Computational Fluid Dynamics

Computational Fluid Dynamics

ABSTRACT:

CFD is the art of replacing the differential equation governing the Fluid Flow, with a set of algebraic equations called discretization, which in turn can be solved with the aid of a digital computer to get an approximate solution. The advent of high-speed and large-memory computers has enabled CFD to obtain solutions to many flow problems including those that are compressible or incompressible, laminar or turbulent, chemically reacting or non-reacting. Computational Fluid Dynamics (CFD) has grown from a mathematical curiosity to become an essential tool in almost every branch of fluid dynamics, from aerospace propulsion to weather prediction. CFD is commonly accepted as referring to the broad topic encompassing the numerical solution, by computational methods, of the governing equations which describe fluid flow, the set of the Navier-Stokes equations, continuity and any additional conservation equations, for example energy or species concentrations. As a developing science, Computational Fluid Dynamics has received extensive attention throughout the international community since the advent of the digital computer. The attraction of the subject is twofold. Firstly, the desire to be able to model physical fluid phenomena that cannot be easily simulated or measured with a physical experiment, for example weather systems or hypersonic aerospace vehicles. Secondly, the desire to be able to investigate physical fluid systems more cost effectively and more rapidly than with experimental procedures. Nowadays there are various software’s like CFX 4/5, Fluent, Phoenics and Star CD to simulate the flow conditions. In this paper the governing equations to express fluid flow and applications of CFD for various fields are explained. A case study of airflow modeling is also included in paper.


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