GitLab now enforces expiry dates on tokens that originally had no set expiration date. Those tokens were given an expiration date of one year later. Please review your personal access tokens, project access tokens, and group access tokens to ensure you are aware of upcoming expirations. Administrators of GitLab can find more information on how to identify and mitigate interruption in our documentation.
ENH: New suite for electrostatic deposition applications
New suite for electrostatic deposition applications
Solver function object: electricPotential: Computes the steady-state equation of charge conservation to obtain the electric potential by strictly assuming a quasi-static electrostatic field for single-phase and multiphase applications.
Finite-volume boundary condition: electrostaticDeposition: A boundary condition to calculate electric potential (V) on a given boundary based on film thickness (h) and film resistance (R) fields which are updated based on a given patch-normal current density field (jn), Coulombic efficiency and film resistivity.
Allowing to set:
Minimum current density for deposition onset
Minimum accumulative specific charge for deposition onset
Resistance due to main body and/or pretreatment layers
Initial electric potential
Resolved bugs
N/A
Details of new models (If applicable)
A showcase illustrating the verification of the electricPotential function object. Right: dielectric-dielectric water-air; left: conductive-dielectric water-air mixture (López-Herrera et al., 2011).
A showcase illustrating the electrostaticDeposition BC: pending
Risks
No changes in existing output.
Constraints
Depletion or abrasion of material due to negative current is not allowed.
Boundary-condition updates are not allowed during outer corrections to prevent spurious accumulation of film thickness.
resistivity, jMin, qMin and Rbody are always non-negative.
Quasi steady
No electrolyte/ionic transport
Quiescent
Sufficiently mixed
No magnetic field
No electrolyte and electric field interaction
Isotropic material and electrolyte
No film-flow interactions
No finite-area numerics
Remaining issues
Micro/nano current densities/potential differences cause numerical instabilities.
Small diffs in patch-normal current-density values of cathode faces can lead to small diffs in incremental film thickness (Delta_h) on those faces. With the very high value of 'resistivity', the small diffs in 'Delta_h' can then lead to comparable diffs in incremental electric potential differences across patch faces.
These differences can then be accumulated throughout a simulation, causing non-zero potential difference gradients across faces of the cathode.
Our workaround was to round the floating-point numbers of operand variables to a given number of decimal points (default: 8 decimals) - disallow micro/nano volts, so that such accumulation could be avoided.
However, this issue may cause numerical instabilities in more complex cases.
Therefore, the original expressions of the formulation may need to be revisited.
Advanced electrodeposition applications using OpenFOAM can be visited as well:
