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-   -   multiple regions for soild mechanics? (http://www.cfd-online.com/Forums/openfoam-solving/107675-multiple-regions-soild-mechanics.html)

chaz October 3, 2012 17:05

multiple regions for soild mechanics?
 
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.

Shriya April 22, 2013 09:37

Quote:

Originally Posted by chaz (Post 384780)
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

chaz April 22, 2013 10:33

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

Shriya April 22, 2013 10:41

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

ricardow May 2, 2013 12:29

Computational Mechanics
 
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.

Shriya May 3, 2013 07:00

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

ngj May 3, 2013 07:24

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

Shriya May 3, 2013 07:37

Quote:

Originally Posted by ngj (Post 424940)
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

ngj May 3, 2013 07:46

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

Shriya May 3, 2013 08:49

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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