Issues of Paradigmatic Nature of the Turbulence Origin
Journal Title: INCAS BULLETIN - Year 2017, Vol 9, Issue 1
Abstract
The fluid such as deformable continuum, without own shape its motion, must be guided by some physical surfaces/boundaries, which are subjected to an action from fluid under the form of the wall pressure, equal to the reaction of the boundaries on the fluid. The fundamental law of equal action and reaction was easily misleading by assuming that the wall pressure is equal to the static pressure on the main motion. This result, known as Prandtl’s hypothesis associated to the concept of a Newtonian fluid, i.e. viscous fluid obeying to a linear law of frictional shear stress and constant viscosity, could resolved the no-drag crisis (d’Alembert’s paradox) and has dominated the paradigmatic development in research of Fluid Dynamics during the last century. However, the motions fluctuating in a disordered manner observed experimentally by Reynolds and known as turbulent/noisy motions or simply turbulence remain a physical and mathematical problem unsolved/nebulous up to the present. Indeed, the heaviest and most ambitious armory from theoretical physics and mathematics was tried for the last fifty years, but without much success: genuine turbulence, i.e. the big T (turbulence) – problem remains further as a new crisis/paradox. The physical/mathematical problems of turbulence being ones of paradigmatic nature concerning the behavior of flows close to boundaries, in this paper we propose a different approach of the fluid-boundary contact problem, i.e. a new law for the wall-bounded flows, complying better with the action-reaction law, responsible for most controversial aspects of turbulence.
Authors and Affiliations
Horia DUMITRESCU, Vladimir CARDOS
Keywords
Related Articles
- EP ID EP293060
- DOI 10.13111/2066-8201.2017.9.1.6
- Views 85
- Downloads 0
Air quality assessment based on road traffic pollutants dispersion modelling: Giurgiu – Ruse Bridge Case study
The paper presents a case study related to air quality assessment along an important high traffic bridge (Giurgiu - Ruse), by dispersion modelling of the main pollutants. In order to estimate the level of pollution cause...
The dependence of the appearance of the aircraft on the conditions of the Arctic basing
Positioning on the global political arena of the Arctic Territory as the exclusive economic zone of the Russian Federation requires, first of all, the development of a regional transport network, including cargo and pass...
Relativistic Contact-Wall Effects at Start-up
General relativity describes the physical force of gravity and its relation with the space-time structure. The fundamental physical insight behind the theory of general relativity is that the effects of acceleration cann...
SCALED RADIO CONTROLLED PLATFORM
The paper presents building, preparing and testing of a scaled RC aerial platform, as a basis for future flight measurements. The platform is a 1:6 scaled radio controlled model of AEROTAXI design in development. A numbe...
Concept Study of Radio Frequency (RF) Plasma Thruster for Space Propulsion
Electric thrusters are capable of accelerating ions to speeds that are impossible to reach using chemical reaction. Recent advances in plasma-based concepts have led to the identification of electromagnetic (RF) generati...