Asymptotic Modelling of Fluid Flow Phenomena by Radyadour Kh. Zeytounian

By Radyadour Kh. Zeytounian

This can be the 1st publication dedicated fullyyt to asymptotic modelling of fluid move phenomena and offers with the paintings of the asymptotic modelling of Newtonian laminar fluid flows. This asymptotic modelling includes deriving fluid circulate version difficulties in one of these manner that they develop into amenable to mathematical research and to numerical simulations. the most target of the textual content is modelling and never the presentation of solutions.
One could imagine that for your time to come back the additional growth of the functions of numerical simulations depends upon, or will at the least be relating to, the advance of asymptotic modelling. The booklet contains the elemental features, contemporary advancements, and the present matters very important to the asymptotic modelling of fluid circulation phenomena.

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More precisely, in any perturbation problem, namely: involving a small positive parameter approximate solution of the form: it is natural to seek an where x ranges over some (usually bounded) domain D and is an asymptotic sequence, often the power sequence which tends to zero as cannot be valid uniformly in x. For example, this approximate solution may fail to satisfy all boundary conditions (moreover, in applications, physical considerations will often indicate which boundary conditions are so omitted).

2 we give, first, a mathematical formulation of the full Bénard thermal convection problem, taking into account the temperature dependent free surface tension and the deformation of the free surface. 3 and the ‘modified’ Rayleigh-Bénard (R-B) problem is formulated. 4. 5 the Marangoni effect (related to the temperature dependent free-surface tension), for a deformable free surface, is taken into account and the so-called BénardMarangoni (B-M) problem is formulated. A lubrication evolution equation for the thickness of the film is derived.

3. 1. Dimensionless parameters Our analysis which follows will be mainly formal, resting on limiting processes and asymptotic expansions applied to the NS-F equations. This requires that all is, at the outset, written in dimensionless form. 30d) appears the following main dimensionless parameters: which are well known and are, according to the order of the writing: Reynolds, Mach, Strouhal, and Prandtl numbers. 49) are indexed by stands “c” which holds for “characteristic value” of the indexed quantity.

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