Direct Numerical Simulation in Two Dimensional Homogeneous Isotropic Turbulence Using Spectral Method

Mallik, Muhammad Saiful İslam; Uddin, Md. Ashraf; Rahman, Md. Arifur

doi:10.3329/jsr.v5i3.12665

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Large eddy simulation (LES) has become a sophisticated predictive method for understanding the physics of turbulence over the few decades. The position of LES approximation is conceptually intermediate between DNS [1][2][3] and Reynolds-averaged Navier-Stokes (RANS) [4] techniques. Although DNS is considered as the exact approach to turbulence simulation, but it uses fine grids to resolve all the scales of motion, thus requiring a huge amount of computational resources.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Standard Smagorinsky Model and Dynamic Smagorinsky Model in Large Eddy Simulation of Turbulent Channel Flow

2020

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This paper presents results of comparative study of large eddy simulation (LES) that is applied to a plane turbulent channel flow. The LES is performed by using a finite difference method of second order accuracy in space and a low-storage explicit Runge-Kutta method with third order accuracy in time. In the LES for subgrid-scale (SGS) modelling, Standard Smagorinsky Model (SSM) and Dynamic Smagorinsky Model (DSM) are used. Essential turbulence statistics from the two LES approaches are calculated and compared with those from direct numerical simulation (DNS) data. Comparing the results throughout the calculation domain, it has been found out that SSM performs better than DSM in the turbulent channel flow simulation. Flow structures in the computed flow field by the SSM and DSM are also discussed and compared through the contour plots and iso-surfaces.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Standard Smagorinsky Model and Dynamic Smagorinsky Model in Large Eddy Simulation of Turbulent Channel Flow

2020

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“…For studying flows of practical interest the LES is currently the most promising method (Balaras et al, 1996;Cabot, 1995;Cabot and Moin, 2000;Dritselis, 2014;GrÖtzbach, 1987;Mallik and Uddin, 2016;Mallik et al, 2014;Sagaut, 2001;Uddin et al, 2006;Uddin and Mallik, 2015;Xie et al, 2013;Yang et al, 2008). The position of LES is intermediate between DNS (GrÖtzbach, 1987;Mallik et al, 2013;Moser et al, 1999) and Reynoldsaveraged Navier-Stokes equations (RANS) techniques. Although DNS is considered as the exact approach to turbulence simulation, this simulation is very expensive for high Reynolds number case and requires large number of computational grids.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of turbulent channel flow using differential equation wall model

Mallik

Uddin

2018

J. nav. arch. mar. engg.

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A large eddy simulation (LES) of a plane turbulent channel flow is performed at a Reynolds number Re? = 590 based on the channel half width, ? and wall shear velocity, u? by approximating the near wall region using differential equation wall model (DEWM). The simulation is performed in a computational domain of 2?? x 2? x ??. The computational domain is discretized by staggered grid system with 32 x 30 x 32 grid points. In this domain the governing equations of LES are discretized spatially by second order finite difference formulation, and for temporal discretization the third order low-storage Runge-Kutta method is used. Essential turbulence statistics of the computed flow field based on this LES approach are calculated and compared with the available Direct Numerical Simulation (DNS) and LES data where no wall model was used. Comparing the results throughout the calculation domain we have found that the LES results based on DEWM show closer agreement with the DNS data, especially at the near wall region. That is, the LES approach based on DEWM can capture the effects of near wall structures more accurately. Flow structures in the computed flow field in the 3D turbulent channel have also been discussed and compared with LES data using no wall model.

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Hexagonal Fourier-Galerkin Methods for the Two-Dimensional Homogeneous Isotropic Decaying Turbulence

2014

JMS

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Direct Numerical Simulation in Two Dimensional Homogeneous Isotropic Turbulence Using Spectral Method

Cited by 3 publications

References 12 publications

Comparative Study of Standard Smagorinsky Model and Dynamic Smagorinsky Model in Large Eddy Simulation of Turbulent Channel Flow

Comparative Study of Standard Smagorinsky Model and Dynamic Smagorinsky Model in Large Eddy Simulation of Turbulent Channel Flow

Large eddy simulation of turbulent channel flow using differential equation wall model

Hexagonal Fourier-Galerkin Methods for the Two-Dimensional Homogeneous Isotropic Decaying Turbulence

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