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Doublet Lattice FORTRAN code

  1. Aug 14, 2005 #1
    Hello everybody,
    I need a FORTRAN code (the source code) with the capability to calculate the generalized aerodynamic matrices given the modes of the structure. In particular, I need a code that is able to handle 3D structures made by assembling trapezoidal plate elements.
    Does anyone have/know about codes able to solve my problem? I need the source code in FORTRAN. Please help me!
  2. jcsd
  3. Aug 16, 2005 #2
    Nobody knows a good unsteady aerodynamic code that solves my problem?
  4. Aug 19, 2005 #3
    Nobody works with unsteady aerodynamcs?
  5. Aug 30, 2005 #4
    Please! Your help is very apreciated!
  6. Aug 30, 2005 #5


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    This is difficult to answer because it would probably involve some proprietary software.

    I believe CFX (http://www-waterloo.ansys.com/cfx/ [Broken]) and Star-CD (http://www.cd-adapco.com/products/starsolver.htm), which are both CFD codes, are written in FORTRAN. They are generic CFD and IIRC have some fluid-structure interaction capability. I am not sure if the source code is available, even if only a specific module.

    Otherwise, the aircraft manufacturers like Boeing and Lockheed have their own proprietary software and you would be unlikely to get the FORTRAN.

    Contact ANSYS and Adapco to see what you might be able to obtain.
    Last edited by a moderator: May 2, 2017
  7. Aug 30, 2005 #6
    Thank you. I really need the source code...
  8. Aug 30, 2005 #7


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    .... been looking at the post for a while but haven't come up with anything really good, could you elaborate a bit on the actual problem & what implementations in detail you'd be needing?

    Meaning, do you require the whole scheme starting from model generation etc. ? Or some "bits and pieces" like the specific solver part etc. Might try to patch something.
  9. Aug 30, 2005 #8
    Thank you for your question. I explain what I need with the simplest case. Suppose I have a non-planar wing configuration such as a biplane with (just for simplicity) rectangular wings. Suppose that I like to perform the unsteady subsonic (incompressible is fine) aerodynamic analysis by using a good doublet lattice code. This code should be able to take the natural modes (for example the first 20 modes) and calculates the generalized aerodynamic matrices (in the frequency domain) given a set of (for example 10) reduced frequencies. So, the doublet lattice code I need should be in FORTRAN, and should be able to hundle this case (or similar non-planar configurations). I must have the source code of it because I have to integrate it in a much more complex aeroelastic code.
    Thank you,
  10. Sep 2, 2005 #9


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    Last edited by a moderator: Apr 21, 2017
  11. Sep 2, 2005 #10
    Thank you for your links, but I did not find the source code in FORTRAN of a doublet lattice code. I only found a vortex lattice code which is unuseful because I have written a vortex lattice code and now I need the unsteady part.
  12. Sep 2, 2005 #11


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    Yep, I noticed the same. I'll dig a bit deeper into a couple of source repositories, perhaps will get lucky.
  13. Mar 13, 2006 #12
    Nobody knows? I think that this code could be useful for all the comunity
  14. Apr 24, 2006 #13
    unsteady subsonic aerodynamics

    We have just the same problem. Seeking for a code (preferentially but not necessarily FORTRAN), we were delighted to find the forum. All we know is that "a big European aircraft manufacturer" has recently given a contract to a software developper to write a code for unsteady subsonic aerodynamics for bodies which are not "infinitly thin", that means thick airfoils, nacelles, and fuselages.

    We would highly appreciate any information about an accessible code or at least papers where the theory is fully explained. We are not in a hurry and could envisage to start our own programmation - and why not in cooperation with others?

    G. Kretzschmar
    Last edited: Apr 24, 2006
  15. Apr 24, 2006 #14
    Hello Kretzschmar,
    I know a very good report about DLM. It is detailed for PLANAR wings (no 3D configurations that I would need). The report is


    Max Blair
    Last edited: Apr 24, 2006
  16. Apr 24, 2006 #15


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    One pretty recent online source came about & might be of some use:

    http://www.smr.ch/local/doc/reports/ws2002/PaulArendsen.pdf [Broken]
    Last edited by a moderator: May 2, 2017
  17. Apr 25, 2006 #16
    Thank you PerennialII. But I have problems to see the PDF. It has a lot of strange characters and formulas are bad. Is it the version of my ACROBAT (6.0)? Can you read it well? Which ACROBAT reader do you have? Thank you!
  18. Apr 26, 2006 #17


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    .... I've 7.0.7 and it looks good, equations and all. Probably easiest to try to upgrade.
  19. Apr 26, 2006 #18
    Thank you. But what I really need is at least a detailed theory about the nonplanar case. For example, the paper I posted is amazing for the planar case only.

    Anyway, I am going to upgrade my acrobat soon.
  20. Jun 26, 2006 #19
    I decided to write my own doublet lattice code for nonplanar surfaces with zero thickness.
    I need from you an help for the SYMMETRY condition (I like to model half airplane!). How do I do that? For the vortex lattice I know it, but for the doublet lattice case I am not so sure.
  21. Feb 16, 2007 #20
    I had to postpone work on the topic for a long time. Now I am back to the forum and would like to thank the colleagues for their help by communicating useful references.


    G. Kretzschmar
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