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CFD code structure (F90)

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Old   December 16, 2004, 22:47
Default CFD code structure (F90)
  #1
ma
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I've read and written several CFD codes in Fortran, and come to know that the code structure is quite important as the code goes large. The commercial CFD codes may have a good structure but we have no chance to read them.

I am wondering how you guys construct your CFD code, particularly, TVD code for compressible reacting flow?

As for my self, several years ago, I put every thing in a single file and have a lot of "/common/...".

Later, I use a separte file, usually named PubVar.mod, to define public variables, and USE this module in the main code, which is a new attribute of Fortran 90.

Later, I found it is good to add another modue, usually named "GovEqu.mod" to encapsulate those related with governing equations, e.g., it may include subroutines like Get_Q(Q,p,T,u), Put_Q(Q,p,t,u), Get_E(Q,E), etc. The code sounds like having a "modular" structure.

Now I am going to add chemical reaction to such an existing code and have 3 options: (1) add to the main code (2) add to the GovEqu.mod (3) establish a new Chemistry.Mod

So what are your preference? Any discussion about how to improve a CFD code structure is welcome.

- ma
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Old   December 19, 2004, 09:29
Default Re: CFD code structure (F90)
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Saad
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I think you should try the object-oriented programming approach. You can use C++. OOPs is I think one of the best ways of program organisation.

Saad
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Old   December 21, 2004, 10:52
Default Re: CFD code structure (F90)
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David
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ma,

You can also use Fortran 95(2000?). Though, there are some limitations with it (inheritance)

For example:

http://www.lanl.gov/Caesar/ http://w3.pppl.gov/~pletzer/papers-reports/OOP-95/ http://www.cs.rpi.edu/~szymansk/oof90.html http://www.physics.ucla.edu/icnsp/Ht...ton/norton.htm

Also the following paper describes NASA converting a legacy fortran 77 (FUN3D) code to Fortran: Collaborative Software Development in Support of Fast Adaptive AeroSpace Tools (FAAST), Kleb et. al. 2003 http://fun3d.larc.nasa.gov/publicati...faast_software

Dave
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Old   December 23, 2004, 13:00
Default Re: CFD code structure (F90)
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ma
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Thanks for your suggestions. The above reference website is good.

- ma
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Old   January 10, 2005, 21:47
Default Re: CFD code structure (F90)
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Bil Kleb
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RE: FUN3D publications link

Better to use the main FUN3D site:

http://fun3d.larc.nasa.gov

as the names of the subpages are in flux.

Regards, -- Bil
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