3 edition of Dynamics of large-scale structures for jets in crossflow found in the catalog.
Dynamics of large-scale structures for jets in crossflow
1998 by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va .
Written in English
|Other titles||Dynamics of large scale structures for jets in crossflow.|
|Statement||Frank Muldoon and Sumanta Acharya.|
|Series||[NASA contractor report] -- NASA/CR-1998-206606., NASA contractor report -- NASA CR-206606.|
|Contributions||Acharya, Sumanta., Lewis Research Center., United States. National Aeronautics and Space Administration.|
|The Physical Object|
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Results of a three-dimensional unsteady computational study of a row of jets injected normal to a crossflow are presented with the aim of understanding the dynamics of the large-scale structures in the region near the jet.
The jet to crossflow velocity ratio is Cited by: 2. Dec 23, · Muldoon, Frank, and Acharya, Sumanta. "Dynamics of Large-Scale Structures for Jets in a Crossflow." Proceedings of the ASME International Gas Turbine and Author: Frank Muldoon, Sumanta Acharya.
Note: Citations are based on reference standards. However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. On the development of large-scale structures of a jet normal to a cross flow Physics of Fluids 13, ( “ Vortex structure of circular jets in crossflow,” J.
Wind Eng. and Industrial Aero 12, “ The dynamics of the near field of strong jets in crossflows,” J. Fluid Mech.
95 Cited by: The velocity ratio of the jet to that of the cross-flow is and the Reynolds number based on the free stream quantities and the jet exit diameter is The main objective of this study is to assess the effect of the hole exit geometry on the dynamics of large-scale structures in jets cross-flow interactions.
Fluid Dynamics of Highly Pitched and Yawed Jets in Crossflow Article in AIAA Journal 42(5) · May with 12 Reads How we measure 'reads'. Feb 01, · Using the method of large-eddy simulation, the 3-dimensional turbulent jets in crossflow with stream-wise and transverse arrangements of nozzle are simulated, emphasizing on the dynamical process of generation and evolution of vortex structures in these flows.
The results show that the basic vortex structures in literatures, such as the counter-rotating vortex pair, leading-edge vortices, lee Cited by: 8. On the dynamics of the large-scale structures in round impinging jets By J.W. HALL† AND D.
EWING Department of Mechanical Engineering, McMaster University, Hamilton, ON, L8S 4L7, Canada (Received 21 March and in revised form 28 October ) Time-averaged two-point measurements of the ﬂuctuating wall pressure and.
Turbulent particle dispersion in transverse jets depends closely on the evolution dynamics of the large scale fluid structures developing from the interaction between the jet and the crossflow. Results of a three-dimensional unsteady computational study of a row of jets injected normal to a crossflow are presented with the aim of understanding the dynamics of the large-scale structures in the region near the jet.
The jet to crossflow velocity ratio is Abstract. This paper presents results of the application of the Two-Stage Lagrangian (TSL) model of Broadwell and Lutz to the basic and advanced rebuming processes in a kW natural gas fired Boiler Simulator Facility (BSF).Author: M.
To the authors’ knowledge, there have been limited or no efforts in the literature to combine both hybrid RANS/LES type approaches with variable turbulent Schmidt number methods.
The length of the structures is 3 to 5 times the ﬂow depth while the width is between and 1 times ﬂow depth. In spite of the high roughness of the bed, these values are similar to those reported in the literature for laboratory experiments on large-scale turbulent ﬂow structures.
The dynamics of the large-scale turbulent ﬂow structures. Some Climate and Large Scale Dynamics (CLD) proposals address multidisciplinary problems and are often co-reviewed with other NSF programs, some of which, unlike CLD, use panels in addition to mail reviewers, and thus have target dates or deadlines.
The results show that the large-scale turbulent flow structures in a gravel-bed river occupy the entire depth of the flow and that they are elongated and narrow. The length of the structures is 3 to 5 times the flow depth while the width is between and 1 times flow depth.
Large Scale Turbulent Structures in Supersonic Jets by Ram Mohan Rao and Thomas S. Lundgren, P.I. We have solved this eigenvalue problem by a method described in a book by Betchov and Criminale.
We integrate inward from a large radius, using an asymptotic formula dynamics of the temporal jet is not greatly different from that of a. near-field region of jet development is dominated by vortex dynamics, evidence of an analogous large-scale organization in the self-preserving region is not yet conclusive.
Interest in the possible large-structure organization of the far field of turbulent jets and buoyant plumes has been fuelled by the large-scale flow organization apparent.
Jul 20, · Jet in crossflow mixing “On the development of large-scale structures of a jet normal to a cross ﬂow”, Phys of Fuild (),Vol.
13, pp upstream vortices and the lee-side vortices, respectively. Grinstein et al, “Dynamics of coherent structures and trasitioin to turbulence in free square jets”, Phys of Fuild (),Vol. Finally, snapshot proper orthogonal decomposition (POD) analysis was conducted, characterizing the coherent structures of the flow field, particularly the large-scale vortices.
It was observed that the large-scale vortices mainly occur in the shear layers of the jets and their occurrence is affected by the parameters of the howtogetridofbadbreath.club by: 4. Large Scale Turbulent Structures in Supersonic Jets.
J- ' \ / by Ram Mohan Rao and We have solved this eigenvalue problem by a method described in a book by Betchov and Criminale. We integrate inward from a large radius, using an asymptotic formula dynamics of the temporal jet is not greatly different from that of a spatially.
The large scale structure and mixing characteristics of the flowfield surrounding a single, underexpanded, sonic, transverse jet injected into a Mach crossflow were experimentally studied.
The flowfield was investigated at three distinct sets of flow conditions corresponding to a jet-to-crossflow momentum flux ratio of, and The chapter also constructs a computational model of a transverse jet in which actuations may be imposed as time-dependent boundary conditions to understand the vortex dynamics of the actuated flow, in particular the dynamic response of large-scale vortical structures—such as the counter-rotating vortex pair—to various modes of howtogetridofbadbreath.club: Y.M.
Marzouk, A.F. Ghoniem. In this paper the mechanism maintaining these large and very large scale structures in the upper layers of turbulent plane Poiseuille ow is studied by making use of the methods of statistical state dynamics (SSD) with averaging operator the streamwise average.
Conveniently, the fundamental dynamics of wall-turbulence is contained in the. This is seen in the dual problems of large-scale scientific knowledge that has little relevance to local decision makers, e.g., global climate models that are at a resolution that is not useful to subnational decision making, or local, tacit, or indigenous knowledge that is not seen as credible by national or international actors, e.g Cited by: Dynamics of Large-Scale Structures for Jets in a Crossflow.
Frank Muldoon, Sumanta Acharya. Physics of Hot Crossflow Ingestion in Film Cooling. Lee McGrath, James H. Leylek. A Systematic Experimental Study on the Aerodynamics of Leading Edge Film Cooling on a Large Scale High Pressure Turbine Cascade.
Sabine Ardey, Leonhard Fottner. Aug 26, · The presence of large scale structures in circular jets is well documented in the literature over a wide range of Reynolds numbers. This presentation explores in more detail the generation and interaction and the role they play in the development of the flow field.
It is based on experiments carried out, both in water and air jets, at Reynolds numbers up to 1,2 It is found, as Author: J. Laufer, F. Browand, R. Petersen. howtogetridofbadbreath.club Technical Report: Design guide for single circular cylinder in turbulent crossflow.
[LMFBR]Cited by: 2. The comparisons are undertaken for two mutually perpendicular planes in the jet-to-crossflow entrance zone (y/D = 0 and x/D = 1 planes), where in- and out-of plane velocity components in POD modes 1–6 are directly compared, showing a good quantitative agreement, underlining that LES predicts the same large scale flow dynamics as is captured Cited by: Although computational tools are well suited for modeling the dynamics of zero-net mass-flux actuators, the computational costs involved in large-scale flow control simulations necessitate the use of reduced-order models for these devices.
A new reduced-order model based on modeling only the slot of ZNMF jets in grazing flows is proposed. Dynamics of Large-Scale Structures and Heat Transfer in Turbulent Mixed Convection A.
Westhoff1, D. Schmeling1, J. Bosbach1 and C. Wagner1 1German Aerospace Center (DLR), Institute of Aerodynamics and Flow Technology, Bunsenstr.
10, D Gottingen, Germany, [email protected]¨. Studies on Wake-Disturbed Boundary Layers Under the Influences of Favorable Pressure Gradient and Free-Stream Turbulence: Part I — Experimetal Setup and Discussions on Transitio. Thermal and hydrodynamic flow field over a flat surface cooled with a single round inclined film cooling jet and fed by a plenum chamber is numerically investigated using large eddy simulation (LES) and validated with published howtogetridofbadbreath.club by: Laser‐induced fluorescence and particle streak velocity measurements were conducted to investigate the structure and dynamics of round turbulent jets.
The results suggest that the far‐field region of the jet is dominated by large‐scale vortical structures, which appear to be axisymmetric or helical a large part of the time. Entrainment and mixing of the reservoir fluid with the jet fluid Cited by: tags: Gross moist stability, Large-Scale Dynamics, Tropical Circulations.
The weakening of the Walker circulation in the tropical Pacific is a robust response to global warming in climate models. This can have a global impact on climate, because the convection in the ascending branch of the Walker circulation triggers planetary scale waves that.
large Ra indeed is a reminder of the low Ra structures. The dynamics of the large scale wind, its azimuthal os-cillation, diffusion, reorientation, cessation, and possible Ahlers, Grossmann, and Lohse: Heat transfer and large scale dynamics in Rev.
Mod. Phys., Vol. 81, No. 2, April–June The results of flow visualization and hot-film measurement in a water channel are presented in this paper, in which the effectiveness of controlling synthetic hairpin vortices in the laminar boundary layer is examined to reduce skin friction.
In this study, hairpin vortices were generated by periodically injecting vortex rings into a cross flow through a hole on a flat plate. To control the Author: Bonguk Koo, Yong-Duck Kang.
American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA DESJARDINS, O. () Detailed numerical investigation of turbulent atomization of liquid jets, International Conference on Liquid Atomization and Sprays, Vail, CO.
PAI, M., DESJARDINS, O., PITSCH, H. () Detailed numerical simulations of liquid jets in crossflow, Proceedings of the 47th AIAA Aerospace Meeting, Orlando, FL. extraction combined with proper data acquisition is necessary, if the dynamics and topology of the large-scale structures in the turbulent ﬂow are to be visualized.
In this paper, the fully turbulent planar jet is chosen as a candidate ﬂow for visualization of the topology of the underlying large-scale structures. Vortex Dynamics of Synthetic Jets: A Computational and Experimental Investigation. Mehmet Arik, Heat Transfer Generated by the Interaction of Single and Multiple Tandem Jets in Crossflow.
Amina Radhouane, Nejla Mahjoub, Hatem Mhiri, Large Scale Hydrogen Production From Nuclear Energy Using High Temperature Electrolysis.Experimental study of large scale plunging jets. Portland, OR. The lack of knowledge regarding air entrainment caused by large jets in hydraulic structures, such as downstream Pelton turbines, has led EDF (Electricité de France) to carry out a test series to optimize the La Coche Power howtogetridofbadbreath.club by: 1.The axisymmetric shear layer rolls up in the near field of the jet forming vortex rings.
The rings tilt as they convect downstream before becoming turbulent in the far field. The evolution of vortical structures reveals the presence of a helical structure in the flow field along with the occurrence of vortex howtogetridofbadbreath.club by: