Turbulence modeling and simulation advances in CFD during the past 50 years

Schiestel, Roland; Chaouat, Bruno

doi:10.5802/crmeca.114

Cited by 5 publications

(8 citation statements)

References 180 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This high resolution DNS database can also be used to validate subgrid turbulence models used in LES and hybrid RANS/LES methodologies keeping in mind, however, that instead of RANS, LES usually depends on the grid spacings (Lesieur & Métais 1996; Meneveau & Katz 2000; Chaouat 2017 b ; Schiestel & Chaouat 2022). Strictly speaking, the RANS and LES motion equations take exactly the same mathematical form if we assume that the commutation terms arising from the filtering operation are negligible; the difference relies only on the closure of equations (Chaouat 2017 a , b ).…”

Section: Modelling Of the Passive Scalar Transport Equationsmentioning

confidence: 99%

“…Direct numerical simulation (DNS) development began with the pioneering work of the Stanford team with the investigation of the fully developed turbulent flow in a plane channel (Kim, Moin & Moser 1987) for the Reynolds number based on the friction velocity , half-channel width and dynamic viscosity , and is now a very valuable tool (Lee & Moser 2015; Paul, Papadakis & Vassilicos 2018) thanks to the rapid increase of super-computer power as well as the development of computational techniques including vectorization and parallelization (Schiestel & Chaouat 2022). Numerical simulations of turbulent flows are useful also in this framework of heat transfer for determining the thermal flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it will be shown how to use this DNS database to devise and calibrate scalar flux equation models. This database will constitute a useful resource for researchers involved in Reynolds averaged Navier–Stokes model equations (RANS) (Hamba 2004; Schiestel 2008; Gatski 2009; Hanjalic & Launder 2011), large eddy simulation (LES) (Lesieur & Métais 1996; Meneveau & Katz 2000; Abe & Suga 2001) and also hybrid RANS/LES methodologies (Chaouat 2017 b ; Chaouat & Schiestel 2005, 2012, 2021 a , b ), considering that these methodologies are complementary tools from each other, as mentioned recently by Schiestel & Chaouat (2022).

Figure 1.Set-up of the numerical channel flow simulations subjected to constant scalar fluxes from both walls in the normal direction .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Contribution of direct numerical simulations to the budget and modelling of the transport equations for passive scalar turbulent fields with wall scalar fluctuations

Chaouat

2023

J. Fluid Mech.

View full text Add to dashboard Cite

We perform direct numerical simulations (DNS) of the fully developed turbulent channel flow with a passive scalar subjected to constant time-averaged scalar fluxes at the wall. The first case (case I) considers a constant time-averaged scalar flux $\left \langle q_w \right \rangle$ along with the specific condition of a non-fluctuating scalar $\theta _w$ imposed at the wall implying zero wall scalar fluctuation $\theta '_w=0$ and zero variance (isoscalar boundary condition) whereas the second case (case II) accounts for a constant instantaneous scalar flux $q_w$ in time and space leading to zero gradient of scalar fluctuation along the normal to the wall $(\partial \theta '/ \partial x_n)_w = 0$ (isoflux boundary condition) implying a non-zero variance. The friction Reynolds number takes on the value $R_\tau =395$ and the molecular Prandtl numbers considered are $P_r=0.01$ , 0.1, 1 and 10. The purpose is to investigate the effect of the wall scalar fluctuations on the scalar field. Emphasis is put on the mean passive scalar $\left \langle \theta \right \rangle$ , the half-scalar variance $k_\theta$ , the turbulent scalar fluxes $\tau _{i \theta }$ , the correlation coefficients $R_{i \theta }$ , the passive scalar to dynamic time-scale ratio $\mathcal {R}$ , the turbulent Prandtl number $Pr_t$ and higher-order scalar statistics. Systematic comparisons between these two scalar fields are undertaken. As a result of interest, it is found that the mean scalar remains almost the same whatever the type of the boundary layer condition but not the scalar variance. The budgets of transport equations for the half-scalar variance and turbulent fluxes reveal that some scalar quantities such as the dissipation-rate and the molecular diffusion terms are highly modified in the near-wall region but not really the production, diffusion and the scalar-pressure gradient correlation terms in a first approximation. Visualization of the instantaneous scalar fields indicates that the topology of the structures is strongly modified as the Prandtl number increases from $P_r=0.01$ up to $10$ . Finally, it is shown how to use this DNS database to devise and calibrate scalar flux equation models in the framework of both first and second moment closures. This study suggests that accounting for wall scalar fluctuations should be considered in the simulation of turbulent flows involving fluid and solid combinations at the interface and provides a useful high resolution DNS database.

show abstract

Section: Modelling Of the Passive Scalar Transport Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Figure 1.Set-up of the numerical channel flow simulations subjected to constant scalar fluxes from both walls in the normal direction .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Contribution of direct numerical simulations to the budget and modelling of the transport equations for passive scalar turbulent fields with wall scalar fluctuations

Chaouat

2023

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…CFD is particularly useful for understanding complex fluid phenomena such as turbulence, which is a fundamental aspect of many fluid systems. By using numerical methods to solve the Navier-Stokes equations, CFD simulations can provide insights into the behavior of fluids that are difficult to study experimentally [20]. CFD has become a vital tool for engineers and scientists to design and optimize complex fluid systems, and it continues to be an active area of research and development.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamic study on design and modification of underwater remotely operated vehicle

Mayo,

Shi,

2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Remotely Operated Vehicle (ROV) has been widely used in numerous underwater exploration applications such as exploration of complex deep sea environment, pipeline detection, installation, maintenance, and repair. Thus, it is worthy to design, optimize, and performance evaluation of ROV systems for underwater exploration purposes. Computational Fluid Dynamic (CFD) is a computational approach that is very helpful and widely used to examine the flow characteristics of ROV systems. In this research work, CFD analyses of ROV bodies with different thruster blades were carried out in order to generate thrust forces by the thruster blades. For this purpose, ANSYS FLUENT was used to examine the flow characteristics over the ROV body. The analyses were performed at different flow velocities, such as 1 m/s, 1.5 m/s, 2 m/s, 2.5 m/s, 3 m/s and 3.5 m/s. The outcomes were in the form of thrust force, drag force, pressure distribution, and velocity distribution. The result shows that four-blade thruster generates maximum thrust force as compare to other ROV thruster models. The main reason behind this higher thrust force is due to the larger motion of the fluid. Similarly, drag force was also investigated and observed that the drag force is greater for thruster model 3, having four blades due to the large frontal area of the ROV body and thruster blades. The results obtained in this study are very helpful for engineers and researchers to design and optimize ROV models using numerical methods.

show abstract

“…Indeed, most of the practical flows targeted by industrials involve turbulence whose effects strongly impact drag predictions or the noise radiated by aircraft. This led to the development of the Reynolds Averaged Navier-Stokes (RANS) formulation which remains the current workhorse of the aerospace industry owing to its low computational cost and high robustness [1]. However, in the context of a growing demand for greener aircraft and environment preservation, new industrial needs in aerodynamics and aeroacoustics require the prediction of three-dimensional unsteady turbulent flows around complex and detailed geometries for which the RANS approach is defective.…”

Section: Introductionmentioning

confidence: 99%

A hybrid lattice Boltzmann - Navier-Stokes method on overset grids

Suss

Mary

Garrec

et al. 2023

AIAA AVIATION 2023 Forum

View full text Add to dashboard Cite

This paper presents an overset grid strategy in the context of a hybrid lattice Boltzmann -Navier-Stokes method for unsteady aerodynamic and aeroacoustic applications. While the overset grid approach is usually used to couple multiple overlapping grids with different mesh topologies together through interpolations, it is proposed to extend this methodology by enabling to switch between numerical methods across the grids making up the computational domain. Thereby, one can reach nearly optimal running conditions in terms of meshing strategy and numerical properties for the simulation of high Reynolds number flows. The key feature of this work lies in the way the information exchange is performed at the interface between the lattice Boltzmann method (applied on Cartesian grids) and the finite-volume Navier-Stokes method (dedicated to curvilinear meshes). All the numerical aspects of the coupling procedure are thoroughly discussed and the developed strategy is assessed on unsteady test cases representative of aerodynamic and aeroacoustic problems.

show abstract

Turbulence modeling and simulation advances in CFD during the past 50 years

Cited by 5 publications

References 180 publications

Contribution of direct numerical simulations to the budget and modelling of the transport equations for passive scalar turbulent fields with wall scalar fluctuations

Contribution of direct numerical simulations to the budget and modelling of the transport equations for passive scalar turbulent fields with wall scalar fluctuations

Computational fluid dynamic study on design and modification of underwater remotely operated vehicle

A hybrid lattice Boltzmann - Navier-Stokes method on overset grids

Contact Info

Product

Resources

About