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  2. K-epsilon turbulence model - Wikipedia

    en.wikipedia.org/wiki/K-epsilon_turbulence_model

    K-epsilon (k-ε) turbulence model is one of the most common models used in computational fluid dynamics (CFD) to simulate mean flow characteristics for turbulent flow conditions. It is a two equation model that gives a general description of turbulence by means of two transport equations ( partial differential equations , PDEs).

  3. Turbulence modeling - Wikipedia

    en.wikipedia.org/wiki/Turbulence_modeling

    The model attempts to predict turbulence by two partial differential equations for two variables, k and ω, with the first variable being the turbulence kinetic energy (k) while the second (ω) is the specific rate of dissipation (of the turbulence kinetic energy k into internal thermal energy). SST (Menter’s Shear Stress Transport)

  4. Kolmogorov microscales - Wikipedia

    en.wikipedia.org/wiki/Kolmogorov_microscales

    where ε is the average rate of dissipation of turbulence kinetic energy per unit mass, and; ν is the kinematic viscosity of the fluid.; Typical values of the Kolmogorov length scale, for atmospheric motion in which the large eddies have length scales on the order of kilometers, range from 0.1 to 10 millimeters; for smaller flows such as in laboratory systems, η may be much smaller.

  5. Menter's Shear Stress Transport - Wikipedia

    en.wikipedia.org/wiki/Menter's_Shear_Stress...

    Menter's Shear Stress Transport turbulence model, or SST, is a widely used and robust two-equation eddy-viscosity turbulence model used in Computational Fluid Dynamics.The model combines the k-omega turbulence model and K-epsilon turbulence model such that the k-omega is used in the inner region of the boundary layer and switches to the k-epsilon in the free shear flow.

  6. Turbulence kinetic energy - Wikipedia

    en.wikipedia.org/wiki/Turbulence_kinetic_energy

    Physically, the turbulence kinetic energy is characterized by measured root-mean-square (RMS) velocity fluctuations. In the Reynolds-averaged Navier Stokes equations, the turbulence kinetic energy can be calculated based on the closure method, i.e. a turbulence model.

  7. Brian Launder - Wikipedia

    en.wikipedia.org/wiki/Brian_Launder

    The -model introduced by W. P. Jones and Launder is considered to be the most popular -model in the turbulence modelling community. [1] They introduced this model in the 1972 paper titled " The prediction of laminarization with a two-equation model of turbulence " and is often referred to as the Standard k {\displaystyle k} - ϵ {\displaystyle ...

  8. Energy cascade - Wikipedia

    en.wikipedia.org/wiki/Energy_cascade

    where u i are the components of the fluctuating velocity, the overbar denotes an ensemble average, summation over i is implied, and k is the wavenumber. The energy spectrum, E(k), thus represents the contribution to turbulence kinetic energy by wavenumbers from k to k + dk. The largest eddies have low wavenumber, and the small eddies have high ...

  9. Category:Turbulence models - Wikipedia

    en.wikipedia.org/wiki/Category:Turbulence_models

    Turbulence models use different methods to model fluctuations inherent in the full Navier-Stokes equations. They are used because the use of the full Navier-Stokes equations is normally computationally impractical.