[klausb]

Hello,

after completing the damper tutorial, I am trying to create an alternative mesh for an OpenFoam tutorial using enGrid.

When I try to import a stl geometry, I get the error message:

p, li { white-space: pre-wrap; } "The STL geometry could not be cleaned"


The same happened with an airfoil.stl I created.


What are the required settings?


Klaus

[ogloth]

STL is an awful format and most CAD programs fail to export water-tight STL files. Open-Cascade based software generally does a good job of this. Alternatively you can fix the geometry using Blender.

Feel free to post a geometry which fails and I'll have a look at night -- not before Monday, unfortunately.

Engrid badly needs an import function for CAD files without the detour via STL or any other mesh based format.

Regards,
Oliver

[klausb]

Hello,

the stl file is too large to post.

What I need is a stl file of the S809 airfoil with a span twice the chord. Find the coordinate file for the S809 airfoil attached.

Airfoil coordinate files describe the geometry for a chord of 1 which will be interpreted for my simulation as 1m so the span should be 2 (2m).

If the program can't handle coordinates ranging from 0 to 1, they can be multiplied by e.g. 100 or 1000. A correction factor can easily be set in OpenFoam.

How can such an stl be created?

Do you have plans to enable step or iges imports?

Klaus

[ogloth]

Hi Klaus,

I just had a look at your airfoil and it imports after changing the format slightly to match the Selig airfoil format. It can then be exported to Blender and within Blender a proper volume can be created with little effort.

Do you want your wing between two walls (symmetry planes), or do you want a proper wing tip?

I'll send you a file which you can import into enGrid later today or tomorrow, because there is loads of other work to do ...

Cheers,
Oliver

[klausb]

Hello,

my intention is to use enGrid to create the mesh for the S809 3D test case described in the ris-r-1581.pdf paper.

Paper download: http://http://www.findthatpdf.com/se...r-1581.pdf.htm

Klaus

[ogloth]

Hello,

here is the promised file. It is in the enGrid <-> Blender exchange format which can be directly imported into enGrid. Boundary codes have already been defined. Please note that the wing is split into an upper and lower part; this is important to keep the sharp trailing edge intact.

Cheers,
Oliver