Allen George authored Apr 05, 2025 and Stephan Kelm committed Apr 25, 2025

Introduction of scalarTransport models as a unified framework to handle fog/aerosol/noble gas transport. 
Major refactoring of the condensationModels library.

# condensation library
* Condensation library (`condensationModels`) completely refactored to provide a general and logical framework for condensation handling.
  - Fields like `massTransferRate` and `qcond` are shared between both wall and bulk condensation models, where internal field values represent bulk condensation values and boundary values represent wall condenation values.
    - The fields are only created if wall or bulk condensation is ON.
    - The fields like `condSucVelocity` are defined as boundary fields to save memory
  - The DtKader and DtJayatilleke wall condensation models are replaced with a generic wall condensation model named `diffusionLayer` which is selected by default.
    - The Dt calculation are moved to boundaryConditions named `compressible::DtKaderWallFunction` and `compressible::DtJayatillekeWallFunction` which are dynamically created based on the entries in the `condensationProperties`.
     - The Dt wall functions gets corrected by the multiSpeciesDiffusivity class
  - BCs: `condensingWallVelcoity` and `nonCondensableMassFraction` modified to work well with new condensationModel library.
  - Bulk condensation model for H2O is renamed to `saturationEquilibrium` model
    - This model now calculates only source terms due to bulk condensation and does not perform fog transport
  - The fog transport is now taken care by the `scalarTransportModel` in which the fog is one of the scalars which will have source terms coming from the bulk condensation model
    - The name of the scalar to be transported as fog is defined as dictionary entry in the `condensationProperties` as `scalarName`.
  - The `containmentFluid` module is now has a simplified way of adding condensation source terms, in which all the conditions for adding source terms are now handled by the condensationModel class
* `fvModels` named `tubrulenceSourceSink` added include the bulk condensation source terms in the k and omega fields.
* All the condensation [testCases](testCases/bulkCondensation) updated to fit with the new library sturcture.

# scalar transport library
* New library named `scalarTransportModels` added for handling different kinds of scalars.
  - It provides a general framework for handling different types and arbitary number of scalars like aerosols, fog and noble (tracer) gases.
  - The aerosol and fog scalars can be mono or poly dispersed.
  - The noble gases are not dispersed and hence does not contain terms related to diameter, but has additional molecular diffusivty term.
  - The framework also allows the scalars interaction to be segregated or aggregated.
    - The `segregated` interaction approach considers each scalar (aerosol or fog) as a distinct entity, each with its own drift velocity and Brownian diffusion coefficient, allowing them to be transported independently.
    - In contrast, the `mixture` interaction approach treats all scalars (aerosols and fog) as a single entity, sharing a common drift velocity and Browninan diffusion coeffient.
    - The noble gas scalars are always segregated.
  - The `multiScalarTransportModel` class combines all scalarTransports to a unified framework.
  - The `aerosol` scalars have to option to add `decay heat` to the gas mixture.
  - The properties and model selection for scalars are specified in the `scalarProperties` [dictionary](doc/files/scalarTransport.md).
  - Added scalarTransportSizeDistribution and depositionEfficiency function objects for scalar fields post processing.
  - Added `testCases/scalarTransport` to demonstrate and test the scalarTransport model library.
* `fvModels` named `fieldEqnStabilisation` added prevent failure of single cell simulation test cases.

# Generic models library
* New library named `genericModels` added for all common models which are shared by other libraries.
  - These include Brownian diffusion models, drift velocity models, population balance models and thermophysical models.
  - The drift velocity model has submodels for including drag, thermophoresis and diffusionphoresis models into the drift velocity formulation.
  - The population balance model comprises of submodels for nucleation, coalescence and growth or shrink.
  - The thermophysical model consists of latent heat and saturation condition calculation models which currently features formulations for steam.

# containmentFoam template executables
* Added executables for generated template files with containmentFOAM headers.
  - This is an alternative of openfoam template file generation executables.
  - containmentFOAM template generation executables - cfNewSource, cfNewApp, cfNewBC, cfNewFunctionObject, cfNewTemplate.
  - The `Allwmake.sh` will add these executables to the APPBIN for usage within containmentFOAM.