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Keywords: Direct Numerical Simulation
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Proceedings Papers

Proc. ASME. FEDSM2022, Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), V002T05A008, August 3–5, 2022
Paper No: FEDSM2022-86863
...% followed by 10% by PANS and RANS showed the largest error of 14%. turbulent heat transfer direct numerical simulation turbulence modeling low Pr flow thermal transport channel flow backward facing step rod bundle pipe Proceedings of the ASME 2022 Fluids Engineering Division Summer Meeting...
Proceedings Papers

Proc. ASME. FEDSM2022, Volume 1: Fluid Applications and Systems (FASTC); Fluid Measurement and Instrumentation (FMITC); Fluid Mechanics (FMTC), V001T03A027, August 3–5, 2022
Paper No: FEDSM2022-87645
... the design of bio-inspired underwater robots. direct numerical simulation immersed boundary method bio-inspiration hydrodynamics Proceedings of the ASME 2022 Fluids Engineering Division Summer Meeting FEDSM2022 August 3-5, 2022, Toronto, Ontario, Canada FEDSM2022-87645 BODY SHAPE EFFECTS...
Proceedings Papers

Proc. ASME. FEDSM2022, Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), V002T05A003, August 3–5, 2022
Paper No: FEDSM2022-86684
... Abstract Through direction numerical simulation (DNS) of a model manta ray body, pectoral fin scaled pitching effect on hydrodynamic performance and wake is investigated. The manta ray model is derived from high-speed video of manta ray swimming with motion of the model prescribed to match...
Proceedings Papers

Proc. ASME. FEDSM2021, Volume 3: Fluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow, V003T05A023, August 10–12, 2021
Paper No: FEDSM2021-65655
...Abstract Abstract In this work, direct numerical simulation (DNS) is used to investigate how airfoil shape affects wake structure and performance during a pitching-heaving motion. First, a class-shape transformation (CST) method is used to generate airfoil shapes. CST coefficients...
Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T03A019, July 13–15, 2020
Paper No: FEDSM2020-20386
.... The airway bending at different head posture and the corresponding change in airway cross-sectional area are modeled based on measurements from literature. An immersed-boundary-method (IBM)-based direct numerical simulation (DNS) flow solver was adopted to simulate the corresponding unsteady flows...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A074, July 28–August 1, 2019
Paper No: AJKFluids2019-5242
...Abstract Abstract The key mechanism that sustains fluid turbulence flowing through a channel is examined using the Lagrangian experiment, done in a direct numerical simulation (DNS) of the turbulent fluid flow and that being damped by addition of a small amount of small particles. The results...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 1: Fluid Mechanics, V001T01A060, July 28–August 1, 2019
Paper No: AJKFluids2019-4722
..., Nagoya, Japan ABSTRACT We have run a Direct Numerical Simulation of a spatially developing shear mixing layer. The aim of this study is to clarify the influence of the large-scale structure on the turbulent Prandtl number PrT . As a main conclusion, PrT takes a small value (PrT 0.5) in the dominant...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 2: Computational Fluid Dynamics, V002T02A077, July 28–August 1, 2019
Paper No: AJKFluids2019-5261
...Abstract Abstract We tested Artificial Neural Networks (ANNs) to predict a fully-developed turbulent channel flow of a viscoelastic fluid in preparation for elucidating flow phenomenon and solving the difficulty in DNS (Direct Numerical Simulation) due to numerical instability...
Proceedings Papers

Proc. ASME. FEDSM2010, ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 1423-1427, August 1–5, 2010
Paper No: FEDSM-ICNMM2010-30554
... of CBF under normal and the above disease conditions that use direct numerical simulations (DNS) for the individual capillaries along with the experimental data in a one- dimensional model to determine the flow rate and the methods for regulating CBF. The model also allows us to determine which regions...
Proceedings Papers

Proc. ASME. FEDSM2008, Volume 1: Symposia, Parts A and B, 121-128, August 10–14, 2008
Paper No: FEDSM2008-55156
... 10 07 2009 Predicting interactions between particles and a surrounding viscous fluid is the concern of many environmental and industrial applications. A Direct Numerical Simulation (DNS) of dilute isotropic turbulent particulate flow has been conducted in a periodic box, with 128 3...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 841-851, July 30–August 2, 2007
Paper No: FEDSM2007-37125
... the calculations of instantaneous point variables of fluid phase with moving discrete boundaries of the smaller particles with direct numerical simulation, the boundary of each macro particle is just dealt with the blocked-off approach. On the other hand, the flow fields based on the present method is solved...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 1283-1290, July 30–August 2, 2007
Paper No: FEDSM2007-37076
... of direct numerical simulation (DNS) of the turbulent channel flow at the Reynolds number of 300, based on the friction velocity and channel half width, in order to achieve this objective. The basic equations of the DNS are the Navier-Stokes and continuity equations for incompressible flows. The GS and SGS...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 1301-1309, July 30–August 2, 2007
Paper No: FEDSM2007-37172
... 26 03 2009 Direct numerical simulation (DNS) has been conducted to investigate turbulence transition process and fine scale structures in Taylor-Couette flow. Fourier-Chebyshev spectral methods have been used for spatial discretization and DNS are conducted up to Re = 12000...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 1329-1337, July 30–August 2, 2007
Paper No: FEDSM2007-37234
... 26 03 2009 Direct numerical simulations of homogeneous isotropic turbulence laden with particles have been conducted to clarify the relationship between particle dispersion and coherent fine scale eddies in turbulence. Dispersion of 10 6 particles are analyzed for several particle...
Proceedings Papers

Proc. ASME. FEDSM2003, Volume 2: Symposia, Parts A, B, and C, 1313-1314, July 6–10, 2003
Paper No: FEDSM2003-45670
... explored the dependence of the RDF on the system parameters (e.g., particle size, concentration, response time and Reynolds number) using direct numerical simulations. These results have improved our understanding and ability to predict the effect of the first three parameters; however, owing...
Proceedings Papers

Proc. ASME. FEDSM2006, Volume 1: Symposia, Parts A and B, 573-580, July 17–20, 2006
Paper No: FEDSM2006-98168
... 08 09 2008 Particle dispersion and the resulting material erosion in a three-dimensional wake of circular cylinder were investigated by using direct numerical simulation (DNS). The domain decomposition method with patched grid and the high-order finite difference schemes were used...