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Showing 1 to 9 of 9 for “"Nek5000"”.
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High-resolution numerical investigation of hydrodynamics and sediment transport within emergent vegetation canopy
… performed using a spectral-element based solver, Nek5000. The staggered pattern of vegetation was similar to experiments conducted on the Odell-Kovasznay racetrack flume where a 5 cm gap was created within the vegetation patch to measure flow velocity using a 3D PIV setup. The main objective of …
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Large-eddy simulations of recirculation zones in channel-type molten salt reactors
… using large-eddy simulations performed in Nek5000. We also studied the effects of varying the size and shape of the stringer-tip using Nek5000’s mesh deformation capabilities. To our knowledge, this work is the first effort to apply large-eddy simulations to the MSRE and study the effects …
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Natural convection of molten salt in laterally heated and top cooled vertical cylinders
… the simulations, using the open-source code Nek5000. The different flow patterns and temperature distributions observed for the nine cases are documented. Validation of the results obtained is done by performing a grid-independent study to ensure all the length scales have been captured …
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Wall-Jet Turbulence and Mixing Control by Way of a Pulsed Inlet Velocity
… incompressible case at Rein = 6000 using the Nek5000 solver. The compressible wall-jet simulation indicates that the addition of a sine wave perturbation of 1% on the inlet velocity, at the initial shear layer, increases the wall-normal turbulence intensity at a Strouhal number (Sr) of 0.05 …
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Scalable non-blocking Krylov solvers for extreme-scale computing
… to further improve solver performance. The Nek5000 and Quda applications are used to analyze the effectiveness of these solvers in practice. Both applications are designed to perform well at scale, however they need further improvements to reach their desired performance. The resulting tools …
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Red Blood Cell Aggregation Characterization: Quantification and Modeling Implications of Red Blood Cell Aggregation at Low Shear Rates
… Computational Fluid Dynamic (CFD) solver, Nek5000, based on the spectral element method solution to the incompressible non-Newtonian Navier-Stokes equations. RBC aggregate sizes are quantified in controlled and measurable shear rate environments for 5, 10 and 15% hematocrit. Aggregate sizes …
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Air Ingress and Heat-Driven Flow Relaminarization in a Very High Temperature Reactor (VHTR)
… massively parallel, spectral element code called Nek5000. The first step incorporated a replication method along with recycled periodicity to successfully sustain turbulence throughout a very long pipe (L/D ratio = 234). Once turbulence is found to be sustained, the next vi and final step involved …
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Characterization of the Mechanism of Drag Reduction Using a Karhunen-Loève Analysis on a Direct Numerical Simulation of Turbulent Pipe Flow
… numerical simulation (DNS) is performed using NEK5000, a spectral element Navier-Stokes solver, the first exponentially convergent investigation of DNS of turbulence in a pipe. The base flow is performed at a Reynolds number of Re = 150, resulting in a KL dimension of D_KL = 2130. As in …
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Bulle-Effect and its implications for morphodynamics of river diversions
… based incompressible Navier-Stokes solver Nek5000, on which a Lagrangian point particle submodel was developed and implemented to model the transport of sediment. The simulations were computationally very expensive (∼ 240 million computational points), thus they required the use of the …