Mach number#Classification of Mach regimes|transonic to hypersonic regimes]].<ref>{{Cite web|last=Neely|first=Gary|date=|title=What is YASim?|url=http://www.buckarooshangar.com/flightgear/yasimtut_introduction.html|url-status=live|archive-url=https://web.archive.org/web/20190902085249/http://www.buckarooshangar.com/flightgear/yasimtut_introduction.html|archive-date=2019-09-02|access-date=2019-09-02|website=www.buckarooshangar.com}}</ref> By contrast, offline approaches like JSBSim can incorporate [[Wind tunnel|windtunnel]] data. They can also incorporate the results of [[computational fluid dynamics]] which can reach computable accuracy only [[Numerical methods in fluid mechanics|limited]] by the nature of the problem and present day [[Supercomputer#Performance measurement|computational resources]].

''FlightGear'' also supports LaRCsim and UIUC.<ref name=":132">{{Cite web|title=Flight Dynamics Model - FlightGear wiki|url=http://wiki.flightgear.org/Flight_Dynamics_Model|access-date=2019-07-23|website=FlightGear wiki}}</ref><ref>{{Cite book|last1=Zhang Jingsha|last2=Geng Qingbo|last3=Fei Qing|title=International Conference on Automatic Control and Artificial Intelligence (ACAI 2012) |chapter=UAV Flight Control System Modeling and Simulation Based on FlightGear |date=2012 |url=http://mr.crossref.org/iPage?doi=10.1049/cp.2012.1443 |pages=2231–2234|publisher=Institution of Engineering and Technology|doi=10.1049/cp.2012.1443|isbn=978-1-84919-537-9}}</ref>