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multiple regions for soild mechanics?

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Old   October 3, 2012, 17:05
Default multiple regions for soild mechanics?
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Chaz
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Hello,
I would like to solve solid mechanics problems such as shown in the plateHole example in solidDisplacementFoam. However, it is not clear if this solver or a similar solver is able to handle multple regions with different thermal and mechanical properties.

chtMultiRegionFoam handles this, but is there a similar way to solve solid mechanics problems with multiple regions? For example, a problem with two metals bonded that is subject to a temperature change will bend due to their different coefficients of thermal expansion. aka a classic bi-metal problem.

Thank you.
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Old   April 22, 2013, 09:37
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Quote:
Originally Posted by chaz View Post
Hello,
I would like to solve solid mechanics problems such as shown in the plateHole example in solidDisplacementFoam. However, it is not clear if this solver or a similar solver is able to handle multple regions with different thermal and mechanical properties.

chtMultiRegionFoam handles this, but is there a similar way to solve solid mechanics problems with multiple regions? For example, a problem with two metals bonded that is subject to a temperature change will bend due to their different coefficients of thermal expansion. aka a classic bi-metal problem.

Thank you.
Hi Chaz,

I'm currently having the same problem. I need to use the solid mechanics solvers for a multi-region case, and I'm not sure how it is done. I can't seem to find any others threads with relevant information. Did you manage to figure it out? If so, could you please get back to me?

Thanks,
Shriya
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Old   April 22, 2013, 10:33
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I have not found a solution, but have not dug into it deeply.

The people at UCD in Dublin look to have that capability, but I have not inquired of them yet. Not sure if their public solvers can handle this type of problem.

http://adhesion.ucd.ie/openfoam/UCD_...AM_-_Home.html
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Old   April 22, 2013, 10:41
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Dear Chaz,
Thanks a bunch for your response! I guess I'll have to find a way to combine ChtmultiregionFoam and the solver I need. But, I'll consider contacting them before that.

Shriya
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Old   May 2, 2013, 12:29
Default Computational Mechanics
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Hi All,

Did you get something about this topic?
Iím interested in use OpenFOAM to solve a solid mechanic problem as shown in plateHole but for a multi-region case.
I would like to know how is the behaving of a well casing when submitted to high temperature and pressure, also considering the in situ stresses.

Thks.
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Old   May 3, 2013, 07:00
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Hi Ricardow,

No, nothing yet. I'm trying to combine the solvers on my own, but it's much harder than I thought! :| I am yet to ask the people at UCD if their solvers have the capabilities for multi-regions.

Shriya
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Old   May 3, 2013, 07:24
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Niels Gjoel Jacobsen
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Hi Shriya,

Merely curious if what you are trying to accomplish really needs multiple regions. Would it not be sufficient with a spatial varying material property?

Any way, in the following thread the solid mechanics library of UCD is discussed:

Code:
http://www.cfd-online.com/Forums/openfoam-news-announcements-other/106881-solid-mechanics-solvers-added-openfoam-extend.html
Good luck,

Niels
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Old   May 3, 2013, 07:37
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Quote:
Originally Posted by ngj View Post
Hi Shriya,

Merely curious if what you are trying to accomplish really needs multiple regions. Would it not be sufficient with a spatial varying material property?

Any way, in the following thread the solid mechanics library of UCD is discussed:

Code:
http://www.cfd-online.com/Forums/openfoam-news-announcements-other/106881-solid-mechanics-solvers-added-openfoam-extend.html
Good luck,

Niels
Hi Niels,

I need to be able to predict the heat transfer between two solids with different material properties. And then I need to be able to calculate the residual stresses that are generated in the process.

Could you please explain 'spatial varying material property'? Do you mean being able to use setFields for a certain portion of the geometry?

Thank you for the link. I'm yet to come across an example where more than a single region is being used though.

Shriya
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Old   May 3, 2013, 07:46
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Hi,

Yes, as a starting point, you could maybe use e.g. setFields to specify varying thermal and other material properties in one single domain. This is an easy way for you to see, if you obtain reasonable results with such a less sophisticated solver.

However, since I have never looked at solids in OF, I do not know, if you can do it right away, or whether you need to slightly modify the solvers to include spatial variations in these fields.

Kind regards

Niels
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Old   May 3, 2013, 08:49
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Hi Niels,

I did attempt that once, but didn't spend too much time on it, because I need to provide boundary conditions at the interface between the two solids, and I reckon that's not possible if I'm dealing with a single domain.
So far I haven't come up with a simpler solution than having to combine the two solvers!

Much thanks for your suggestions.
Shriya
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