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A simplified model to estimate nonlinear turbulent transport by linear dynamics in plasma turbulence
Scientific Reports, 2023 A simplified model to estimate nonlinear turbulent transport only by linear calculations is proposed, where the turbulent heat diffusivity in tokamak ion temperature gradient(ITG) driven turbulence is reproduced for a wide parameter range including near-
Tomonari Nakayama +5 more
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Frontiers in Astronomy and Space Sciences, 2023 The distribution of turbulence in the heliosphere remains a mystery, due to the complexity in not only modeling the turbulence transport equations but also identifying the drivers of turbulence that vary with time and spatial location.
Bingbing Wang +8 more
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On the Conservation of Turbulence Energy in Turbulence Transport Models
The Astrophysical Journal, 2022 Abstract Zank et al. developed models describing the transport of low-frequency incompressible and nearly incompressible turbulence in inhomogeneous flows. The formalism was based on expressing the fluctuating variables in terms of the Elsässar variables and then taking “moments” subject to various closure hypotheses.
B.-B. Wang +3 more
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On the modeling of the transport of particles in turbulent flows [PDF]
ESAIM: Mathematical Modelling and Numerical Analysis, 2004 Summary: We investigate different asymptotic regimes for Vlasov equations modeling the evolution of a cloud of particles in a turbulent flow. In one case we obtain a convection or a convection-diffusion effective equation for the concentration of particles. In the second case, the effective model relies on a Vlasov-Fokker-Planck equation.
Goudon, Thierry, Poupaud, Frédéric
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Supersonic Combustion Modeling and Simulation on General Platforms
Aerospace, 2022 Supersonic combustion is an advanced technology for the next generation of aerospace vehicles. In the last two decades, numerical simulation has been widely used for the investigation on supersonic combustion.
Shizhuo Huang +4 more
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Spectral transport model for turbulence
Theoretical and Computational Fluid Dynamics, 1990 The spectrum of inhomogeneous turbulence is modeled by an approach that is not limited to regimes of large Reynolds numbers or small mean-flow strain rates. In its simplest form and applied to incompressible flow, the model depends on five phenomenological constants defining the strength of the turbulence coupling to mean flow, turbulence transport in ...
D Besnard +3 more
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Frontiers in Earth Science, 2023 Multiscale numerical weather prediction models transition from mesoscale, where turbulence is fully parameterized, to microscale, where the majority of highly energetic scales of turbulence are resolved. The turbulence gray-zone is situated between these
David J. Wiersema +9 more
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Self-organization and nonlocal nature of geophysical turbulence and planetary boundary layers
Геофизический журнал, 2010 The classical paradigm of the theory of turbulence states that any turbulent flow can be considered as a superposition of the fully organized mean motion and the fully chaotic turbulence is characterized by the direct energy cascade (from larger to ...
S. S. Zilitinkevich
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Evaluation of influence of turbulence models on the vortex formation processes modeling in wind power [PDF]
Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2022 The paper studies the results of mathematical modeling of the external flow of Siemens 3D model SWT3.6120 (B52 air foil) horizontal axis wind turbine (HAWT), using the NavierStokes equations averaged by Reynolds (RANS) closed byk,kShear Stress Transport (
Evgeny V. Solomin +7 more
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CFD Validation of Wall Laws in K-ω SST Model for Adverse Pressure Gradient-Free Downward Flow [PDF]
E3S Web of Conferences, 2023 This study introduces a validation investigation employing Computational Fluid Dynamics (CFD) to assess the utilization of the Consistent Wall Law (CWL) in tandem with the K-Shear Stress Transport (SST) turbulence model, specifically in scenarios ...
Belhadad Tarik +3 more
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