id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_xqonqbslxzeezjajrw3agvcaui	Michael Heidelberger	Applying Models in Fluid Dynamics	2006	16	.pdf	application/pdf	6956	549	60	1999, Siekmann 1998, Gad-el-Hak 1998, Anderson 1997, Wegener 1996, Tokaty 1994, Vincenti 1990, Böhme 1978, Kármán 1954.) Practical engineering problems in fluid dynamics – like flow of objects in water or air Prandtl's model is not a physical representation of the Navier-Stokes equations, but of a theory whose mathematical content is an approximation to these equations. In Prandtl's case, this would amount to the following: The fundamental theory, as presented by the Navier-Stokes equations, does not suggest by itself how it is to be represented How does Prandtl's model differ either from received physical representations of the basic equations or from representations of approximations to them? A new explanation achieves an increase in breadth in relation to a precursor if the theory covers "a wider range of occurrences than do the empirical laws previously established." And it deepens our understanding if at least one of the following conditions is fulfilled: 1.	./cache/work_xqonqbslxzeezjajrw3agvcaui.pdf	./txt/work_xqonqbslxzeezjajrw3agvcaui.txt