...Abstract 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...

...1 Contact author: gahmadi@clarkson.edu A DNS study of the Dispersion and Deposition of Nano- and Micro-Particles in a Turbulent Channel Flow Amir A. Mofakham, Goodarz Ahmadi1 Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, NY John B. McLaughlin Department...

... exchange. From the computational results, the wider arrangement can introduce the effective vortices with small drag. Also, the longer vanes can introduce strong and effective vortices with smaller drag coefficient. Keywords: Supersonic vortex generator; DNS; Supersonic low-Reynolds number flow...

... the wall. The turbulent kinetic energies of large-scale flow and fine- scale eddies are attenuated by heavier particles. Different wave- number scaled structures were generated and disappeared as a laminarization process. Keywords: DNS, subcritical transition, turbulent channel flow, turbulent stripe...

... 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...

... direct numerical 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...

... discussed the relationship between viscoelastic ntribution, elastic energy and turbulent production. We found at viscoelastic contribution serves as a direct local source of rbulent production, and that energy is stored in the elasticity. y words: DNS, Viscoelastic flow, Drag-reduction, Giesekus model...

... aspects of the flow heat transfer, not only on the dimpled surface but also on smooth wall. In all cases the thermal efficiency using les was found to be significantly larger than other heat fer augmentation techniques currently employed. WORDS Dimples, Concavities; DNS; Transition; Flow structures...

... 03 03 2009 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...

..., Pr = 5.4. Results 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...

... 08 09 2008 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...

... proposed. 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...

... 08 09 2008 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...