3 edition of **Backward-facing step measurements at low Reynolds number, Re [lower case h]=500** found in the catalog.

Backward-facing step measurements at low Reynolds number, Re [lower case h]=500

Srba Jovic

- 22 Want to read
- 12 Currently reading

Published
**1994** by National Aeronautics and Space Administration, Ames Research Center, National Technical Information Service, distributor in Moffett Field, Calif, [Springfield, Va .

Written in English

- Laser Doppler velocimeter.

**Edition Notes**

Other titles | Backward facing step measurements at low Reynolds number, Re [lower case h]=500. |

Statement | Srba Jovic and David M. Driver. |

Series | NASA technical memorandum -- 108807. |

Contributions | Driver, David M., Ames Research Center. |

The Physical Object | |
---|---|

Format | Microform |

Pagination | 1 v. |

ID Numbers | |

Open Library | OL15398568M |

The numerical simulations are compared with measurements at the Mach number of and Reynolds number of × by different plasma generation power input. The increased surface pressure distribution over the immobile wedge with an activated DCD acts as if the surface had executed a pitching motion – the performance identical to a. Hence the title of this book: “Statistical theory and modeling for turbulent ﬂows.” The alternative to modeling would be to solve the three-dimensional, time-dependent Navier–Stokes equations to obtain the chaotic ﬂow ﬁeld, and then to average the solutions in order to obtain statistics. Scribd es el sitio social de lectura y editoriales más grande del mundo. Full text of "NASA Technical Reports Server (NTRS) Aeronautical engineering: A continuing bibliography with indexes (supplement )" See other formats.

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Backward-Facing Step Measurements at Low Reynolds Number, Reh= Srba Jovic* and David M. Driver Ames Research Center Summary An experimental study of the flow over abackward-facing step at low Reynolds number was performed for the pur-pose of validating a direct numerical simulation (DNS) which was performed by the Stanford/NASA Center forFile Size: 2MB.

Get this from a library. Backward-facing step measurements at low Reynolds number, Re [lower case h]= [Srba Jovic; David M Driver; Ames Research Center.]. Backward-Facing Step Flows for Various Expansion Ratios at Low and Moderate Reynolds Numbers This paper is concerned with the behavior of ﬂows over a backward-facing step geometry for various expansion ratios H/h, and A literature survey was carried.

Re h. Reynolds number based on the step height. s′ In detail, it is numerically predicted that 3-D effects will become important when Re >Backward-facing step measurements at low Reynolds number, Reh =NASA Technical Memorandum,Google ScholarCited by: Experimental and Theoretical Investigation of Backward-Facing Step Flow of air in a Reynolds-number range of 70 Re.

The complex turbulent flow behind a backward-facing step is modelled using a full Reynolds stress closure. In order to develop a closure model that can resolve the complex near-wall flow in the recirculation region and in the recovery region downstream of the reattachment point, the performance of a low and a high Reynolds number version of the full Reynolds Cited by: This experiment was basically performed for a backward facing step, for a range of Reynolds number (based on step height) from to At Reynolds number offlow is laminar and transition occurs between Reynolds number of and The height of step was 4 mm and width of the domain.

In this case the ratio of step height to outlet channel height is and the Reynolds number based on the step height and is 44, The domain is sketched in Figure Figure Geometry of the backward facing step flow.

Inlet profiles for velocities and turbulence quantities are specified at 4 step heights upstream of the step corner. The internal flow over a backward-facing step in the transitional regime (ReD = ) was studied based on direct numerical simulations. The predictions were carried out with the help of a finite.

Mehrez, Z., et al.: Mass Transfer Control of a Backward-Facing Step THERMAL SCIENCE, YearVol. 15, No. 2, pp. These approximations were used by [15]. In addition, in our work, the depth step is greater than 10h, where h is the height of the step (see fig. 1), which allows us to consider,Cited by: 9.

Coherent vortex structures (CVS) are discovered for more than half a century, and they are believed to play a significant role in turbulence especially for separated flows. An experimental study is conducted for a pressured backward-facing step flow with Reynolds number (Reh) being and A synchronized particle image velocimetry (PIV) system is developed for Author: Fangfang Wang, Ang Gao, Shiqiang Wu, Senlin Zhu, Jiangyu Dai, Qian Liao.

Turbulence modi cation by particles 99 Channel ﬂow: Backward-facing step ﬂow: Channel half-width, h 20mm Step height, H mm Channel span mm Expansion ratio Centreline velocity, U0 ms−1 Aspect ratio Reh= U0h ReH = U0H The paper presents the direct numerical simulation (DNS) of a confined backward facing (BFS) step geometry with a flow of two fluids with Prandtl numbers and The expansion ratio of the BFS geometry is equal to and the outflow of the geometry has a shape of a by: 2.

Numerical simulations of laminar flow over a 3D backward‐facing step Numerical simulations of laminar flow over a 3D backward‐facing step Williams, P. T.; Baker, A. WILLIAMS1* AND A. BAKER2 Computational Physics and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TNU.S.A.

2 Department of Engineering. Armaly et al. adopted experimental measurements of velocity in three dimensional laminar separated flows on backward facing step by using two components laser Doppler velocimeter with expansion ratio of and the range of Reynolds number from to and observed increase of recirculation regions with increase of Reynolds by: 2.

In this study, forced convection of Fe 3 O 4 –water nanofluid in a bifurcating channel was numerically studied under the influence of variable magnetic. Galerkin residual finite element method was used for numerical simulations. Effects of various values of Reynolds number (between and ), Hartmann number (between 0 and 3), and solid nanoparticle volume Cited by: 2.

For the monodisperse systems, 35 different combinations of the Reynolds number Re (up to Re = 1,) and packing fraction ϕ were studied, whereas for the bidisperse systems we also varied the diameter ratio (from to ) and composition, which brings the total number of different systems that we considered to Cited by: A structured, curvilinear, body-conforming grid is generated.

First, a surface grid is constructed from the designer's blueprint. The forward and midship superstructures are represented by two numerical blocked structures, followed by a flight deck, and a lower missile deck. Particle image velocimetry (PIV) has evolved to be the dominant method for velocimetry in experimental fluid mechanics and has contributed to many advances in our understanding of turbulent and complex flows.

In this article we review the achievements of PIV and its latest implementations: time-resolved PIV for the rapid capture of sequences of vector fields; Cited by: Fluid Flow Pdf.

Presentation of the Case. The experiments are due to Almeida et al. The channel height is mm and the maximum height of the hill h max = 28 mm and the length mm. The Reynolds number based on h max and the channel centre-line velocity (upstream of the hill) is 60, The measurements were taken in the vertical centre-plane of.

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By addressing a number of cutting-edge applications, together with the relevant physical and mathematics fundamentals, the book provides readers with a comprehensive overview of the current research work in the field. The book’s primary emphasis is on aerodynamic research in aeronautics and astronautics, and in ground transportation and.

From Fig. 2, it can be observed that at high Re ( – ), the Nusselt number for oval and obround tubes are rela- tively high as compared to circular, diamond and rhombus tubes, respectively.

However, at low Re (10 – ), the Nusselt number is almost equal for all shape of. Full text of "Flow control [electronic resource]: fundamentals and practices" See other formats. Hence, for a constant Oh number, increase in the Weber number or the Reynolds number results in enhanced atomization characteristics of the turbulent liquid jet.

23 Figure Different breakup regimes based on Reynolds number [1, 2] Farago et al. [11] characterized different breakup behavior displayed by round liquid jets in a coaxial.

Hot-wire measurement technique was used to measure three Reynolds stresses and higher-order mean products of velocity fluctuations. The Reynolds number, Re(sub h), based on the step height, h, and the reference velocity, U(sub 0), The upstream oncoming flow was fully developed turbulent boundary layer with the Re(sub theta) = Large-eddy simulation of a backward facing step flow using a least-squares spectral element method.

NASA Technical Reports Server (NTRS) Chan, Daniel C.; Mittal, Rajat. We report preliminary results obtained from the large eddy simulation of a backward facing step at a Reynolds number of The numerical platform is based on a high order. Test Case Turbulent flow over a backward facing step is modeled.

The flow separates at the step and reattaches on the wall downstream, enclosing a region of recirculation. The inlet is at 4 H upstream and the outlet at 30 H downstream from the location of the step, where H is the step height. Reynolds number based on the step-height is about 5/5(1).

His observations led to identification of a single dimensionless parameter, now called the Reynolds number, and denoted Re, ρU L, () Re = µ that completely characterizes flow behavior in this situation.

In this expression ρ and µ are, respectively, the fluid properties density and dynamic viscosity. When applied to turbulent channel flow in a range of friction Reynolds number from Re τ = to Re τ =the resulting turbulence intensity profile and energy spectra exhibit exactly the same qualitative behaviour as DNS data throughout the entire wall-normal location, while reproducing the early theoretical predictions of Townsend and.

The buoyancy effect on the flow distributions are revealed for flow conditions with Reynolds number based on cylinder diameter of Re = andblockage ratio of BR = D/H =aspect ratio of AR = W=D = 5, pitch-to-diameter ratio of σ = L=D = 3, and values of the buoyancy parameter (Richardson number) in the range -1≤ Ri ≤ 3.

Shobayo and D. Walters, "Evaluation of Performance and Code-to-Code Variation of a Dynamic Hybrid RANS/LES Model for Simulation of Backward-Facing Step Flow." Proceedings of the ASME 5th Joint US-European Fluids Engineering Summer Conferencepaper FEDSM, VT08A DOI: /FEDSM (), with Eqs () de®ning p using an origin at x xi, we have for the ith equation of the uniform mesh h dNj ~ dNi k eÿ2 Pe x=h j Ni eÿ2 Pe x=h Q dx 0 dx dx ÿh with j i ÿ 1, i, i 1.

For the case of high pore Reynolds number ﬂow, Hsu and Cheng () found the thermal dispersion conductivity tensor k to be given by k = Dk f 1− Ped () The linear variation with Ped is consistent with most of the existing experimental correlations for high pore Reynolds number ﬂow.

At low pore Reynolds number This investigation examines turbulent flow across a contoured wall with evenly-spaced slots and a series of flow bifurcations, as found in industrial pulp screening. The contoured wall and slotted apertures are formed from an array of 'wires', with cross-sectional geometry characterized by contour height and wire width.

Four complementary studies were conducted to examine the. by-nc-nd pub astronomia fisica public The chain-branching process leading to ignition in the hydrogen-air mixing layer is studied by application of a novel WKB-like method with a.

For moderate Reynolds numbers (up to Re ≈ ) our steady-state calculations for the backward-facing step ﬂow consist of only a few explicit steps followed by Newton iterations.

For the deﬁnition of the operators A and A U we use T equal to a typical time step (∆ t = 5 × 10 − 3). The problem geometry was fixed and, thus, for a given Reynolds number, the flow dynamics depended only on the recirculation volume flow rate.

For laminar flow, periodic vortex shedding from the step edge was observed within a range of recirculation flow rates, both in experiments and two-dimensional simulations.

It is demonstrated that this self-consistent description based on the classical log-law fits all the known high Reynolds number data, and in particular their Reynolds number dependence, exceedingly well; i.e.

within experimental errors. [Preview Abstract] Monday, Novem PM - PM.Abstract The analysis intended to identify the various food consumption of the people of East Nusa Tenggara was carried out by using the data from Susenas in East Nusa Tenggara Province in There were households included in the analysis those were classified according to income level (low, middle, high) and residence (rural, urban).Turbulence structures affecting stone stability in backward-facing step flow.