Squire's theorem allows many simplifications to be made in stability theory. If we want to decide whether a flow is unstable or not, it suffices to look at two-dimensional perturbations. These are governed by the Orr–Sommerfeld equation for viscous flow, and by Rayleigh's equation for inviscid flow.
Referencesedit
^Drazin, P. G., & Reid, W. H. (2004). Hydrodynamic stability. Cambridge university press.
^Squire, H. B. (1933). On the stability for three-dimensional disturbances of viscous fluid flow between parallel walls. Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 142(847), 621-628.
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squire, theorem, fluid, dynamics, states, that, perturbations, that, applied, shear, flow, velocity, field, form, displaystyle, mathbf, perturbations, which, least, stable, dimensional, form, displaystyle, mathbf, rather, than, three, dimensional, disturbances. In fluid dynamics Squire s theorem states that of all the perturbations that may be applied to a shear flow i e a velocity field of the form U U z 0 0 displaystyle mathbf U U z 0 0 the perturbations which are least stable are two dimensional i e of the form u u x z t 0 w x z t displaystyle mathbf u u x z t 0 w x z t rather than the three dimensional disturbances 1 This applies to incompressible flows which are governed by the Navier Stokes equations The theorem is named after Herbert Squire who proved the theorem in 1933 2 Squire s theorem allows many simplifications to be made in stability theory If we want to decide whether a flow is unstable or not it suffices to look at two dimensional perturbations These are governed by the Orr Sommerfeld equation for viscous flow and by Rayleigh s equation for inviscid flow References edit Drazin P G amp Reid W H 2004 Hydrodynamic stability Cambridge university press Squire H B 1933 On the stability for three dimensional disturbances of viscous fluid flow between parallel walls Proceedings of the Royal Society of London Series A Containing Papers of a Mathematical and Physical Character 142 847 621 628 nbsp This fluid dynamics related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Squire 27s theorem amp oldid 1031119438, wikipedia, wiki, book, books, library,