When DesignModeler is a better choice than SpaceClaim

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peteroznewman posted this 30 January 2018

Rochester Institute of Technology Clean Snowmobile Team is an ANSYS sponsored team using Forte to predict engine emissions. RIT obtained the solid geometry from the engine manufacturer as a SOLIDWORKS (SW) file. I volunteered to help with geometry preparation to extract the fluid domain and partition the surfaces to make it ready for import into Forte. 
Eric Oswald is a fifth year Mechanical Engineering student who is doing the Forte simulations.

Both DesignModeler (DM) and SpaceClaim (SC) can do the Fill operation to create a solid model of the fluid domain, but an important difference was revealed. DesignModeler and SOLIDWORKS both use the Parasolid geometry modeling kernel, while SpaceClaim uses the ACIS kernel. That means moving data from SW to DM is just a write and read operation, while moving data from SW to SC is a write, read and translate operation. Most of the time, this translation between the two kernels has no effect, but sometimes it causes a problem.

Below is the image of the inlet port as seen in DM and it looks the same in SW.

Here is the image of the inlet port as seen in SC. Note the spike defect just right of center.

In this case, I decided to use DesignModer to complete the geometry preparation!

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vganore posted this 30 January 2018

Interesting story Peter. Is it difficult to fix the defect in SC or we can't fix it?

Vishal Ganore, ansys.com/student

peteroznewman posted this 30 January 2018

Hi Vishal, I tried the repair tools in SC but could not fix the defect. Attached is an ANSYS 18.2 archive of the geometry in DM and SC if anyone wants to try. The defect in the attachment looks different than shown above. Maybe the one above is after attempting a repair.

Attached Files

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vganore posted this 15 March 2018

Thanks for sharing

Vishal Ganore, ansys.com/student

FernandoTorres posted this 2 weeks ago

Hy Sir peter ! Great explanation.

But instead of 3d modelling , if we are dealing with 2d i.e. want to import a 2d sketch to mechanical from another software , do we have to use "CONCEPT , SURFACES FROM SKETCHES" each time for large sketches ? For example if I am an AutoCAD fan of 2d modelling , and import a complex 2d sketch into DM , do I have to make surfaces by CONCEPT"SURFACES FROM SKETCHES" every time?

peteroznewman posted this 2 weeks ago

Can AutoCAD create a bounded surface in the 2D drawing environment, or only lines and curves?  If it can create surfaces, then you may be able to import and mesh directly on them. If you can't create surfaces, then you have to make surfaces in DM (or SC).

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