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Fluids, Volume 7, Issue 11

November 2022 - 21 articles

Cover Story: Turbulent pipe flow laden with realistic DNA macromolecules is investigated through a hybrid Eulerian–Lagrangian approach solving the incompressible Navier–Stokes equation alongside the evolution of 10⁸ polymer dumbbells. Such an innovative approach comes in line with a current trend of numerical simulations that move toward the “first-principles”-like methods and bring more detailed and accurate descriptions of the physical phenomena. A drag reduction of 26% is achieved at friction Reynolds number 320 and Weissenberg number 20,000. An increase in the flow rate and turbulent kinetic energy is observed. Near the wall, the majority of the polymers are fully stretched and aligned along the streamwise direction, inducing an increase in the turbulence anisotropy. View this paper

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2 Citations

2,871 Views

18 Pages

Computational Fluid Dynamics Approach for Oscillating and Interacting Convective Flows

Attila Gergely and
Zoltán Néda

Fluids2022, 7(11), 339;https://doi.org/10.3390/fluids7110339

24 October 2022

The oscillation and collective behavior of convective flows is studied by a computational fluid dynamics approach. More specifically, the rising dynamics of heated fluid columns is simulated in gravitational field using a simplified 2D geometry. The...

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Fluids - ISSN 2311-5521

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