1. Introduction A great variety of flows with importance to practical engineering applications are inherently unsteady and virtually all of the Newtonian fluid flows in nature are turbulent. Therefore, it is natural and unavoidable to deal with unsteady turbulent flows when Computational Fluid Dynamics (CFD) techniques are applied to engineering design and industrial use. CFD for general fluid ...

Aerodynamic performances may be optimised by the appropriate tuning of Active Flow Control (AFC) parameters. For first time, we couple Genetic Algorithms (GA) with an unsteady Reynolds-Averaged Navier-Stokes (RANS) solver using Spalart-Allmaras (SA) turbulence model to maximise lift and aerodynamic efficiency airfoil in stall conditions [1], then validate resulting set optimal Synthetic Jet Act...

We present an algorithm for compressible Large Eddy Simulation (LES) using unstructured tetrahe-dral grids. Two methods for simulation of the sub-grid scale stresses are examined. The rst method is the Monotone Integrated Large Eddy Simulation (MILES) technique of Boris, Oran and Grinstein, whereby the energy transfer from the resolved scales to the subgrid scales is modeled using the inherent ...

Bulk carriers have an important role in international maritime transport. In this paper, we carried out a numerical study on a model of bulk carrier vessel and calculated total resistance of the model. A model of a bulk carrier vessel with length of 2.76 m, breadth of 0.403 m and draught of 0.173 m was selected for numerical modeling. Numerical work was done by commercial CFD software ANSY...

One of the newest of viscoelastic RANS turbulence models for drag reducing channel flow with polymer additives is studied in different flow and rheological properties. In this model, finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model is used to describe the viscoelastic effect of polymer solution and turbulence model is developed in the k-ϵ-(ν^2 ) ̅-f framework. The geome...

Abstract Extreme waves acting on the floating vessel would cause serious physical behavior and could a catastrophic incident. Such phenomena should be put of high interest during designing step vessel. The numerical CFD (Computational Fluid Dynamics) viscous fluid approach along with recent development computer hardware gives us advantages to simulate huge number scenarios in very early design ...

_q}:anslation memories are t)ronfising devi('es for artt;omati(t ransla t ion. Thei r main weakuess, however, is poor coverage, on llllSeell {;ex|;. ]ill this t)at)er, l;he use of a hierarchical l;ranslat ion memory, (:onsisting of a ('as(:ade of finite si;~d;e t ransducers , is t)rot)os(;d. A mmfl)er of tr~nsdu(:e, rs is al)l)]ied to (;onverl; s(;ni;enee 1)airs fl:om a t)ilingual cortms into t...

Particle dispersion in a periodic channel is studied using the elliptic relaxation hybrid RANS/LES (ER-HRL) model. This approach employs four-equation linear eddy viscosity (LEV) model while Reynolds Averaged Navier-Stokes (RANS) mode near wall, and switches to LES Smagorinsky dynamic outer flow region. We perform systematic analysis of six sets particles having Stokes numbers St = 0.2, 1, 5, 1...