# What is CFD

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 July 21, 1999, 14:12 What is CFD #1 PhD Student in Aero Eng Guest   Posts: n/a Hello I was hoping that someone could explain what CFD is to me please. Thanks in advance.

 July 21, 1999, 14:44 Re: What is CFD #2 Patrick Godon Guest   Posts: n/a How can one be a PhD student in Aeronautics and not know what is CFD? Computational Fluid Dynamics (CFD) will help you to find what is the lift and drag on the wings of your plane (airfoil NACA 0012, why not?) by modeling the flow of air around the wings using numerical models (computer simulations) that solve the equations of the flow.

 July 21, 1999, 16:17 Re: What is CFD #3 clifford bradford Guest   Posts: n/a I too am curious how a man can be phd student and not have an inkling waht cfd is. cfd is any technique by which the performance of a fluid sytem can be estimated/predicted by use of computer programs. since you're an aero engineer you'd (and most of the readers of this group) would be interested in simlating flow over aircraft or inside aircraft engines (myself). however cfd in various forms is also useful for piping design, heat exchanger design, design of hydro-pneumatic systems etc. learn about it man. it's the future

 July 21, 1999, 17:34 Re: What is CFD #4 John C. Chien Guest   Posts: n/a (1). First of all, there is no unique definition of "CFD". (2). You can say that everyone has is own definition of "CFD". My car is a car, and your car is a car. But "my CFD" is definitely not the same as "someone's CFD". How could this happen? (3). This is because "CFD" is still in it's early stage of development. For example, if you graduate from a medical school, you are a medical doctor, a working medical doctor. (4). If you get a PhD on a new and more efficient method to solve Navier-Stokes equations, can you design an aircraft? or an engine? Unlikely! (5). Or if your PhD dessertation is on mesh generation or near-wall turbulence model, are you still an aerospace engineer? (6). Maybe, you were lucky and were able to use a commercial code in your dessertation. But the company trying to hire you does not have that code, what are you going to do? What is the company going to do? (7). These are sample reasons why "CFD" is not uniquely defined. (8). But, I can tell you what people in industries are doing with "CFD". In aircraft and engine industries, CFD codes to solve flow equations at various degrees of complexity are being used to obtain design information to support new product (new aircrafts, new engines) design, and existing product services. While twenty or thirty years ago, these activities were carried out using slide rules, analytical solutions, empirical formula and wind tunnel testing. (9). In general, the elements involved in "CFD" is parallel to the processes involved in wind tunnel testing, except that most activities are carried out on computer. ( computer geometric modeling, computer mesh generation, computer solution of Navier-Stokes equations, Euler equation, computer graphic animation of computed solutions)

 July 22, 1999, 03:20 Re: What is CFD #5 Nuray Kayakol Guest   Posts: n/a Or (6). Maybe, you were unlucky and were able to write a commercial code in your dessertation. But the company trying to hire you have that code, what are you going to do? This is also another problem for anyone.

 July 26, 1999, 08:40 Re: What is CFD #6 Axel Rohde Guest   Posts: n/a I have a free educational CFD program for download at www.cfd4pc.com which you should try. I think this will give you an idea about CFD!

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