ENH: outletMappedUniformInlet: add multiple fraction, offset and time delays

Summary

Aim

To implement a recirculation boundary condition for an arbitrary operand scalar with:

• Multiple connected outlets and inlets
• Optional filtration fraction for each recirculation loop
• Optional time delay for each recirculation loop

Additionally, write-control of scalarTransport was transferred from controlDict to the function object, and enabled UList parameters in interpolateXY for wider applications.

Previous status

Existing boundary condition: outletMappedUniformInlet

• Connected between a single outlet and a single inlet
• Instantaneous recirculation: no outlet-to-inlet time delay
• Optional filtration fraction is available as a constant value
• Optional offset is available as a constant value

Improvements

• Arbitrary number of outlets can be connected to a single inlet
  • Each inlet can be connected to different and arbitrary combination of outlets
• Each outlet-inlet connection has:
  • Optional filtration fraction as a Function1 type
  • Optional offset as a Function1 type (i.e. adding/substracting a substance)
  • Optional time delay (from outlet to inlet) as a Function1 type
• Each inlet has an optional base inlet-field as a PatchFunction1 type

Theory

Usage

Resolved bugs

N/A

Methodology

Remarks

• Difficult to design a simple verification test case due to the amount of data
• Verifications were carried out heuristically and manually
• No validation/benchmark available

Tests

• Cases
  • Single-outlet single-inlet, pisoFoam-LES, constant time-step: 1-single-outlet-inlet.zip
  • Multiple-outlet multiple-inlet, pisoFoam-LES, constant time-step: 2-multiple-outlet-inlet.zip
  • Multiple-outlet multiple-inlet, reactingParcelFoam-RANS, adjustable time-step
• Scenarios
  • Single/multiple-processor run
  • Single/multiple-processor run with restart
    • decomposePar
    • reconstructPar
    • redistributePar –decompose -redistributePar -reconstruct
  • No collated-format tests
  • Only scalar fields

Discussion

• No inlet-inlet connection
  • Could not infer any necessity for an inlet-inlet connection. Happy to be proven incorrect, however.
• No constraints were put onto the input entries; therefore, users need to use their attention and engineering judgements to avoid potential unphysical results
  • Except negative input of time delays are suppresed to be zero without emitting any warning messages.
  • For example, filtration fraction can be set to any number (e.g. more than 100%)
• Needs extensive tests to assume the functionalities safe for any single-phase, multiphase and overset finite-volume applications.

Meta-data

EP#1730

• Clean compilation (incl. submodules):
  • linux64ClangDPInt32Opt (clang11)
  • linux64GccDPInt32Opt
  • linux64GccSPDPInt64Debug
• Alltest: No new error