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Minor clean-up

Hot fixes for v2106

See merge request !474

ENH: Adding subMesh option to momentumError and div FOs

See merge request !463

sergio authored Jun 22, 2021 and Mattijs Janssens committed Jun 23, 2021

1) Adding subMesh capabilities to momentumError and div FOs.
	- A subMesh is created from cellZones.
	- The operators (div, etc) are only calculated in the subMesh.

2) Optionally, halo cells can be added to the cellZones.

3) New helper class to handle the subMesh creation and field mapping.

TUT: multiphase: replace boatAndPropeller with rigidBodyHull

See merge request !473

ENH: less cryptic error message in surfaceWriters::vtkWriter

- fall back to nFields=1 and report the problem.

- add setter/getter methods for the zone selection

- construct for multiple zone selection

- support explicit zone ids instead of name matcher

- add setter/getter methods for number of grow/shrink steps,
  which allows reuse of the same object.

- remove the lower input hard-limit of 1 step, to allow definition of
  a no-op filter.

- drop early exit from grow/shrink cycle (potential parallel issues).

CONFIG: set API level to 2106 in ramp-up for release

- previously a function (unlike the csh version) but since bashrc and
  setup have been split -> replace with inline definition

STYLE: formatting/wording for openfoam starters

TUT: simplify controlDict modification, add default substitution

ENH: accept '/' for end-of-options terminator (etc/openfoam)

- makes the application or service more apparent.
  * eg.  /usr/bin/openfoam / blockMesh
  * vs.  /usr/bin/openfoam -- blockMesh

  Accept lone '-' as the end-of-options terminator, as per bash

- Adjust handling of openfoam '-c' option to flag that a command-string
  will appear, but continue with option parsing.
  Consistent with bash definition.

- in the 'auto' mode (now the default), it will use cleanCase and also
  remove the 0/ directory if a 0.orig/ directory also exists.

  This corresponds to a frequent idiom and can be used quite safely
  for most cases.

ENH: add -serial / -parallel preference for foamRunTutorials

- adjust commented-out evaluation to avoid warnings.

  With code like this
  ```
  #if 0
  nxin    #eval{ round($nxin / 5) };
  #endif
  ```

  The handling of the "#if 0 / #endif" clause uses the plain ISstream
  parser to tokenize. This means that the "round(" is parsed as a word
  with a mismatched closing ')', whereas the "#eval" parser will slurp
  everything in until the closing brace and send it off as a string
  to the expression parser.

STYLE: PDRFOAM End of Program was inconsistent with other applications

See merge request !447

AMI improvements

See merge request !468

Andrew Heather authored Feb 10, 2021 and Mattijs Janssens committed Jun 18, 2021

- Added new faceAreaWeightAMI2D AMIMethod:
  - performs intersection using a new 2D triangle class;
  - candidate face matches set using an AABBTree method (vs advancing front for
    faceAreaWeightAMI).

  - Use by setting the AMIMethod entry when specifying the AMI in the
    constant/polyMesh/boundary file, e.g.

        AMI
        {
            type            cyclicACMI;
            AMIMethod       faceAreaWeightAMI2D; // new method
            Cbb             0.1; // optional coefficient
            nFaces          1000;
            startFace       100000;
            matchTolerance  0.0001;
            transform       noOrdering;
            neighbourPatch  AMI1;
            nonOverlapPatch AMI1_non_overlap;
        }

  - The optional Cbb coeffcient controls the size of the bounding box used when
    looking for candidate pairs; the value of 0.1 is the default and worked well
    for a large range of test cases. For badly matched AMI patches this may need
    to be increased.

- Deprecated the partialFaceAreaWeightAMI class - primarily used by ACMI:
  - functionality now offered by the AMI variants.

ENH: Adding new permeable boundary conditions and a tutorial

See merge request !471

Sergio Ferraris authored Jun 15, 2021 and Kutalmis Bercin committed Jun 17, 2021

- prghPermeableAlphaTotalPressure for p_rgh
- pressurePermeableAlphaInletOutletVelocity for U
- new helper class for pressure-related BCs: updateableSnGrad