Calculation of the nonstationary interaction of jet flows with a two-dimensional target

1972 ◽  
Vol 22 (1) ◽  
pp. 20-25
Author(s):  
S. Yu. Bapat ◽  
I. A. Belov ◽  
P. S. Jain
Keyword(s):  
Jet Flows ◽  
Two Dimensional ◽  
Nonstationary Interaction

Noise from Impinging, Two‐Dimensional, Underexpanded Jet Flows

1965 ◽  
Vol 38 (3) ◽  
pp. 482-484 ◽  
Author(s):  
William J. Sheeran ◽  
Darshan S. Dosanjh
Keyword(s):  
Jet Flows ◽  
Two Dimensional ◽  
Underexpanded Jet

Visualization of Swirling Flows Using PIV in a Plating Bath

2007 ◽  
Author(s):  
Shinzaburo Umeda ◽  
Shinji Shigeyama ◽  
Kiyoshi Horii
Keyword(s):  
Fluid Dynamic ◽  
Dynamic Control ◽  
Swirling Flows ◽  
Jet Flows ◽  
Two Dimensional ◽  
Uniform Thickness ◽  
Plating Bath ◽  
Flip Flop ◽  
Chemical Plating ◽  
Basic Experiments

A uniform plating system useful in a chemical plating industry has been developed. For plating of tubes, uniform plating thickness has been achieved. The demands of a plating industry such as an uniform thickness plating and the gap plating between two parts were crucial. The development of new plating system was based on fluid dynamic control using flip-flop flows. Small swirls produced by flip-flop flows would give thorough mixing of liquid and take away the phenomenon that wakes behind tubes occur. For clarifying these phenomena, the velocity variations in a plating tank were measured using two-dimensional PIV. Basic experiments using flip-flop flows, conventional flows and jet flows were performed.

Separation of a boundary jet in a rotating fluid

1990 ◽  
Vol 217 ◽  
pp. 41-69 ◽  
Author(s):  
Melvin E. Stern ◽  
J. A. Whitehead
Keyword(s):  
Laboratory Experiment ◽  
Vertical Wall ◽  
Cumulative Effect ◽  
Obtuse Angle ◽  
Jet Flows ◽  
Separation Mechanism ◽  
Two Dimensional ◽  
Rotating Fluid ◽  
Separation Effect ◽  
Viscous Forces

A semi-infinite jet flows along a vertical wall in a rotating fluid, with the nose of the intrusion approaching a corner where the wall turns through an obtuse angle θ + 180°. The jet separates at the corner and flows into the interior if θ exceeds a critical θc, otherwise part of the jet continues around the corner and flows along the downstream segment of the wall. The separation criterion is computed using an inviscid and piecewise-uniform-vorticity model, with s denoting the ratio of the maximum ‘offshore’ to ‘inshore’ vorticity. The separation effect is demonstrated by a laboratory experiment in which a two-dimensional jet flows along the wall from a source. Average velocities are used to estimate s, and to make semi-quantitative comparisons of experimental and theoretical θc. This suggests that the separation mechanism is independent of local viscous forces, although the cumulative effect of lateral eddy stresses in the jet is important in establishing the value of s immediately upstream from the corner. We suggest that our barotropic separation mechanism is relevant to mesoscale oceanic coastal currents.

scholarly journals Group-Invariant Solutions for Two-Dimensional Free, Wall, and Liquid Jets Having Finite Fluid Velocity at Orifice

2011 ◽  
Vol 2011 ◽  
pp. 1-12
Author(s):  
R. Naz
Keyword(s):  
Fluid Velocity ◽  
Invariant Solution ◽  
Jet Flows ◽  
Order Partial Differential Equation ◽  
Free Wall ◽  
Two Dimensional ◽  
Invariant Solutions ◽  
Third Order ◽  
Group Invariant ◽  
Group Invariant Solutions

The group-invariant solutions for nonlinear third-order partial differential equation (PDE) governing flow in two-dimensional jets (free, wall, and liquid) having finite fluid velocity at orifice are constructed. The symmetry associated with the conserved vector that was used to derive the conserved quantity for the jets (free, wall, and liquid) generated the group invariant solution for the nonlinear third-order PDE for the stream function. The comparison between results for two-dimensional jet flows having finite and infinite fluid velocity at orifice is presented. The general form of the group invariant solution for two-dimensional jets is given explicitly.

Development of finite-amplitude two-dimensional and three-dimensional disturbances in jet flows

1986 ◽  
Vol 20 (5) ◽  
pp. 668-679
Author(s):  
S. Ya. Gertsenshtein ◽  
I. I. Olaru ◽  
A. Ya. Hudnitokii ◽  
A. N. Sukhorukov
Keyword(s):  
Three Dimensional ◽  
Finite Amplitude ◽  
Jet Flows ◽  
Two Dimensional

Capability Assessment of Five Different RANS-Based Turbulence Models to Simulate the Various Regions of Slot Turbulent Impingement Jet Flow

2017 ◽  
Author(s):  
Mahmoud Charmiyan ◽  
Ahmed-Reza Azimian ◽  
Ebrahim Shirani ◽  
Fethi Aloui
Keyword(s):  
Experimental Data ◽  
Turbulence Models ◽  
Jet Flows ◽  
Two Dimensional ◽  
Mean Flow ◽  
Impingement Jet ◽  
Image Velocimetry ◽  
The Mean ◽  
Bottom To Top ◽  
Plate Distance

In this paper, impingement of a turbulent rectangular flow to a fixed wall is investigated. The jet flows from bottom-to-top and the output jet Reynolds is 16000. The nozzle-to-plate distance is equal to 10 (H/e = 10). Five turbulence models, including k-ε, RNG k-ε, k-ω SST, RSM and v2f model have been used for two-dimensional numerical simulation of the turbulent flow. Because of the complexities of the impingement flow, such as curved streamlines, flow separation, normal strains and sudden deceleration in different areas, different turbulence models are proposed to simulate different regions of the flow. To investigate the capability of these turbulence models in simulating different regions of the impinging jet, the mean flow velocity field and turbulent kinetic energy are extracted and compared with the experimental data of a two-dimensional particle image velocimetry (PIV). The calculated error of these five turbulence models was presented for the various flow regions, while it have not been clearly investigated earlier. Results indicate the highest conformity of the v2f model with the experimental data at the jet centerline. However, this model does not predict well the flow at the shear layer and wall-jet areas. RSM Gibson and Lander model has the highest conformity with the experimental data in these regions.

Coherent Structures in the Similarity Region of Two-Dimensional Turbulent Jets

1984 ◽  
Vol 106 (2) ◽  
pp. 187-192 ◽  
Author(s):  
J. W. Oler ◽  
V. W. Goldschmidt
Keyword(s):  
Velocity Profile ◽  
Coherent Structures ◽  
Turbulent Jets ◽  
Jet Flows ◽  
Two Dimensional ◽  
Ordered Structure ◽  
Mean Velocity ◽  
The Mean ◽  
Plane Jet ◽  
Average Position

The strongest indication of an ordered structure in the similarity region of plane jet flows is the well documented (but controversial) apparent “flapping” behavior. Previously, the negative correlation between probes placed on opposite sides of the jet centerline has been attributed to the periodic displacement of the mean velocity profile centerline about its average position, i.e., a flapping motion. The present investigation is directed at evaluating the premise of an essentially two-dimensional von Karman vortex street as being responsible for the apparent “flapping” behavior.

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