Initial Pressure in the Fracture

[yamid-tech]

This issue arises when we model Hydraulic Fracture, as in the basic example in the tutorials. When running the hydraulic fracture simulation with an initial pressure >0, the simulated pressure in the fracture always starts at zero or at much lower pressures than the assigned pi, even if the properties have been defined to model leak-off and poroelasticity. I have defined initial pore pressure in various ways, as shown below (for example). However, the fracture pressure always starts at much lower pressures (it seems that setting the initial pressure does not have an effect on the fracture pressure).

<FieldSpecification
  name="initialPressureFracture"
  initialCondition="1"
  setNames="{ all }"
  objectPath="ElementRegions/Fracture/FractureSubRegion"
  fieldName="pressure"
  scale="4.999e6"/>

It would be beneficial to illustrate a scenario where the initial pressure is not zero. For example, the basic HF example has a pore pressure CSV, but it is never used. There are numerous conflicts with solvers, etc., when this is activated, and when conflict is resolved, the pore pressure does not follow the set value(s). It is essential to observe how pressure increases during injection and how it changes during fall-off as a function of closure pressure.