2 edition of **Effects of streamline curvature on turbulent flow** found in the catalog.

Effects of streamline curvature on turbulent flow

Bradshaw, Peter.

- 128 Want to read
- 37 Currently reading

Published
**1973**
by AGARD in Neuilly-Sir-Seine
.

Written in English

**Edition Notes**

Statement | by P. Bradshaw ; edited by A.D. Young. |

Series | AGARDograph -- no.169 |

Contributions | Young, A. D. |

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

Pagination | [130p.] |

Number of Pages | 130 |

ID Numbers | |

Open Library | OL13953505M |

Streamline curvature in the plane of the mean flow is known to exert a proportionately greater effect on the turbulent mixing processes than might be expected from inspection of the conservation equations governing the evolution of the turbulence field. This study presents a partially averaged Navier–Stokes model, MSST PANS, based on a modified SST k − ω turbulence model to predict turbulent flows with large streamline curvature. The model was validated for turbulent flow in a 9 0 ∘ curved rectangular duct (Re = ,) to assess the MSST PANS capabilities. The predictions are compared against flow simulations for the same curved.

An experimental investigation of the effects of convex curvature and free-stream turbulence on momentum and heat transfer in a boundary Introduction Transition from laminar to turbulent boundary layer flow significantly increases local wall shear stress and convective heat transfer rates. The numerical scheme with a suitable turbulent flow model can be con- sidered as another promising way of analyzing the rotor wake. However, the literature survey (described later) on numerical analysis of two- and three- effects of streamline curvature and rotation. 3. To predict the development of turbulent wakes of a single airfoil and.

Turbulent boundary layers with large streamline curvature effects Article (PDF Available) in Zeitschrift für angewandte Mathematik und Physik ZAMP 29(1) December with 33 Reads. Effects of pressure gradients and streamline curvature on the statistics of a turbulent pipe flow. Liuyang Ding, Theresa Saxton-Fox, Marcus Hultmark, Fingerprint Dive into the research topics of 'Effects of pressure gradients and streamline curvature on the statistics of a turbulent pipe flow'. Together they form a unique fingerprint.

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The turbulence structure is highly sensitive to the additional mean strain rate introduced when the mean streamlines are curved in the plane of the mean shear.

Turbulent energy and shear stress are reduced relative to rectilinear flow when the angular momentum of the mean flow increases in the direction of the radius of curvature, as in a two-dimensional boundary layer on a convex wall, and increased when the angular momentum decreases with increasing radius Cited by: Experiments were carried out using a flow visualization method, a hot-wire anemometer and a signal analyzer.

The results indicate that development of a turbulent wake is promoted by Effects of streamline curvature on turbulent flow book destabilizing effect of streamline curvature and suppressed by the secondary flow effect of by: 8.

Abstract: Streamline curvature in the plane of the mean shear produces large changes in the turbulence structure of shear layers, usually an order of magnitude more important than normal pressure gradients and other terms in the mean-motion equations for curved flows.

The effects on momentum and heat transfer in boundary layers are noticeable on typical wing sections and are very.

Effects of Streamline Curvature on Turbulent Flow AGARDograph N° BRADSHAW, P. Year. Longitudinal curvature effects in turbulent boundary layers Progress in Aerospace Sciences, Vol. 33, No. Turbulence models for the computation of flow past airplanesCited by: On Turbulent Flows Dominated by Curvature Effects A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed.

Separated flows and the flow in a curved duct are examples of flow fields where streamline curvature plays a dominant role. The resulting flow fields were used to study the effects of streamline curvature by comparing the concave and convex sides of the channel.

Observed effects are consistent with experimental measurements for mild curvature. The most significant difference in the turbulence statistics is in the Reynolds shear stress. turbulent mixing are explored using second-moment closure for turbulence. Governing equations for The effects of streamline curvature and gravitational strat- ification acting together on turbulence in a mixed layer is the the effects of flow curvature on turbulence by rewriting the.

Fluid mechanics, turbulent ﬂow and turbulence modeling Lars Davidson Divisionof Fluid Dynamics Department of Mechanics and Maritime Sciences Chalmers University of Technology.

The effects of streamline curvature and swirl on turbulent flows in curved ducts A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed.

Separated flows, the flow in a curved duct, and swirling flows are examples of flow fields where streamline curvature plays a dominant role. PDF | A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed.

Separated flows and | Find, read and cite all the research you. The flow field of a two-dimensional turbulent plane jet in a weak crossflow is numerically investigated by employing the effect of streamline curvature in the mean and turbulent flow properties. The important predicted flow properties such as jet trajectory, velocity decay, mean flow profiles and turbulent stresses have been compared with the experimental data.

Effects of streamline curvature on turbulent flow. [Neuilly-sur-Seine, France] North Atlantic Treaty Organization, Advisory Group for Aerospace Research and Development.

[] (OCoLC) Document Type: Book: All Authors / Contributors: A D Young; Bradshaw, Peter.; North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Ding, L, Saxton-Fox, T, Hultmark, M & Smits, A' Effects of pressure gradients and streamline curvature on the statistics of a turbulent pipe flow ', Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFPSouthampton, United Kingdom, 7/30/19.

Its main underlying assumption is that the mean streamline curvature has no direct effect on the production and dynamics of each individual turbulent eddy, which is produced with the structure of purely sheared turbulence, and is subsequently convected downstream while retaining its initial anisotropy relative to fixed inertial coordinates.

The turbulence model captures main features of the stabilizing and destabilizing effects of streamline curvature, though some notable discrepancies between the predictions and measurements are present in boundary layers on convex by: 4.

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About; For Authors ; Vol Issue 8. No Access. Analysis of Streamline Curvature Effects on Wall-Bounded Turbulent Flows. In reality, the flows encountered in turbines are highly three‐dimensional, viscous, turbulent, and often transonic. These complex flows will not yield to understanding or prediction of their behavior without the application of contemporary and strong modeling techniques, together with an adequate turbulence model, to reveal effects of turbulence phenomenon and its impact on flow past.

Bradshaw P. The analogy between streamline curvature and buoyancy in turbulent shear flow. Fluid Mech. Subject: Citation Classic Commentary: Bradshaw P. "Effect of Streamline Curvature on Turbulance".

Current Contents #45, p, November 5. A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed. Separated flows, the flow in a curved duct, and swirling flows are examples of flow fields where streamline curvature plays a dominant role.

Streamline Flow. Streamline flow in fluids is defined as the flow in which the fluids flow in parallel layers such that there is no disruption or intermixing of the layers and at a given point, the velocity of each fluid particle passing by remains constant with time.Measurements on decaying grid turbulence subject to streamline curvature demonstrate that the extra mean strain rate imposed by streamline curvature can alter the evolution of turbulent kinetic energy and Reynolds shear stress.Turbulence modeling is the construction and use of a mathematical model to predict the effects of ent flows are commonplace in most real life scenarios, including the flow of blood through the cardiovascular system, the airflow over an aircraft wing, the re-entry of space vehicles, besides others.

In spite of decades of research, there is no analytical theory to predict the.