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XFOIL - MATLAB interface

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XFOIL - MATLAB interface

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Class interface between XFOIL and MATLAB, with the ability of running many instances in parallel.

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Description

I developed this interface some time ago, so I finally decided to refine and make it available here. It provides an interface between XFOIL and MATLAB, creating the files required by XFOIL to run, and reading the results back in an easy to access polar structure.

As the goal was to perform airfoil optimization, this interface is capable of parallel execution, so that you can create multiple instances and run all at the same time, without blocking MATLAB. Also, it is possible to hide the plotting window, so XFOIL will not interrupt your work-flow while it is running.

A simple example script using an NACA 23012 is provided, showing the main features of the interface.

XFOIL is not included on this package, but the class will download and extract it for you automatically in case the XFOIL executable is not available in your path.

XFOIL is an analysis software provided by Prof. Mark Drela (from MIT), for the design and analysis of subsonic airfoils. For more info, check his website at http://web.mit.edu/drela/Public/web/xfoil/

Acknowledgements

Naca 4 Digit Airfoil Generator and Naca 5 Digit Airfoil Generator inspired this file.

MATLAB release MATLAB 7.11 (R2010b)
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Comments and Ratings (23)
05 Dec 2014 Gregory Vernon  
03 Dec 2014 H E

H E (view profile)

I've used XFOIL-MATLAB interface with R2014a with no problems, it's been great! However, I just upgraded to R2014b and, when reading my own airfoil .dat file, I get the error:

Error using textscan
HeaderLines must be integer-valued.

Error in Airfoil (line 35)
Coordinates = textscan(fid, '%f%f','HeaderLines',HasHeader,'MultipleDelimsAsOne',true);

Changing line 26 of Airfoil.m to "HasHeader=1" instead of "HasHeader=true" seems to fix the problem. I'm not sure why, as those two statements should be equivalent.

31 Oct 2014 Arash

Arash (view profile)

 
30 Jul 2014 SREEJITH

how can i develop interface for 'INTE'..?

29 Apr 2014 Lucas Augusto

hey, i'm having this problem:
>> exampleXFOIL
Cannot find an exact (case-sensitive) match for 'XFOIL'

The closest match is: xfoil in C:\Users\Lucas94\Documents\MATLAB\xfoil.m

Error in exampleXFOIL (line 2)
xf = XFOIL;
Could anyone help me?

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15 Jan 2014 Guilherme

Thanks for the awesome interface!

I am though, facing some issues when trying to paralell processing XFOIL in a program, using parfor loops. Could you give me some tips or a guide on how to simultaneosly run more than one airfoil analysis at the same time? Thanks!

02 Dec 2013 James

James (view profile)

I am a masters student of aeronautics at Durham finding this very useful, is it possible to print the tables of the results as i then need to to use the nubers to generate lift profiles. Any help would be great I am not all to familiar with matlab.

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08 Feb 2013 Brett Behrends

2 questions for you. I have been trying to get the program to print a pressure file, specifically a CPWR file. I saw that you already have the framework for it in the XFOIL.m file, but I'm have trouble getting the commands right. Also, I would like to cycle through a couple of different airfoils in the program. How would I do that?

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11 Oct 2012 Rafael Oliveira

Hi Matt,
To hide the xfoil window, just set (assuming x = XFOIL;)
x.Visible = false;
Any other doubts, drop me an email!

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11 Oct 2012 Matt Brown

Is there any way to supress the xfoil window? I implemented this into a loop and the repeated open/close of xfoil gets to be a bit much.

Other than that, good code!

03 Mar 2012 Rajesh Senthil Kumar  
21 Feb 2012 Mingyao

Hi Rafael,

I shot another email to your listed mailbox. Thanks.

Mingyao

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21 Feb 2012 Rafael Oliveira

Hi Mingyao,

The delete command in this case is used to delete the files whose names are stored in the cell array PolarFiles

This cell will have inside something like this:
PolarFiles = {'file1.txt', 'file2.txt', 'file3.txt'};

This is a common misunderstanding with MATLAB, about the difference between a cell array and a normal array of numbers, and how to access the elements. In the case of a cell array, you can access the content using {index}, and a sub-part of the cell as (index).
For example, let's say you have:
>> PolarFiles = {'file1.txt', 'file2.txt', 'file3.txt'};

Then, if you run:
>> PolarFiles(2)
ans = {'file2.txt'} % Returns a cell array with one element

>> PolarFiles{2}
ans = 'file2.txt' % Returns the string that was stored in the cell

If you have any further doubt, send me an email and I can answer you directly!

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20 Feb 2012 Mingyao

Hi, Rafael! Thank you for your response. I think what I don't really understand about the code is the 'delete' command. I tried a search in MATLAB Help, but the same command seems intended to delete files located in a folder or a handle object. If I simply try to delete a cell in the command window like this, MATLAB will complain. Could you please shed light on the subject? Thanks.

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20 Feb 2012 Rafael Oliveira

Hi! This part of the code is used to delete any polar files that might exist from previous runs, so that when XFOIL is run a few lines later, with:

PB=java.lang.ProcessBuilder(arg);
this.Process = PB.start;

We can be sure that the polar files are going to be created due to this run, and not previous results. This happens very often when making small modifications in the airfoil that affects the XFOIL convergence, so that you can have a mix of old and new results.

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18 Feb 2012 Mingyao

Would you be so kind as to explain what the following lines of your code do? Thanks.

warning('off','MATLAB:DELETE:FileNotFound')
for i=1:length(this.PolarFiles)
delete(this.PolarFiles{1})
end
warning('on','MATLAB:DELETE:FileNotFound')

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29 Nov 2011 Rafael Oliveira

Hi Matthias, I know I've already answered you, but I'll copy it here as a reference for other people:

xFlap = 0.6;
yFlap = 0;
FlapDeflection = 5;

xf = XFOIL;

% Create a NACA 5-series airfoil
xf.Airfoil = Airfoil.createNACA5('23012',150);

% Add a flap deflection to the airfoil
xf.addActions('GDES')
xf.addActions('FLAP')
xf.addActions(num2str(xFlap));
xf.addActions(num2str(yFlap));
xf.addActions(num2str(FlapDeflection));
xf.addActions(''); %Simulate an enter, to get out of GDES mode

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24 Nov 2011 Matthias

Thanks a lot,
could you help me with implementing trailing edge deflection?

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24 Nov 2011 Matthias  
28 Jul 2011 toto13000

I look that you kill Xfoil when it freezes.
Do you know that happen so that Xfoil freezes ?

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07 Mar 2011 Rafael Oliveira

I just implemented what I needed for my project, but you can use the XFOIL.addActions('') to send custom commands to it (just do what you want in an XFOIL section, and take note of the commands you typed).
If you have a list of commands you need, I can try to implement it into the class too...

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06 Mar 2011 sunil anandatheertha

Please include more of the common xfoil features .... Thx (:

Comment only
06 Mar 2011 sunil anandatheertha

thank you so much my friend. I saved a lotttttttttt of time using this.. Thnx. Big FAN (:

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