A Wave Theory of Incompressible Fluid Turbulence: Wall/ Elastic Turbulence
Journal Title: INCAS BULLETIN - Year 2016, Vol 8, Issue 2
Abstract
The true problem of turbulence dynamics is the problem of its origin and successive development from some initial conditions (IC) at some boundary conditions (BC) to an ultimate state restored, in a statistical sense, as fully developed turbulence. Since this intricate route is unknown up to now, a second approach is used quite frequently. That is, turbulent flows are studied as they are disregarding their origin, and without looking into some of the details of the mechanisms of turbulence production and sustenance. The last approach has been mainly represented by Kolmogorov’s papers which have kept the turbulence community quite busy until now. This fractional/ local approach aiming to describe theoretically the extremely complicated details of the visible fluctuating motion superimposed on a main motion, i.e. its “noise”, to the detriment of the essential aspects of turbulence (the origin and its self-sustaining mechanism), was however worth developing both mathematical and experimental analysis methods for the representation/ decomposition of the flow field. On the other hand, the extremely detailed decompositions became to some extent less useful by obscuring the physics of turbulence. In this paper, we propose a holistic approach for the entire evolution of turbulence phenomenon as being created and governed by boundary vorticity dynamics, which in our opinion mostly responds to Leonardo da Vinci’s questions: where the turbulence is generated, where the turbulence maintains for long, and where the turbulence comes to rest. In contrast to the previous approaches, here we will try firstly to understand the hidden causes of various existing visible facts and then to explain them.
Authors and Affiliations
Horia DUMITRESCU, Vladimir CARDOS
Keywords
Related Articles
- EP ID EP159423
- DOI 10.13111/2066-8201.2016.8.2.4
- Views 90
- Downloads 0
Validation of a helicopter turbulence model on PUMA 330 dynamics
Aircraft and algorithms used in automated flight control are always designed for calm atmospheric conditions; therefore, testing their behaviour in realistic atmospheric conditions implies the necessity for efficient tur...
Common aspects and differences in the behaviour of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fuselage
The paper analyzes, in parallel, common aspects and differences in the behavior of classical configuration versus canard configuration aircraft in the presence of vertical gusts, assuming the hypothesis of an elastic fus...
Drag coefficient modelling in the context of small launcher optimisation
The purpose of this paper is to present a fast mathematical model that can be used to quickly asses the drag coefficient for generic launcher configurations. The tool developed based on this mathematical model can be use...
The completion of the mathematical model by parameter identification for simulating a turbofan engine
The purpose of this paper is to set up a method to determine the missing engine design parameters (turbine inlet temperature T3T, airflow rate) which significantly influence the jet engines thrust. The authors have intro...
An Object-Oriented Approach to a Scenario-Based System Dynamics Fleet Model
Expanding the current capabilities of a scenario-based system dynamics fleet model is paramount in order to incorporate wider ranging boundary conditions for the assessment of the impact of future aircraft technologies a...