1,721,100 research outputs found
Computational Methods in Wind Engineering
No full textIn wind engineering, in parallel to all other engineering disciplines, the impact of computational methods is rapidly increasing. As far as computational aspects are concerned, wind engineering embodies a series of specific challenges, including the availability of suitable validation data, the definition of boundaries and boundary conditions, scale disparities, and fluid–structure interaction. The present Special Issue shows recent advances in the development and application of computational methods in wind engineering
Sinc collocation method for solving the Benjamin-Ono equation
Get PDFWe propose a simple, though powerful, technique for numerical solutions of the Benjamin-Ono equation. This approach is based on
a global collocation method using Sinc basis functions. Some properties of the Sinc collocation method required for our subsequent
development are given and utilized to reduce the computation of the Benjamin-Ono equation to a system of ordinary differential
equations.The propagation of one soliton and the interaction of two solitons are used to validate our numericalmethod.Themethod
is easy to implement and yields accurate results.Edson Pindza is thankful to Brad Welch for the financial
support from RidgeCape Capital.http://www.hindawi.com/journals/jcmp/am201
Heat Transfer Enhancement of Laminar Flow of Ethylene Glycol through a Square Channel Fitted with Angular Cut Wavy Strip
No full textAbstractThe numerical friction factor and Nusselt number data for laminar flow through a square channel fitted with angular cut wavy tape has been presented. Fixed angles of 45o angular cut wavy tape were used as swirl flow generators inside the square channel. The angular cut wavy tape inserts with different wave ratio (y = 1.0, 3.0, 4.5), have been investigated for different inlet velocity. The computations were conducted with Reynolds number ranging from 100 to 2000 using ethylene glycol (Pr = 150) as the working fluid. The thermohydraulic performance has been evaluated. Use of angular cut wavy tape leads to considerable increase in heat transfer when compared with no angular cut wavy tape. The overall enhancement ratio has been calculated in order to discuss the overall effect of the angular cut twisted tape. This result is useful for the design of solar thermal heaters and heat exchangers
Finite element analysis of confined turbulent swirling flows
No full textThe finite element method is applied to incompressible and statistically steady confined turbulent swirling flows. A velocity–pressure formulation is employed. The momentum and continuity equations are solved using a segregated algorithm. Two turbulence models, namely the standard κ–ε model and the algebraic stress model, are considered. It is shown that the algebraic stress model leads to significantly more accurate results in swirling flows compared to the κ–ε model. A novel way of implementing the algebraic stress model is presented in which the stresses are coupled to the Navier–Stokes equations in such a way that they ‘correct’ the effective viscosity hypothesis. This formulation seems to provide a convenient approach for finite elements. In deriving the discretization equations, a streamline‐upwind/Petrov–Galerkin method is employed. Comparisons performed between various upwind schemes show that the numerical solution may be substantially affected by the particular upwind procedure used. The analysis is extended to the prediction of particle motion in turbulent swirling flow fields. Here the fluid turbulence is modelled adopting a stochastic approach. The influence of turbulence modelling on particle movement is investigated
A finite element solution of radiative heat transfer in participating media utilizing the moment method
No full textComputation Special Issue Reprint: Computational Methods in Wind Engineering
No full textIn wind engineering, in parallel to all other engineering disciplines, the impact of computational methods is rapidly increasing. As far as computational aspects are concerned, wind engineering embodies a series of specific challenges, including the availability of suitable validation data, the definition of boundaries and boundary conditions, scale disparities, and fluid–structure interaction. The present Special Issue shows recent advances in the development and application of computational methods in wind engineering
Finite element solution of an enclosed turbulent diffusion flame
No full textA finite element formulation of enclosed turbulent diffusion flames is presented. A primitive variables approach is preferred in the analysis. A mixed interpolation is employed for the velocity and pressure. In the solution of the Navier‐Stokes equations, a segregated formulation is adopted, where the pressure discretization equation is obtained directly from the discretized continuity equation, considering the velocity‐pressure relationships in the discretized momentum equations. The state of turbulence is defined by a κ–ϵ model. Near solid boundaries, a wall function approach is employed. The combustion rates are estimated using the eddy dissipation concept. The expensive direct treatment of the integrodifferential equations of radiation is avoided by employing the moment method, which allows the derivation of an approximate local field equation for the radiation intensity. The proposed finite element model is verified by investigating a technical turbulent diffusion flame of semi‐industrial size, and comparing the results with experiments and finite difference predictions
Investigation into the finite element analysis of confined turbulent flows using a κ-ε model of turbulence
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