Incorrect nodal stress/strain in partitioned coupling with flow

[norihiro-w]

Nodal stress and strain values (usually used only for output) can be wrong if mechanics and flow are coupled in a partitioned way. This is because nodal strain values are always summed up for each solving DEFORMATION process. However, in each coupling iteration, the values should be reset to previous time step values. Nodal displacement and gauss point stress/strain values are still correct.

UPDATE: it seems nodal stresses are correct.

[ddettrick]

Hi Norihiro,

What is an example of mechanics and flow being coupled in a partitioned way?

Thanks for your help,

Cheers David

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David Dettrick
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On 30 August 2016 at 00:43, Norihiro Watanabe [email protected]
wrote:

Nodal stress and strain values (usually used only for output) can be wrong
if mechanics and flow are coupled in a partitioned way. This is because
nodal strain values are always summed up for each solving DEFORMATION
process. However, in each coupling iteration, the values should be reset to
previous time step values. Nodal displacement and gauss point stress/strain
values are still correct.

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[norihiro-w]

@ddettrick you can get an example from rect.zip. Change $OVERALL_COUPLING from 1 1 to 2 2 and you will see a difference in nodal strain.

I've just noticed that nodal stress is still correct. The description has been updated.

[ddettrick]

Thanks very much Norihiro.

Cheers David

Please visit our new AMD website: www.acidmetalliferousdrainage.com

David Dettrick
Earth Systems | Principal Environmental Engineer/Surface and Groundwater
Hydrologist

14 Church Street, Hawthorn, Victoria, 3122, Australia

T +61 (0)3 9810 7500 | T +61 (0)3 9810 7505 (Direct) | M +61 (0)4
1756 1074

E [email protected] | F +61 (0)3 9853 5030 |
www.earthsystems.com.au
http://www.earthsystems.com.au/

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On 30 August 2016 at 14:29, Norihiro Watanabe [email protected]
wrote:

@ddettrick https://github.com/ddettrick you can get an example from
rect.zip https://github.com/ufz/ogs5/files/444008/rect.zip. Change
$OVERALL_COUPLING from 1 1 to 2 2 and you will see a difference in nodal
strain.

I've just noticed that nodal stress is still correct. The description has
been updated.

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