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Saturday, May 16, 2020 | History

3 edition of Turbulent separated flow past a backward-facing step found in the catalog.

Turbulent separated flow past a backward-facing step

Turbulent separated flow past a backward-facing step

a critical evaluation of two-equation turbulence models

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  • 11 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center in Hampton, Va .
Written in English

    Subjects:
  • Turbulence.

  • Edition Notes

    StatementS. Thangam, C.G. Speziale.
    SeriesICASE report -- no. 91-23., NASA contractor report -- 187532., NASA contractor report -- NASA CR-187532.
    ContributionsSpeziale, C. G. 1948-, Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15385549M

    Turbulent Flow over a Backward-Facing Step. Application ID: The backward facing step is an interesting case for studying the performance and solution strategy of a turbulence model. In this case, the flow is subjected to a sudden increase of cross-sectional area, resulting in a separation of flow starting at the point of expansion. Features of a reattaching turbulent shear layer in divergent channelflow. Turbulence statistics of periodically perturbed separated flow over backward-facing step. International Journal of Heat and Fluid Flow, Vol. 22, No. 4 Turbulent flow past a backward-facing step - A critical evaluation of two-equation models Cited by:

    Physics of Separated Flows — Numerical, Experimental, and Theoretical Aspects DFG Priority Research Programme – The Structure of the Drag Reduced Turbulent Flow over a Backward Facing Step — an experimental study. J. Dohmann. An Investigation of the Separated Flow Past an Oscillating Circular Cylinder. I. Teipel.   The two-equation kappa-epsilon model is used to analyze turbulent separated flow past a backward-facing step. It is shown that if the model constraints are modified to be consistent with the accepted energy decay rate for isotropic turbulence, the dominant features of the flow field, namely the size of the separation bubble and the streamwise component of the mean velocity, can be accurately Cited by: 9.

    The steady two-dimensional viscous supersonic turbulent flow over a backward facing step was calculated using the PHOENICS CFD code. The two-equation k– turbulence model was employed for the turbulent flow simulation. The effects of the incoming boundary layer, Reynolds number and inlet Mach number on the flow were : Josef Rom.   A Study of Periodic Flow Behavior Over Backward Facing Step in Low Reynolds Number. A burst wave-induced plasma actuator for controlling separated flow over a backward-facing step at low Reynolds numbers. Experimental Thermal and Fluid Science, Vol. 66 Transonic flow past a backward-facing step.


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Turbulent separated flow past a backward-facing step Download PDF EPUB FB2

Turbulent separated flow past a backward-facing step is analyzed from both the modeling and computational points of view. The two-equation K-ε turbulence model is modified to account for the Turbulent Flow Past the Backward-Facing Step: Modeling and Computations | SpringerLinkAuthor: Siva Thangam, Siva Thangam.

Numerical solution of turbulent flow past a backward facing step using a nonlinear K-[epsilon] model (SuDoc NAS ) [C. Speziale] on *FREE* shipping on qualifying : C. Speziale. Turbulent separated convection flow adjacent to backward-facing step—effects of step height International Journal of Heat and Mass Transfer, Vol.

49, No. Numerical Simulation of Counter-Current Dump Combustor for Efficient Flame StabilizationCited by: Turbulent flow past a backward facing step is chosen as a test case in an effort to resolve the variety of conflicting results that were published during the past decade concerning the performance.

The ability of two-equation models to accurately predict separated flows is analyzed from a combined theoretical and computational standpoint. Turbulent flow past a backward facing step is chosen as a test case in an effort to resolve the variety of conflicting results that were published during the past decade concerning the performance of two Author: S.

Thangam and C. Speziale. The problem of turbulent flow past a backward facing step is used in the present study to evaluate the potentiality of LES for the prediction and the analysis of separated flows.

Numerical results obtained by LES at a Reynolds number equal to 11 are compared with experimental data of Eaton & Cited by: 6. Friedrich R., Arnal M. () Turbulent Backward-Facing Step Flow.

In: Gersten K. (eds) Physics of Separated Flows — Numerical, Experimental, and Theoretical Aspects. Notes on Numerical Fluid Mechanics (NNFM), vol Cited by: 3. TURBULENT ATMOSPHERIC FLOW OVER A BACKWARD-FACING STEP Prepared by THE UNIVERSITY 0~ TENNESSEE SPACE INSTITUTE Turbulent Atmospheric Flow over a Backward-Facing Step -p 7.

AUTHOR(S) U. Kaul and Walter Frost Streamlines Over a Back Step in Turbulent Flow Using the Eddy Viscosity Model (Reynolds Number = x).

Turbulent separated flow 4. CONCLUSIONS A highly resolved numerical study of fully-developed turbulent flow past a backward-facing step has been performed using the standard and the nonlinear K-E models of by: The spanwise invariant flow over a swept, backward-facing step of height H at Re H =C 0 H/ν= with turbulent upstream conditions has been studied for Cited by: Regions of Interest in the Turbulent Backward Facing Step BFS literature shows that several regions of the BFS flow remain uncertain because data is limited, or contradictory.

This study will examine the step corner and second vortex because it experiences very low velocities (flow. Turbulent Flow Past a Backward Facing Step E-mail: [email protected] Get this from a library. Turbulent separated flow past a backward-facing step: a critical evaluation of two-equation turbulence models.

[S Thangam; C G Speziale; Langley Research Center.]. An experimental study was made of the flow over a backward-facing step. Excitations were given to separated flow by means of a sinusoidally oscillating jet issuing from a thin slit near the separation line. The Reynolds number based on the step height (H) varied ⩽ Re H ⩽ Effect of local forcing on the flow structure was scrutinized by altering the forcing amplitude (0 ⩽ A 0 Cited by: The problem of turbulent flow past a backward facing step is important in many technological applications and has been used as a standard test case to evaluate the performance of turbulence models in the prediction of separated by: We present the results of an experimental and numerical investigation of a turbulent flow over a backward-facing step in a channel.

Experimental data are visualized using a Particle Image. Abstract— Predication of reattachment length of separated shear layers in low Reynolds number turbulent flow is a challenging task to evaluate the capabilities of different turbulence models, especially for MEMS applications.

Physical significances of backward facing step. Investigation of turbulent separation in a forward-facing step flow investigations relative to those of a backward facing-step (Sherry et al., ). past the step face, this would open up. Pressure on the step face is similar to the case of transition: the degree of steadiness of turbulent flow is not so great as laminar flow but is larger than transitional flow.

For a backward-facing step, as Fig. 41 shows, a region of pressure plateau is forward for all three regimes, but its magnitude is, as expected, largest for turbulent flow followed by transitional and laminar flow.

A typical gas turbine combustion chamber flow presents similarities with the well-studied case of turbulent flow over a backward facing step, especially in the near-wall regions where the heat transfer phenomena take by: 3.

backward-facing step, the normal flat plate with a splitter plate, and the blunt fiat plate; in all these cases the separation line is straight and fixed by the geometry.

A separating/reattaching flow can be divided into four interacting zones (see fig. 1). The zones are: the separated free shear layer, the recirculating region under the shearFile Size: 2MB.Turbulent boundary layer Separated now region Turbulent boundary layer Detached flow Figure I (a) Traditional view of turbulent boundary-layer separation with the mean back­ flow coming from far downstream.

The dashed line indicates U = 0 locations. (b) A flow model with the turbulent structures supplying the small mean backflow.Numerical simulation of flow separation over a backward-facing step with high Reynolds number LES is a potential tool for simulating separated flow controlled by large-scale vortices.

Previous article in issue; M.L. RiethmullerPattern recognition analysis of the turbulent flow past a backward facing step. Phys. Fluids, 11 (12) ( Author: Fang-fang Wang, Shi-qiang Wu, Sen-lin Zhu.