A large-eddy simulation (LES) based meshless model is developed for the three-dimensional (3D) problem of continuous casting (CC) steel billet. The local collocation method on radial basis functions (RBF) applied in 3D. applies scaled multiquadric (MQ) RBF with a shape parameter seven nodded sub-domains. incompressible turbulent fluid flow described using mass, energy, and momentum conservation...

При моделировании турбулентных течений неизбежно приходится сталкиваться с выбором между точностью и скоростью проведения расчетов. Так, DNS- LES-модели позволяют проводить более точные расчеты, но являются вычислительно затратными, чем RANS-модели. Поэтому сейчас RANS- модели наиболее часто используемыми при проведении практических Но расчеты применением RANS-моделей могут быть значительно зат...

Recent advances in the theory of turbulent solutions of the Navier-Stokes equations are discussed and the existence of their associated invariant measures. The statistical theory given by the invariant measures is described and associated with historically-known scaling laws. These are Hack’s law in one dimension, the Bachelor-Kraichnan law in two dimensions and the Kolmogorov’s scaling law in ...

Computational Fluid Dynamics (CFD) has become a useful tool for the study of indoor and outdoor environment problems. Recently, the Massachusetts Institute of Technology (MIT) has developed several Reynolds Averaged Navier-Stokes (RANS) equation models and Large Eddy Simulation (LES) models to enhance the capabilities of CFD for use in indoor and outdoor environment design. The new models have ...

A new CFD RANS based method to predict the far field sound pressure emitted from an aerofoil with serrated trailing edge has been developed. The model was validated by comparison to measurements conducted in the Virginia Tech Stability Wind Tunnel. The model predicted 3 dB lower sound pressure levels, but the tendencies for the different configurations were predicted correctly. Therefore the mo...

The tip-clearance size of compressor rotors has a big effect on both performance and off-design conditions. Increasing the value tip gap can lead to reduction in efficiency surge margin about 1 %. Mechanical constraints impose minimal clearance order for operate while further would generally be beneficial aerodynamically. However, sensitivity show more complex tendencies. For example, some stud...

Over the past two decades, computational fluid dynamics and particularly the finite volume method have been increasingly used to predict the performance of wind turbines within their environment. Increases in available computational power has led to the application of RANS-based models to more and more complex flow problems and permitted the use of LES-based models where previously not possible...

Simulations of compressible boundary layer flow at three different Reynolds numbers (Reδ = 5.59×10, 1.78×10, and 1.58×10) are performed using a hybrid large-eddy/Reynoldsaveraged Navier-Stokes method. Variations in the recycling/rescaling method, the higherorder extension, the choice of primitive variables, the RANS/LES transition parameters, and the mesh resolution are considered in order to a...