Interface methods for grey-area mitigation in turbulence-resolving hybrid RANS-LES

Arvidson, Sebastian; Davidson, Lars; Peng, Shia-Hui

doi:10.1016/j.ijheatfluidflow.2018.08.005

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…The magnitude of the commutation term was found to be of the same order as the turbulence production term. This was further investigated by Arvidson et al (2018) in their hybrid RANS-LES method based on the k − ω model. It was shown that the commutation residue term can significantly accelerate the transition from modelled to resolved turbulence, and thus effectively mitigating the errors in the grey area.…”

Section: Introductionmentioning

confidence: 99%

Variable resolution in scale-resolved simulations of turbulence

Carlsson,

Wallin,

Girimaji

2024

Preprint

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A new formulation for scale-resolved simulations of turbulence with variable resolution (VR) is proposed. A delayed detached-eddy simulation (DDES) model based on the k − ω framework is extended with VR-terms representing the commutation terms arising from variable resolution defined in terms of the DDES length scale. The VR-terms are responsible for the exchange of turbulence kinetic energy between the resolved and unresolved partitioning of the computational representation of turbulent flow. The new formulation is implemented in a general-purpose CFD code and applied on two cases, namely, a mixing shear layer and a wall-mounted hump and have been compared with and combined with the baseline model and two additional grey-area mitigation (GAM) formulations. The proposed method is shown to provide the mechanism for the exchange of energy between unresolved and resolved representation of the flow and to enhance the transition from modelled to resolved turbulence and thus improve the prediction of the resolved Reynolds stresses, development of the vorticity thickness for the shear layer flow and the skin friction recovery length for the hump flow.

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Section: Introductionmentioning

confidence: 99%

Variable resolution in scale-resolved simulations of turbulence

Carlsson,

Wallin,

Girimaji

2024

Preprint

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“…Lagrangian particle trajectory models [20] and Lagrangian puff dispersion models [21] form the third group of advanced mathematical models. The last group includes the most sophisticated Computer Fluid Dynamics (CFD) models which can be divided to Reynolds-Averaged Navier-Stokes (RANS) models [22], Large Eddy Simulation (LES) models [23], and Direct Numerical Simulation (DNS) models [24]. As noted in the review [15] the most adequate description of multicomponent gas mixture movement can be possible only on the base of non-stationary Navier-Stokes equations, but limited capabilities of modern computers do not allow researchers to use direct solvers based on these equations effectively [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Wind Speed Influence on Accident Toxic Spill Consequences Scales

Skob,

Yakovlev,

Pichugina

et al. 2023

Environmental and Climate Technologies

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This study aims to evaluate numerically the influence of wind speed on scales of environmental harmful consequences caused by accidentally spilled toxic liquid evaporated from the surface of a free-form outlined spill spot. A coupled problem of the gas-dynamic movement of a toxic air-mixture cloud in the atmosphere’s surface layer under the influence of wind and a negative toxic inhalation impact on a human in an accident zone is solved by means of mathematical modelling and computer experiment. A three-dimensional non-stationary mathematical model of the turbulent movement of a gas-air mixture is used for obtaining distribution of relative mass concentration of toxic gas impurities in time and space. A probabilistic impact model based on using a modernized probit analysis method is used to obtain fields of conditional probability of a fatal human injury resulting from toxic gas inhalation. This technique allows environmental safety experts assessing the scale of considered type technogenic accident consequences numerically depending on wind speed conditions and elaborating the means to mitigate them to acceptable levels.

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“…Lagrangian particle trajectory models [22] and Lagrangian puff dispersion models [23] form an advanced group. The Sophisticated group is formed by Computer Fluid Dynamics (CFD) models: Reynolds-Averaged Navier-Stokes (RANS) models [24], Large Eddy Simulation (LES) models [25] and Direct Numerical Simulation (DNS) models [26]. The most adequate description of the physical processes of mixing non-reactive gases with air and the further propagation of the mixture in open space is possible only with the use of a system of nonstationary Navier-Stokes equations for compressible gas.…”

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation of Probability of Harmful Impact Caused by Toxic Spill Emergencies

Skob

Ugryumov

Granovskiy³

2019

Environmental and Climate Technologies

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The purpose of the work is to assess the degree of inhalation damage of a person exposed to the toxic cloud of liquefied gas evaporation from a spill spot of various shapes. The mathematical model of liquefied gas spill evaporation which arose as a result of accidental destruction of the storage capacity and further dispersion of the gas impurity in the atmosphere surface layer was developed. The computational technology for determining the fields of conditional probability of human inhalation damage by a toxic gas based on a probit analysis is developed. The mathematical model takes into account the flow compressibility, complex terrain, three-dimensional nature of the dispersion process, and the presence of toxic liquid substance evaporation from the arbitrary spill spot with varying intensity. The model allows obtaining space-time distributions of the toxic gas relative mass concentration and inhaled toxidosis which is necessary to determine the fields of the human damage probability based on the probit analysis. For different ellipticity of the hydrogen cyanide spill elliptical spot the fields of probability of human mortal damage are obtained and the influence of spot ellipticity on the scale of the consequences of an accident of this type is analysed. The developed technology allows carrying out automated analysis and forecasting in the time and space of the damage probability of a person exposed to the toxic gas as an indicator of the safety of the technogenic object.

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Interface methods for grey-area mitigation in turbulence-resolving hybrid RANS-LES

Cited by 11 publications

References 18 publications

Variable resolution in scale-resolved simulations of turbulence

Variable resolution in scale-resolved simulations of turbulence

Numerical Evaluation of Wind Speed Influence on Accident Toxic Spill Consequences Scales

Numerical Evaluation of Probability of Harmful Impact Caused by Toxic Spill Emergencies

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