Energy spectrum in high-resolution direct numerical simulations of turbulence

2016 ◽  
Vol 1 (8) ◽  
Author(s):  
Takashi Ishihara ◽  
Koji Morishita ◽  
Mitsuo Yokokawa ◽  
Atsuya Uno ◽  
Yukio Kaneda
Keyword(s):  
Energy Spectrum ◽  
High Resolution ◽  
Numerical Simulations ◽  
Direct Numerical Simulations

Energy dissipation rate and energy spectrum in high resolution direct numerical simulations of turbulence in a periodic box

2003 ◽  
Vol 15 (2) ◽  
pp. L21-L24 ◽  
Author(s):  
Yukio Kaneda ◽  
Takashi Ishihara ◽  
Mitsuo Yokokawa ◽  
Ken’ichi Itakura ◽  
Atsuya Uno
Keyword(s):  
Energy Spectrum ◽  
Energy Dissipation ◽  
High Resolution ◽  
Numerical Simulations ◽  
Dissipation Rate ◽  
Energy Dissipation Rate ◽  
Direct Numerical Simulations

scholarly journals Analysis of the dissipative range of the energy spectrum in grid turbulence and in direct numerical simulations

2020 ◽  
Vol 5 (4) ◽  
Author(s):  
Anastasiia Gorbunova ◽  
Guillaume Balarac ◽  
Mickaël Bourgoin ◽  
Léonie Canet ◽  
Nicolas Mordant ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Grid Turbulence

scholarly journals Direct numerical simulations of particle-laden density currents with adaptive, discontinuous finite elements

2014 ◽  
Vol 7 (3) ◽  
pp. 3219-3264 ◽  
Author(s):  
S. D. Parkinson ◽  
J. Hill ◽  
M. D. Piggott ◽  
P. A. Allison
Keyword(s):  
High Resolution ◽  
Numerical Simulations ◽  
Turbidity Current ◽  
Direct Numerical Simulations ◽  
Three Dimensions ◽  
Turbidity Currents ◽  
Normal Velocity ◽  
Density Currents ◽  
Conservation Of Energy ◽  
Computationally Expensive

Abstract. High resolution direct numerical simulations (DNS) are an important tool for the detailed analysis of turbidity current dynamics. Models that resolve the vertical structure and turbulence of the flow are typically based upon the Navier–Stokes equations. Two-dimensional simulations are known to produce unrealistic cohesive vortices that are not representative of the real three-dimensional physics. The effect of this phenomena is particularly apparent in the later stages of flow propagation. The ideal solution to this problem is to run the simulation in three dimensions but this is computationally expensive. This paper presents a novel finite-element (FE) DNS turbidity current model that has been built within Fluidity, an open source, general purpose, computational fluid dynamics code. The model is validated through re-creation of a lock release density current at a Grashof number of 5 × 106 in two, and three-dimensions. Validation of the model considers the flow energy budget, sedimentation rate, head speed, wall normal velocity profiles and the final deposit. Conservation of energy in particular is found to be a good metric for measuring mesh performance in capturing the range of dynamics. FE models scale well over many thousands of processors and do not impose restrictions on domain shape, but they are computationally expensive. Use of discontinuous discretisations and adaptive unstructured meshing technologies, which reduce the required element count by approximately two orders of magnitude, results in high resolution DNS models of turbidity currents at a fraction of the cost of traditional FE models. The benefits of this technique will enable simulation of turbidity currents in complex and large domains where DNS modelling was previously unachievable.

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