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Keywords: DNS
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Proceedings Papers

Proc. ASME. FEDSM2021, Volume 3: Fluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow, V003T05A027, August 10–12, 2021
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2021-65494
... Abstract Flow over arrays of cubes is an extensively studied model problem for rough wall turbulent boundary layers. While considerable research has been performed in computationally investigating these topologies using DNS and LES, the ability of sublayer-resolved RANS to predict the bulk flow...
Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T04A020, July 13–15, 2020
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2020-20110
... Abstract Nano- and micro-particles dispersion and deposition in a dilute gas-solid turbulent flow in a channel were studied. A pseudo-spectral DNS code was used to solve the Navier-Stokes equations, and to generate the instantaneous turbulent velocity fluctuation field for the gas flow. Under...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A072, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5149
... scaled structures were generated and disappeared as a laminarization process. DNS subcritical transition turbulent channel flow turbulent stripe particle-fluid interaction ROBUSTNESS OF TURBULENT STRIPES IN PARTICLE-LADEN CHANNEL FLOWS Masaki Hanabusa1, Takahiro Tsukahara Tokyo University...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A052, July 28–August 1, 2019
Publisher: American Society of Mechanical Engineers
Paper No: AJKFluids2019-5312
... introduce the effective vortices with small drag. Also, the longer vanes can introduce strong and effective vortices with smaller drag coefficient. supersonic vortex generator DNS supersonic low-Reynolds number flow DIRECT NUMERICAL SIMULATION OF SUPERSONIC FLOW OVER A COUNTER- ROTATING VANE-TYPE...
Proceedings Papers

Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 2, Fora, 257-263, August 1–5, 2010
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM-ICNMM2010-30828
... Two-phase flows including particle-particle collisions and two-way coupling in a turbulent duct flow were simulated using a direct simulation approach. The direct numerical simulation (DNS) of the Navier-Stokes equation was performed via a pseudospectral method was extended to cover two-way...
Proceedings Papers

Proc. ASME. FEDSM2009, Volume 1: Symposia, Parts A, B and C, 1921-1927, August 2–6, 2009
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2009-78249
... simulation (DNS) of the Navier-Stokes equation via a pseudospectral method. The particle equation of motion included the drag and the shear induced lift forces. The effect of particles on the flow was included in the analysis via a feedback force that acted on the computational grid points. Several...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 275-284, July 30–August 2, 2007
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2007-37170
... For the purpose of elucidating the mechanism of drag reduction by additives and finding a way to judge optimum drag-reducing additives through a simple rheological test, we performed DNS analysis of viscoelastic fluid turbulent flow in a two-dimensional channel. In this calculation, we employed...
Proceedings Papers

Proc. ASME. HT-FED2004, Volume 2, Parts A and B, 401-412, July 11–15, 2004
Publisher: American Society of Mechanical Engineers
Paper No: HT-FED2004-56171
... to be significantly larger than other heat transfer augmentation techniques currently employed. 03 03 2009 Dimples Concavities DNS Transition Flow structures 2004 ASME Heat Transfer/Fluids Engineering Summer Conference Charlotte, North Carolina, USA E t eject and the dimp trans KEY INTR cons...
Proceedings Papers

Proc. ASME. HT-FED2004, Volume 2, Parts A and B, 909-916, July 11–15, 2004
Publisher: American Society of Mechanical Engineers
Paper No: HT-FED2004-56439
... Direct Numerical Simulation (DNS) of fully developed turbulent flow in a flume and channel was used to study the heat transfer near the wall. Two different geometries for numerical simulations of turbulent heat transfer in infinite channel and flume were used. Reynolds number based on friction...
Proceedings Papers

Proc. ASME. FEDSM2005, Volume 1: Symposia, Parts A and B, 395-402, June 19–23, 2005
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2005-77144
... of direct numerical simulation (DNS) were compared with the under-resolved simulation where the velocity field was still resolved with the DNS accuracy, while a coarser grid was used to describe the temperature field. Since the smallest temperature scales remained unresolved in this simulation...
Proceedings Papers

Proc. ASME. FEDSM2006, Volume 1: Symposia, Parts A and B, 581-585, July 17–20, 2006
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2006-98175
... This study is concerned with the effect of inter particle collisions on the particle concentration in turbulent duct flows. The time history of the instantaneous turbulent velocity vector was generated by the two-way coupled direct numerical simulation (DNS) of the Navier-Stokes equation via...
Proceedings Papers

Proc. ASME. FEDSM2006, Volume 1: Symposia, Parts A and B, 1389-1396, July 17–20, 2006
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2006-98109
... 3D Direct Numerical Simulations (DNS) of autoignition in turbulent non-premixed flows between fuel and hotter air have been carried out using both 1-step and complex chemistry consisting of a 22 species n-heptane mechanism to investigate spontaneous ignition timing and location. The simple...
Proceedings Papers

Proc. ASME. FEDSM2006, Volume 1: Symposia, Parts A and B, 1571-1578, July 17–20, 2006
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2006-98405
... Microbubble Drag Reduction DNS Turbulence Proceedings of FEDSM2006 2006 ASME Joint U.S. - European Fluids Engineering Summer Meeting July 17-20, Miami, FL Proceedings of FEDSM2006 2006 ASME Joint U.S. - European Fluids Engineering Summer Meeting July 17-20, Miami, FL 1 Copyright © 2006 by ASME density...