- The arc will frequently enclose an angle less than 180 degrees.
  For the case, it is possible to define the arc by its endpoints
  and its centre (origin) point. For example,

      arc 0 1 origin (0 0 0);

  When defined in the way, any discrepancy in the arc radius for the
  endpoints is resolved by adjusting the origin to ensure that the
  average radius is satisfied.

  It is also possible to specify a \em flatness factor as a multiplier
  of the radius. For example,

      arc 0 1 origin 1.1 (0 0 0);

ENH: minor code cleanup for block edges

ENH: expose point appending as polyList::concat

STYLE: adjust blockMesh advanced/non-advanced options

- make -merge-points "non-advanced" (for better exposure)
- make -write-obj "advanced" (-write-vtk is preferred)

- contents to be filled with a later assignment.

  This can help avoid deduction issues when populating from a list of
  tokens, and the templated version is selected:

  ```
  template<class T>
  primitiveEntry(const keyType&, const T&);
  ```

ENH: support construct empty ITstream with given name

- populate contents later by assigment

- Eg, cannot compare addresses of DynamicList<T,16> and DynamicList<T,8>
  [clang], so compare their cdata pointers instead.

- use clear/swap paradigm for more code reuse

Note: fixed similar issue with copy/reuse constructor

- provides consistency with identity(label, label) and looks more
  familiar than using labelRange::labels()

- relocates labelRange IO operators to IntRange

ENH: make sliceRange interators random access

STYLE: scalarRanges::match() instead of predicate operator

Pstream ranges

See merge request !382

- returns a range of `int` values that can be iterated across.
  For example,

      for (const int proci : Pstream::subProcs()) { ... }

  instead of

      for
      (
          int proci = Pstream::firstSlave();
          proci <= Pstream::lastSlave();
          ++proci
      )
      {
          ...
      }

- returns a range of `int` values that can be iterated across.
  For example,

      for (const int proci : Pstream::allProcs()) { ... }

  instead of

      for (label proci = 0; proci < Pstream::nProcs(); ++proci) { ... }

- wedge geometry, so topology merge results in zero-sized faces.

- only use implicit legacy handling if the "fanCurve" entry is missing
  and the "file" entry is present.

- timeVaryingUniformFixedValue -> uniformFixedValue

- allows a variety of functions (eg, coded, expressions, tables, ...)

- more similarity to finiteVolume patch type

STYLE: remove unused timeVarying... from etc/controlDict

- adds "future-proofing" for derived expression boundary conditions
  by moving potential failure modes into the base class.

- failed to properly use the inherited constructors

STYLE: adjust documentation comments

- specifying gradientExpr without a valueExpr, a missing fractionExpr
  should be treated as 0 (gradient only), not as 1 (value only)

ENH: improve sanity checks + evaluation short-cuts in exprMixedFvPatchField

- incorrect branching logic caused the "0" case to be ignored

- add reverse iterators and replace std::iterator
  (deprecated in C++17) with full definitions

- simplify construction of iterators

- construct labelRange from a single single parameter.
  This creates a (0,len) range.

- make basic constructors forms constexpr.
  Remove unused size checks.

- Derive labelRange from new IntRange template class.
  Allows reuse of base functionality with different integral sizes.

Deprecations:

  - deprecate labelRange::valid() in favour of using
    labelRange::empty() or the bool operator.
    For example,

        if (range) ...  vs older  if (range.valid()) ...

DEFEATURE: drop labelRange::null, scalarRange::null static variables

- turned out to be not particularly useful.
  Can simply use constexpr contructor forms

DEFEATURE: drop labelRange::identity static method

- simply use the single-parameter constructor

- aids when locating truncated files

New Evap-Cond Lagrangian model  (FuchsKnudsen)  for solution (liquid + solid) droplets

See merge request !377

sergio authored 5 years ago and Andrew Heather committed 4 years ago

1) Adding LiquidEvapFuchsKnudsen model for lagrangian evaporation.
   This models is based on a diffusion type of evaporation/
   condensation on particles composed of solution (liquid + solid).

2) Adding modes of calculating the particle rho and volume change.
   The new keyword in constantProperties is 'volumeUpdateMethod'
   which three options:
        a) constantRho
        b) constantVolume
        c) updateRhoAndVol

   The old keyword 'constantVolume' true/face is still valid

3) The entry rho0 is now optional for multicomponent parcels.
   If defined , it is used, but if it is not the actual mixture
   provided is used to calculate rho0 of the particle.
   T0 is still used as initial T and Cp0 is over-written in the
   multicomponent cloud but still required.

4) Adding tutorial for evaporation/condensation model

BUG: faMatrix::residual changes source vector (fixes #1835)

ENH: improve code alignment between faMatrix and fvMatrix

- support setValues() with a single value

- refactor UniformField accordingly

- can use ListOps::appendEqOp as the more general form.
  Note that this uses a different template parameter.
  Eg,
      `globalMeshData::ListPlusEqOp<labelList>()`
  vs. `ListOps::appendEqOp<label>()`

- select default nastran PLOAD2 or PLOAD4 based on field type.
  Default to PLOAD2 for scalar types and PLOAD4 for vectors etc.

- relocate nastran SHELL/MAT cards.
  Previously wrote at the end of the file, now emit when writing the
  geometry itself. This improves modularity (of code and files)

- initial support for common geometry file for nastran

- abstracted out from ensight surface writer for potential reuse by
  other surface writers.

- for CAE formats such as abaqus, nastran, starcd, etc, the element id
  is already part of the output format itself. For these cases, there
  is no use in generating an additional "Ids" field.

ENH: add code to ignore negative face ids

- these will arise from very special cases, such as when a
  solid element and side are encoded into a single integer.

BUG: starcd surface values output did not use original face ids