15,122 Hits in 5.4 sec

Flow Visualization of Multi-Hole Film-Cooling Flow under Varying Freestream Turbulence Levels

Timothy W. Repko, Andrew C. Nix, S. Can Uysal, Andrew T. Sisler
2016 Journal of Flow Control Measurement and Visualization  
A flat plate film cooling flow from a multi-exit hole configuration has been numerically simulated using both steady and unsteady Reynolds Averaged Navier Stokes (RANS and URANS) Computational Fluid Dynamics  ...  This paper presents a numerical study of the flow visualization of the interaction of film cooling jets with a subsonic crossflow.  ...  Tim Fitzsimmons of the DOE Office of Science/EPSCoR. The authors would also like to thank CD-ADAPCO for their software training and support throughout this analysis.  ... 
doi:10.4236/jfcmv.2016.41002 fatcat:enlfk4uqw5fhrjijo6urp3vnz4

Vortex shedding from a ground tracking radar antenna and 3D tip flow characteristics

Cengiz Camci, Baris Gumusel
2013 Progress in Computational Fluid Dynamics, An International Journal  
A 2D unsteady computation of the vortex shedding phenomena is also presented.  ...  The current analysis uses a 3D computational approach for the computation of viscous flow details around a highly 3 D tip geometry.  ...  UNSTEADY FLOW SIMULATIONS OF VORTEX SHEDDING A 2D unsteady and incompressible solution of the Navier-Stokes equations for ASDE-X antenna was performed using the general purpose fluid dynamics solver Fluent  ... 
doi:10.1504/pcfd.2013.055055 fatcat:r3w4fbiz4zfijhjjulxdilbkbm

Numerical Simulation of Turbulent Flow Over of Semi-Cylindrical Profile at Zero Angle of Attack

Alexander Shebelev, Andrey Gavrilov, G.V. Kuznetsov, P.A. Strizhak, E.E. Bulba, A.O. Zhdanova
2016 MATEC Web of Conferences  
Results of unsteady two-dimensional numerical simulations for the turbulent flow over the semi-cylindrical profile at Reynolds number 45000 are presented.  ...  A series of calculations have been performed for the estimation of influence of mesh resolution in the wake of streamlined body on the unsteady solution accuracy.  ...  The low level of pressure can be explained by the high intensity of vortex flow generating under the body (fig Table 1 . 1 Parameters computational meshes.  ... 
doi:10.1051/matecconf/20167201100 fatcat:fotmpv37ujakpa6hvgevx57tuu

Subject Index

1990 Journal of Aircraft  
90-003 Viscous Non-boundary-Layer Flows Measurements and Implications of Vortex Motions Using Two Flow-Visualization Techniques 90-160 Vortices Yaw Damping of Elliptic Bodies at High Angles of Attack  ...  Sweep, Vortex Lift, and Vortex Strength for Delta Wings 90-080 Unsteady Inviscid and Viscous Computa- tions for Vortex-Dominated Flows 90-062 Control of Turbulent Separated Flow over a Rearward-Facing  ... 
doi:10.2514/3.56841 fatcat:kz6h2jnjsvd5znrdxardgncnce

Investigation on RANS Computation for an Unsteady Turbulent Flow

Kazuya KODAMA, Kazuyuki TODA, Makoto YAMAMOTO
2007 Journal of Fluid Science and Technology  
Visualization and investigation of the temporal change of the flow pattern and the instantaneous term-by-term budget of the governing equations reveals that the RANS computation can reproduce the unsteady  ...  In the present study, RANS computations for two-dimensional turbulent flow with periodic perturbation over a backward-facing step are performed in order to verify the performance of a low-Reynolds-number  ...  Computational Conditions We performed computations for a two-dimensional backward-facing step turbulent flow with periodic perturbation. Figure1 shows a schematic diagram of the computed flow field.  ... 
doi:10.1299/jfst.2.623 fatcat:zhdpc5nr6zha5o7hbch3ysqcve

High resolution computational unsteady aerodynamic techniques applied to manoeuvring UCAVs

S. A. Morton, R. M. Cummings, J. R. Forsythe, K. Wurtzler
2007 Aeronautical Journal  
AbstractA method of high resolution simulation is proposed for Unmanned Combat Air Vehicles (UCAVs) undergoing manoeuvress at high angle-of-attack or transonic speeds.  ...  Finally, a notional UCAV shape from Boeing military aircraft is presented to show the possibilities of how the method can accurately capture the relevant phenomenon of these difficult flight regimes.  ...  We w ould also like to thank the DoD High Performance Computing Modernization Office for the grant of computer hours, as well as, Boeing Military Aircraft in St.  ... 
doi:10.1017/s0001924000004656 fatcat:uycyotc2kbbabnfmyksl6wmaa4

Current status on large-eddy simulation for engineering applications

T. Kobayashi, M. Tsubokura
2007 Journal of Visualization  
Progress on High-Performance Computing and Large-Eddy Simulation The remarkable history of CFD has been supported by a few milestones relating to HPC technology.  ...  High-Performance Large-Eddy Simulation for Engineering Applications Two examples of the world's largest class LES for engineering applications are introduced to show the validity of numerical visualization  ... 
doi:10.1007/bf03181822 fatcat:rlrtfbluzrcxrbzg5y4j66kfiq

Measurement Methods in Rotating Components of Turbomachinery

B. Lakshminarayana, P. Runstadler
1981 Journal of Engineering for Power  
This symposium covered all of these aspects while addressing measurements on fluid flow (pressure, velocity, density, turbulence intensity and stress, wall shear stress, unsteady blade pressure) and temperature  ...  The flow itself may be unsteady, with subsonic, supersonic, and transonic regions and associated shock phenomena. It is certainly viscous and usually turbulent with appreciable three dimensionality.  ...  This symposium covered all of these aspects while addressing measurements on fluid flow (pressure, velocity, density, turbulence intensity and stress, wall shear stress, unsteady blade pressure) and temperature  ... 
doi:10.1115/1.3230731 fatcat:ak22dkhwqjerrlvijdnd3nfusi

Large Eddy Simulation of isothermal cruciform jet flow: Preliminary results

B.T. Kannan, P. Ssheshan, Sundararaj Senthilkumar
2016 Perspectives in Science  
The flow field of turbulent jet from cruciform nozzle are described in terms of inverse mean axial velocity decay and visualizations.  ...  Three-dimensional cuboid shaped domain was used to simulate the unsteady turbulent flow field.  ...  Acknowledgement The first author acknowledges the kind and timely help of Professor Willie R. Quinn of St. Francis Xavier University, Canada for providing the experimental data.  ... 
doi:10.1016/j.pisc.2016.01.003 fatcat:eohruxfatzdo7dg5dvfmy7mj5m

Computational visualization of unsteady flow around vehicles using high performance computing

Makoto Tsubokura, Toshio Kobayashi, Takuji Nakashima, Takahide Nouzawa, Takaki Nakamura, Huilai Zhang, Keiji Onishi, Nobuyuki Oshima
2009 Computers & Fluids  
Finally, unsteady aerodynamic forces acting on the vehicle in transient yawing-angle change are estimated and relationship between the flow structures and the transient aerodynamic forces is mentioned.  ...  The main objective of our study is to look into the validity of LES for the assessment of vehicle aerodynamics, especially in the context of its possibility for unsteady or transient aerodynamic forces  ...  ACKNOWLEDGMENTS This work has been supported by the projects of FSIS and "Revolutionary Simulation Software (RSS21)" sponsored by MEXT, Japan.  ... 
doi:10.1016/j.compfluid.2008.01.020 fatcat:b2bczfi3j5hahp4xgd5ik57yle

Revealing essential dynamics from high-dimensional fluid flow data and operators [article]

Kunihiko Taira
2019 arXiv   pre-print
We consider concepts centered around modal analysis, data science, network science, and machine learning to reveal the essential dynamics from high-dimensional fluid flow data and operators.  ...  The presentation of the material herein is example-based and follows the author's keynote talk at the 32nd Computational Fluid Dynamics Symposium (Japan Society of Fluid Mechanics, Tokyo, December 11-13  ...  high-dimensional fluid flow data and operators.  ... 
arXiv:1903.01913v1 fatcat:xved2uchejgcjo7ezmucpzqnmy

Toward the simulation of complex 3D shear flows using unsteady statistical turbulence models

Joongcheol Paik, Liang Ge, Fotis Sotiropoulos
2004 International Journal of Heat and Fluid Flow  
Comparisons between the computed results and laboratory measurements and flow visualization experiments lead to the conclusion that even relatively simple turbulence closure models (such as the standard  ...  Recent progress in the numerical simulation of complex, 3D incompressible flows with unsteady statistical turbulence models is reviewed.  ...  Acknowledgements This work was supported by NSF Career grant 9875691, a grant from Georgia DOT, and a grant from Oak Ridge National Laboratory and DOE. We thank Terry W.  ... 
doi:10.1016/j.ijheatfluidflow.2004.02.002 fatcat:awhb6b644jht5dm2u32v4m4buu

Numerical prediction of steady and unsteady tip vortex cavitation on hydrofoils

Paweł Flaszyński, Jan A. Szantyr, Krzysztof Tesch
2012 Polish Maritime Research  
a short description of the method and a computational example demonstrating its performance.  ...  The objective of the research was to design the optimum discrete grid structure for this specific computational task and to select the best turbulence model for such an application The article includes  ...  Acknowledgement The research described in this article has been conducted with the support of the Research Grant No. N N504 088738 of the Polish National Centre for Research and Development (NCBR).  ... 
doi:10.2478/v10012-012-0026-2 fatcat:ormxj7qcfnalrimswtdh3tmby4

Evaluation of three turbulence models in static air loads and dynamic stall predictions

1990 Journal of Aircraft  
This work summarizes the performance of these three turbulence models for a variety of steady and unsteady flow conditions.  ...  Concluding Remarks A number of steady and unsteady flows of interest to fixed and rotary wing industries have been calculated using three turbulence models.  ... 
doi:10.2514/3.25285 fatcat:vjq4rvtoavfkpi2li4mmkzjvaq

An investigation into the interaction of closely-spaced starting jets

D. Rival, G. Ciccarelli
2007 Experimental Thermal and Fluid Science  
Flow visualization of the scavenging flow was performed using a scaled fixed-piston water model and was used as a means of validating the URANS simulations themselves.  ...  The flow visualization experiments provided insight into the complex jet-jet and jet-wall interactions within the engine cylinder.  ...  A handful of studies examining the relation between entrainment rates and unsteady jets have been performed.  ... 
doi:10.1016/j.expthermflusci.2006.12.004 fatcat:e2v3cqedtjfkzcryb3puzekkiy
« Previous Showing results 1 — 15 out of 15,122 results