Exporting microCT reconstructions to ANSYS

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Exporting microCT reconstructions to ANSYS

Jacob Sebastian Mealy
Hello all,

I've been wrestling with this problem for a while now and I wonder if
anyone can help me. I have a stack of images from a microCT scan of a
porous tissue engineering scaffold and I want to turn them into a geometry
or mesh that I can do a fluid dynamics analysis on in ANSYS Fluent. Using
the 3D viewer plugin I can turn my stack into a surface but the only
options for export are as Wavefront or DXF files. And I'm having trouble
getting either into ANSYS. Does anyone have any suggestions for a different
way to go about this? Or a way to create an ANSYS-friendly geometry? Any
help would be greatly appreciated.

Kind regards,

Jake Mealy

Ph.D. Student
Trinity Centre for Bioengineering
Trinity College Dublin
Dublin 2
Ireland
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Re: Exporting microCT reconstructions to ANSYS

Gabriel Landini
On Thursday 26 Apr 2012 10:39:16 you wrote:
> the 3D viewer plugin I can turn my stack into a surface but the only
> options for export are as Wavefront or DXF files.

The 3DViewer version I have has can export surfaces as Wavefront, DXF, STL and
U3D. Would any of those help?

Cheers
G.
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Re: Exporting microCT reconstructions to ANSYS

Jacob Sebastian Mealy
Hi Gabriel,

Thanks for your response. Unfortunately, not really. The only ImageJ
filetype that ANSYS recognises is DXF and everytime I try to import using
that, the program crashes. I've also tried importing the surface to CREO
1.0 and trying to go from there to ANSYS but again all I get is an error
message saying "No valid bodies found".

Cheers

Jake

On 26 April 2012 11:25, Gabriel Landini <[hidden email]> wrote:

> On Thursday 26 Apr 2012 10:39:16 you wrote:
> > the 3D viewer plugin I can turn my stack into a surface but the only
> > options for export are as Wavefront or DXF files.
>
> The 3DViewer version I have has can export surfaces as Wavefront, DXF, STL
> and
> U3D. Would any of those help?
>
> Cheers
> G.
>
>
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AW: Exporting microCT reconstructions to ANSYS

Jörg Hammel
In reply to this post by Jacob Sebastian Mealy
Hi Jake,

If you already have your surface created in ImageJ saved as wavefront (.obj)
file, you can simple convert it to .stl format using "Meshlab" (Freeware)
which can be read by ANSYS ICEM CFD or TGrid for preprocessing in order to
generate your grid file. Just open your .obj file in Meshlab and save it as
.stl. You probably might face some difficulties with the quality of your stl
file. However, to my experience meshing in TGrid is very robust and might
give you a fairly good grid for your simulation study.

Best

                 Jörg

_________________________________________________
Dr. Jörg U. Hammel
Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem
Museum
Erbertstr. 1
07743 Jena

T:  +49 3641 949173
M: [hidden email]

www.porifera.net
www.uni-jena.de/szeb.html
-----Ursprüngliche Nachricht-----
Von: ImageJ Interest Group [mailto:[hidden email]] Im Auftrag von Jacob
Sebastian Mealy
Gesendet: Donnerstag, 26. April 2012 11:39
An: [hidden email]
Betreff: Exporting microCT reconstructions to ANSYS

Hello all,

I've been wrestling with this problem for a while now and I wonder if anyone
can help me. I have a stack of images from a microCT scan of a porous tissue
engineering scaffold and I want to turn them into a geometry or mesh that I
can do a fluid dynamics analysis on in ANSYS Fluent. Using the 3D viewer
plugin I can turn my stack into a surface but the only options for export
are as Wavefront or DXF files. And I'm having trouble getting either into
ANSYS. Does anyone have any suggestions for a different way to go about
this? Or a way to create an ANSYS-friendly geometry? Any help would be
greatly appreciated.

Kind regards,

Jake Mealy

Ph.D. Student
Trinity Centre for Bioengineering
Trinity College Dublin
Dublin 2
Ireland
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Re: Exporting microCT reconstructions to ANSYS

Michael Doube-3
In reply to this post by Jacob Sebastian Mealy
Hi Jacob

> the 3D viewer plugin I can turn my stack into a surface but the only
> options for export are as Wavefront or DXF files.

You must have an old 3D viewer: we added STL export support ages ago.

Update your 3D viewer from:
http://3dviewer.neurofly.de/

And you will get the menu items File > Export Surfaces As... STL (ascii)
and STL (binary) in the 3D Viewer menus.

I can recommend the binary format for the simple reason that the files
are much much smaller.

Cheers,

Michael
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Re: Exporting microCT reconstructions to ANSYS

Jacob Sebastian Mealy
Jörg,
I was actually already using MeshLab to convert to STL but I never thought
of using TGrid to mesh (I was trying to use the inbuilt mesher in
Workbench). Looks like I'm already getting some workeable meshes out of it
so thanks a million for that suggestion, you've made my day!

Michael,
Thanks for that, I've updated and can now export traight to STL, great to
cut out a step in the process.

To everyone else,
My apologies for using the ImageJ list to solve a CFD meshing problem!

Thanks again.

Jake Mealy
Ph.D. Student
Trinity Centre for Bioengineering
Trinity College Dublin
Dublin 2
Ireland

On 26 April 2012 15:34, Michael Doube <[hidden email]> wrote:

> Hi Jacob
>
> > the 3D viewer plugin I can turn my stack into a surface but the only
> > options for export are as Wavefront or DXF files.
>
> You must have an old 3D viewer: we added STL export support ages ago.
>
> Update your 3D viewer from:
> http://3dviewer.neurofly.de/
>
> And you will get the menu items File > Export Surfaces As... STL (ascii)
> and STL (binary) in the 3D Viewer menus.
>
> I can recommend the binary format for the simple reason that the files
> are much much smaller.
>
> Cheers,
>
> Michael
>
>
>