Cover of: Study of the effects of high intensity sound on turbulent incompressible flow | William C. Carlson

Study of the effects of high intensity sound on turbulent incompressible flow

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Naval Postgraduate School , Monterey, California
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Statementby William C. Carlson and Richard F. Pittenger
ContributionsPittenger, Richard F., Naval Postgraduate School (U.S.)
The Physical Object
Pagination1 v. :
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Open LibraryOL25129708M

From the incompressible solution originate from three effects: (1) a wave operator instead of the Laplacian, (2) mean density gradients in the source, and (3) fluctuating density gradients in the source. The relative importance of these effects depend on the flow in question.

5 Green's function analysis The pressure equation, Size: KB. A study of compressibility e ects in the high-speed turbulent shear layer using direct simulation density and speed of sound in the high-speed stream by U1.

Turbulent intensity, independent of contraction angle and Reynolds number, decays exponentially[4]. Jang et al. Studied experimentally and numerically effects of axisymmetric contraction on a turbulent pipe flow the reduction in turbulence intensity in the core region.

The present study is a contribution to the analysis of wall-bounded compressible flows, including a special focus on wall modeling for compressible turbulent boundary layer in a plane channel. Compressibility effects are present in many practical turbulent flows, ranging from shock-wave/boundary-layer interactions on the wings of aircraft operating in the transonic flight regime to supersonic and hypersonic engine intake flows.

Besides shock wave interactions, compressible flows have additional dilatational effects and, due to the finite sound speed, pressure fluctuations are Cited by:   The Study of Wall Y+ of Incompressible Turbulent Flow Over High Lift Devices Using CutCell Meshing In this study three dimensional numerical simulations were carried out for steady incompressible flows around complex airfoil : Ramadan Ghmati, Badih Jawad, Liping Liu, Selin Arslan.

The compressible turbulent shear layer: an experimental study pressible flow. It is essential that these effects be understood in a coherent and universal way. The limited amount of experimental data in two-stream compressible The spreading rate of the incompressible turbulent shear layer has been foundCited by: Incompressible flow In the mathematxal treatment of turbulent incompressible flow (see Ch.V of Ref.1) it is usually assumed that the motion can be separated into (4 a mean flop whose components are u, v, w* and (b) a superposed turbulent flow whose components are u', v', w',File Size: 2MB.

FLOW AND PRESSURE FIELD ANALYSIS OF PARALLEL GROOVE GEOMETRY FOR AN INCOMPRESSIBLE FLUID WITH CONVECTIVE INERTIA EFFECTS by John Zuk, Lawrence P. Ludwig, and Robert L. Johnson Lewis Research Center SUMMARY A set of two-dimensional equations that includes both convective inertia and viscous.

Details Study of the effects of high intensity sound on turbulent incompressible flow EPUB

The problem of acoustic radiation generated by instability waves of a compressible plane turbulent shear layer is solved. The solution provided is valid up to the acoustic far-field region.

It represents a significant improvement over the solution obtained by classical hydrodynamic-stability theory which is essentially a local solution with the Cited by: This updated and revised edition of Dr.

Ronald L. Panton's Incompressible Flow provides readers with an exceptionally clear, unified, and carefully paced introduction to advanced concepts in fluid mechanics. Dubbed by one reviewer as "the most teachable book on the market," it begins with basic principles and then patiently develops the math and physics leading to the major theories/5(2).

Background on Internal Turbulent Flow Simulations 6 Turbulent Forced Convection with Property Variations Due to Heat Transfer 12 Objectives and Accomplishments of the Present Study 15 Outline of the Thesis 17 CHAPTER 2.

INCOMPRESSIBLE FILTERED EQUATIONS AND SUBGRID SCALE MODELS an incompressible pattern’, generally holds. Huang, Coleman & Bradshaw () observed that the turbulent stresses scale with the wall shear stress, τ w, and semi-local scaling (to be discussed later) is useful.

Lechner, Sesterhenn & Friedrich () reported a slight change in Reynolds stresses anisotropy at M= without giving an Size: KB. Selected applications of DNS will be the subject of the section “ Selected DNS Applications ” where the focus will be on recent results obtained for flows at high Reynolds number and on ‘non-classical’ effects associated with the formation of large rollers (Couette flow), and with compressibility effects.

The behavior of passive scalars Author: Sergio Pirozzoli. The work presented in this thesis was on nominally two-dimensional turbulent boundary layers at zero pressure gradient subjected to high free-stream turbulent intensities of up to % in preparations for high free-stream turbulence studies on three-dimensional boundary layers, which will be done in the future in the Aerospace and Ocean Engineering Boundary Layer Wind Tunnel at Virginia Tech.

An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects Edgar Orsi Filho Abstract The work presented in this thesis was on nominally two-dimensional turbulent boundary layers at zero pressure gradient subjected to high free-stream turbulent intensities of up to % in preparations for high free.

William K. Blake, in Mechanics of Flow-Induced Sound and Vibration, Volume 1 (Second Edition), Acoustically-Useful Representations for Homogeneous Turbulence.

In this book we will consider turbulent flow sources whose properties exhibit a wide range of statistical characteristics. De-Ling Liu, in Developments in Surface Contamination and Cleaning: Particle Deposition, Control and Removal, Turbophoresis.

Description Study of the effects of high intensity sound on turbulent incompressible flow PDF

Turbopheresis is a phenomenon in which the net migration of particles occurs from regions of high to low turbulence intensity, i.e.

toward surfaces where the turbulent velocity fluctuations decrease to zero. Physically, particles in regions of high turbulence. A parametric study is done to investigate the change in a turbulent flow field caused by the passage of a shock wave.

Two parameters are studied: the initial turbulent kinetic energy and the shock wave strength or density jump. A random or turbulent flow field is initiated within a two‐dimensional box. Euler’s equations are then solved using a second‐order accurate Godunov shock Cited by: The Incompressibility Assumption All materials, whether gas, liquid or solid exhibit some change in volume when subjected to a compressive stress.

The degree of compressibility is measured by a bulk modulus of elasticity, E, defined as either E=δp/ (δρ/ρ), or E=δp/(-δV/V), where δp is a change in pressure and δρ or δV is the. turbulent transition of incompressible boundary layers M.

Fortea,*, J. Perrauda, A. Seraudiea, S. Begueta, L. Gentilia and G. Casalisa aONERA, 2 av. Edouard Belin, Toulouse, France Abstract In this paper, the effects of gaps on the boundary layer transition are investigated on an ONERA-D airfoil both experimentally and numerically.

incompressible flow is referred to as ideal-flow theory. Laminar vs. Turbulent Viscous Flows Laminar flow = smooth orderly motion composed of thin sheets (i.e., laminas) gliding smoothly over each other Turbulent flow = disorderly high frequency fluctuations superimposed on.

Figure 1. T supersonic wind tunnel and the nozzle unit with changeable profiled inserts for the Mach number M = A gas-cylinder station with the maximal air pressure up to 18 bar allows the working conditions to be maintained for about 10 min with the extreme Reynolds number Re 8 10 7 m-1 at the direct-flow operation and the Mach number of the flow M = by: 8.

In this paper, the effects of changing under-relaxation factors for different variables on the numerical solution of 2D incompressible laminar flow over a backward-facing step (BFS) are studied using PHOENICS commercial Computational Fluid Dynamics (CFD) software.

This is conducted by changing under-relaxation factors for velocities and pressure during the 2D : Yogeswaran Sinnasamy, Noor Arbiah Yahaya, Shahnor Basri, Abdul Aziz Jaafar, Azmin Shakrine Mohd Rafi.

Incompressible Turbulent Flows Details Last Updated on Friday, 28 July DNS pseudospectral codes. The codes solve the incompressible Navier-Stokes or the Boussinesq equations in case of stratified flow together with the passive scalar transport equation in a parallelepiped domain with periodic boundary conditions.

Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used.

The book provides the reader with the necessary background and current trends in. In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers.

Turbulence is commonly observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney.

Assumptions 1 The flow is steady and incompressible. 2 The entrance effects are negligible, and thus the flow is fully developed. 3 The pipe involves no components such as bends, valves, and connectors.

4 The piping section involves no work devices such as pumps and turbines. The Turbulent Boundary Layer in Compressible Flow W. CoP~, M.A., E., of the Engineering Division, N.P.L. Reports and Memoranda No. 28¢o* November, SummaryThe flow of a compressible gas past a fiat plate is investigated for a turbulent boundary layer.

TheFile Size: KB. Abstract: We report here the results of a study on measurements and prediction of laminar-turbulent transition at high free-stream turbulence in boundary layers of the airfoil-like geometries with presence of the external pressure gradient changeover.

The experiments are performed for a number of flow cases with different flow Reynolds number.

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We present an experimental study of drag reduction by polymer additives in a closed turbulent flow with a zero mean velocity at large Reynolds numbers.

The study is performed using two different forcing schemes: a smooth forcing, for which the fluid is brought into movement through viscous boundary layers, and a very rough forcing where the fluid is stirred inertially by by:   At that time, the fluid flow looks like incompressible state(i.e, density variation in space is negligible).

I guess that the stability problem is related to the phase chage from compressible to incompressible. CFD people said that in incompressible state, the speed of sound becomes larger so that the CFL number needs a smaller time step size.Turbulent Flow Begins when the boundary layer transitions from the laminar layer.

Which creates the water becomes confused and being to stumble creating eddies and these eddies begin to grow in size, and flow continues aft.