archimedes number atwood number average bagnold number biot number bipedalism bond number brinkman number capillary number cauchy number dean number deborah number digital object identifier eckert number ekman number fluid dynamics galilei number graetz number grashof number gravity current hagen number hydraulic jump knudsen number laplace number lewis number mach number magnetic prandtl number magnetic reynolds number marangoni number morton number nusselt number ohnesorge number pendulum prandtl number rayleigh number reynolds number richardson number roshko number rossby number rouse number ruark number running schmidt number sherwood number speed of sound stanton number stokes number strouhal number supercritical flow supersonic taylor number turbulent prandtl number ursell number velocity wave making resistance weber number weissenberg number william froude womersley number