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Poroelasticity - stress conflict

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Dear all,

I simulated a geothermal reservoir (cubic) which is stimulated by a "massflux" through a sphere. I think my model runs and works as it should.

I calculated the pressure and get results as expected. In comparison I calculated the maximum principal stress and get irrational results. Instead of positive principal stresses I get negative stresses with a strong decay. I expect positive stress changes (lower than pressure) due to injection of fluid and pressure increase around the sphere.

Has someone an idea what could be the problem? Is this a problem of notation or mesh?
Has someone modeled a same scenario and could give me an advice about the boundary conditions espacially for solic mechanics?

Greetings and thank you!

Nastasja K.



0 Replies Last Post Oct 21, 2015, 5:34 a.m. EDT
COMSOL Moderator

Hello Nastasja Kilicer

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