[CIG-SHORT] Smoothing Issues

[Charles Williams]

Hi Nick,

I know that there are ways to locally refine a mesh using LaGriT, but I’m not sure how to do it.  As Brad mentions, it might be worthwhile seeing how much an academic license for Trelis would be.  You could probably get a single node-locked license for not very much.  It’s worth looking on the csimsoft website to see.

Cheers,
Charles

p.s.  If you happen to find another cheap or free mesher that can produce output in Exodus II format, that would also work.


> On 3/11/2016, at 5:31 AM, Brad Aagaard <baagaard at usgs.gov> wrote:
> 
> Nick,
> 
> Neither CUBIT nor Trelis are free. Sandia provides CUBIT to US government agencies, while CSimSoft distributes Trelis (CUBIT variant) to the rest of the community.
> 
> In deciding which mesher to use I would consider the cost relative to how long it takes to generate the mesh you want.
> 
> Regards,
> Brad
> 
> 
> On 11/1/16 1:54 PM, Nick Wogan wrote:
>> Hi Charles,
>> 
>> I really am appreciating your feedback. For the past few days I have
>> been trying very hard to make an 'irregular' mesh with LaGriT, where
>> there are much finer elements where the density anomaly is. LaGriT is
>> proving to be somewhat difficult to use. I do not have access to Cubit
>> or Trelis, because (as far as i know) those programs are only freely
>> distributed to government organizations such as USGS, and I work for the
>> University of Oregon.
>> 
>> I just wanted to say I really appreciate your help! I will report back
>> once I have managed to make a mesh using LaGriT.
>> 
>> Cheers,
>> Nick
>> 
>> On Tue, Oct 25, 2016 at 2:10 PM, Nick Wogan <nicholaswogan at gmail.com
>> <mailto:nicholaswogan at gmail.com>> wrote:
>> 
>>    Thank you very much for the feedback,
>> 
>>    Attached is config/mesh/spacialdb file, and an image that provides a
>>    cross-section of the model giving material properties. I am using
>>    unusual material properties. Large parts of the model are youngs mod
>>    = 0.1 and Poisson's Ratio = 0.49
>> 
>>    The problem is as follows. There is an upper crust that has typical
>>    elastic material properties, and a lower crust that has young's mod
>>    = 0.1 and Poisson's Ratio = 0.49. In the center top of the upper
>>    crust there is a small chunk of low density. The displacement output
>>    looks great, only the stress output looks checkered in certain areas.
>> 
>>    I checked the quality of the mesh. Here is the Lagrit output:
>> 
>>    epsilon1, epsilonaspect: 4.6113656E-11  9.8059273E-32
>>    elements with aspect ratio < .01:                      0
>>    elements with aspect ratio b/w .01 and .02:      0
>>    ...
>>    elements with aspect ration b/w .2 and .5 :       0
>>    elements with aspect ratio b/w .5 and 1. :         314844
>>    min aspect ratio = 0.3795E+00     max aspect ratio = 0.7107E+00
>> 
>>    Thanks you again,
>>    Nick
>> 
>> 
>>    ​
>>     Checkered.zip
>>    <https://drive.google.com/file/d/0BxnRdwFIDyn5U01aZEYzUURrSzg/view?usp=drive_web>
>>    ​
>> 
>>    On Wed, Oct 19, 2016 at 4:40 PM, Nick Wogan <nicholaswogan at gmail.com
>>    <mailto:nicholaswogan at gmail.com>> wrote:
>> 
>>        Hi Pylith,
>> 
>>        I am having issues with the Pylith output lacking smoothness. It
>>        is very clear in the attached photo plotting stress_zz that
>>        there are large jumps in stress that are unexpected. Is this
>>        "checker-boarding" something that can be fixed?
>> 
>>        Let me know if I should send the mesh, cfg, spacialdb files.
>> 
>>        Thanks!
>> 
>>        Nick Wogan
>>        Research Assistant
>>        University of Oregon
>> 
>> 
>> 
>> 
>> 
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> 
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Charles A. Williams
Scientist
GNS Science
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C.Williams at gns.cri.nz <mailto:C.Williams at gns.cri.nz>
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