分析过coalChemistryFoam主函数和单颗粒的子模型 coalParcel之后，下面看颗粒了群子模型
coalCloud.H是描述碳颗粒的coalCloud类，是由以下6个类派生出来

coalCloud.H

 namespace Foam
 {
     typedef ReactingMultiphaseCloud
     <
         ReactingCloud
         <
             ThermoCloud
             <
                 KinematicCloud
                 <
                     Cloud
                     <
                         coalParcel
                     >
                 >
             >
         >
     > coalCloud;
 }

Cloud

template<class ParticleType>
class Foam::Cloud< ParticleType >

Base cloud calls templated on particle type.

其中包括获得Cloud中颗粒数量、增加/删除Cloud中的粒子等成员函数

KinematicCloud

template<class CloudType>
class Foam::KinematicCloud< CloudType >

Templated base class for kinematic cloud.

• cloud function objects

• particle forces, e.g.
  • buoyancy
  • drag
  • pressure gradient
  • ...
• sub-models:
  • dispersion model
  • injection model
  • patch interaction model
  • stochastic collision model
  • surface film model

ThermoCloud

template<class CloudType>
class Foam::ThermoCloud< CloudType >

Templated base class for thermodynamic cloud.

• Adds to kinematic cloud
  • Heat transfer
    在KinematicCloud基础上增加了颗粒群换热模型

ReactingCloud

template<class CloudType>
class Foam::ReactingCloud< CloudType >
Templated base class for reacting cloud.

• Adds to thermodynamic cloud
  • Variable composition (single phase)
  • Phase change

ReactingMultiphaseCloud

template<class CloudType>
class Foam::ReactingMultiphaseCloud< CloudType >

Templated base class for multiphase reacting cloud.

• Adds to reacting cloud
  • multiphase composition
  • devolatilisatsion
  • surface reactions