NairnFEAMPM Icon

Poroelasticity Command

The Poroelasticity command activates Poroelasticity calculations.

Poroelasticity (YesOrNo),<(refPP)>,<(visc)>

where

When poroelasticity calculations are activated, you must define poroelastic properties of the materials used in the analysis (e.g., undrained bulk modulus, Biot coefficient, and Darcy's law permittivity

Notes

  1. Both Diffusion calculations and poroelasticity calculation model fluid transport between particles and in fact use much of the same code. As result, they cannot be used simulataneously. An MPM simulation can only use one of them.
  2. Poroelasticity calculations often benefit by periodic FMPM. In fact, the "stiffness" of poroelasticity properties can mean simulations will be unstable unless you activate periodic FMPM.
  3. Poroelasticity is only activated for some materials.
  4. Because particles starting at pore pressure different than the reference pore pressure may cause dynamic artifacts, it is usually better to ramp pore pressure from reference conditions to desired initial conditions.
  5. The Poroelasticity command is only allowed for MPM analyses.