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CFX Navier-Stokes Equation

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Old   May 30, 2016, 05:03
Default CFX Navier-Stokes Equation
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Yuva
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Hello Everyone

I have questions and I will highly appreciate if you help with

Do CFX use the finite volume technique to solve Navier-Stokes Equation of fluid flow problems ?

Is there any way to modify the N-S equations inside CFX ?

Is there any way to solve a simple Fluid flow problem using the Finite difference or the Finite Element method instead of the finite volume technique inside CFX

Thank you for your HELP
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Old   May 30, 2016, 06:41
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Quote:
Do CFX use the finite volume technique to solve Navier-Stokes Equation of fluid flow problems ?
Yes.

Quote:
Is there any way to modify the N-S equations inside CFX ?
When you select options like ideal gas, gravity, source terms etc etc you modify the NS equations used.

Quote:
Is there any way to solve a simple Fluid flow problem using the Finite difference or the Finite Element method instead of the finite volume technique inside CFX
You can do this by using a different CFD code or write your own. Inside CFX: No, you cannot change this.
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Old   May 30, 2016, 19:29
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Dear ghorrocks
Thank you very much for answering me
which technique do you think is the most efficient to write a program for solving N-S equations ?
and what is the most appropriate coding software : Matlab or C ++ or others ?
Thank you very much for your help
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Old   May 30, 2016, 21:08
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They all can do it. NS solvers are very complex and difficult to write (which is why people pay lots of money to buy them). But the exercise is highly recommended as you will learn a lot about how CFD solvers work. So you should use the programming language you are most familiar with.
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Old   May 30, 2016, 21:20
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Oh My God
DO you any idea How long will it take to write the code ?
Do you have any suggestion resources ( book title or website) for guiding to write N-S numerical Solver ?
Thank you for you help
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Old   May 31, 2016, 02:01
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Originally Posted by FAKHREDDINE View Post
DO you any idea How long will it take to write the code ?
About the same amount of time it takes for me to write a book.

No, seriously, it depends on how good you are at programming, and how much CFD you already know. Undergrad students usually learn the basic concepts within a a few weeks. I would suggest to start with a 2D code (a common example is the Lid-driven cavity) or if you want to do compressible flow, a "1D"-nozzle. I always recommend Andersson http://www.amazon.com/Computational-.../dp/0070016852 or Versteeg/Malalasekera http://www.amazon.com/Introduction-C.../dp/0131274988

Make sure to check out Prof Barba's excellent CFD course on youtube: https://www.youtube.com/watch?v=35unQgSaT88
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