Hi Ranjeet,
In contrast to Dumux 2.12, we currently do not use an incremental
formulation in Dumux 3. That is, in your question effSigma is the total
effective stress, NOT the change in effective stress with respect to the
initial conditions.
Regarding your question on the sign convention. As far as I know, the
soil mechanics sign convention is to denote compressive stresses as
POSITIVE. In any case, we are using the notation of structural
mechanics, which means that compressive stresses are negative.
Unfortunately, there is still an issue in the code in case you want to
use deformation-dependent porosities. This will lead to very bad
nonlinear solver convergence. We have not yet found an easy fix for
this, but we are working on it!
Best wishes,
Dennis
On 29.03.20 15:01, Ranjeet kumar wrote:
Hi All,
I want to develop a poroelastic model using el2p module in Dumux 3.1.
As per Dumux2.12 class documentation, soil mechanics sign convention
(i.e. compressive stresses are negative) has been used in el2p module.
However, papers & thesis based on Dumux2 has used opposite sign
convention. Can you clarify which sign convention is being used in
Dumux3.1?
Q2. As a linearised form of momentum balance equation is being solved
in el2p model, the solution effective stress obtained from:
const auto effSigma = StressType::effectiveStressTensor(*this,
element, fvGeometry, elemVolVars, fluxVarsCache);
is the total effective stress or change in effective stress with
respect to initial effective stress?
References:
1. p-3, Volume-Based Modelling of Fault Reactivation in Porous Media
Using a Visco-Elastic Proxy Model. Martin Beck1 · Gabriele Seitz1 ·
Holger Class1
2. p-3, Modelling fault reactivation with characteristic stress-drop
terms. Martin Beck and Holger Class
3. p68-69, Coupling Models of Different Complexity for the Simulation
of CO2 Storage in Deep Saline Aquifers
Thank you,
Regards,
Ranjeet
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