The Moist Porous Media Version of the Heat and Moisture Transport Multiphysics Interface
When the Moist Porous Media version of the predefined Heat and Moisture Transport interface () is added (found under the Heat Transfer branch () of the Model Wizard or Add Physics window), it combines the Heat Transfer in Moist Porous Media and the Moisture Transport in Porous Media interfaces to model coupled heat and moisture transport in porous media filled with moist air and liquid water, by taking into account heat and moisture storage, latent heat effects, and liquid and gas transport of moisture.
Stationary, time-domain, and frequency-domain modeling are supported in all space dimensions.
On the Constituent Physics Interfaces
As a predefined multiphysics coupling, the Heat Transfer in Moist Porous Media and Moisture Transport in Porous Media interfaces are added to the Model Builder. In addition, a Multiphysics node is added, which automatically includes the Heat and Moisture multiphysics coupling feature.
The Heat Transfer in Moist Porous Media interface provides features for modeling heat transfer by conduction, convection, and radiation. The Moist Porous Medium model, active by default in all domains, provides in addition the functionality for moisture content dependency of thermodynamics properties and latent heat effects.
The Moisture Transport in Porous Media interface provides features for modeling moisture transfer by liquid transport (capillary and convective flow), and vapor convection and diffusion. An Hygroscopic Porous Medium model is active by default on all domains.
As an add-on Multiphysics Coupling
The Heat and Moisture multiphysics coupling is also available when there is at least one of each of the following interfaces with the specified model activated:
•
Any version of the Heat Transfer interface, with Moist Porous Medium model
•
Any version of the Moisture Transport interface, with Hygroscopic Porous Medium model
Settings for the Physics Interfaces and Coupling Features
When physics interfaces are added using the predefined couplings, specific settings are included with the physics interfaces and the coupling feature.
Table 8-9: Modified Settings for the Moist Porous Media Version of the Heat and Moisture Transport interface.
Physics or Coupling Interface
Modified Settings (if Any)
Heat Transfer in Moist Porous Media
In the Thermodynamics, Moist Air section of the Moist Air default subfeature of Moist Porous Medium, the Input quantity is set to Relative humidity, and the Relative humidity, ϕw, the Relative humidity, temperature condition, , and the Relative humidity, absolute pressure condition, , are automatically set to the variables from the Heat and Moisture multiphysics coupling feature.
In the Liquid Water Properties section of the Liquid Water default subfeature of Moist Porous Medium, the Liquid water saturation, sl, and the Velocity field, liquid water, ul, are automatically set to the variables from the Heat and Moisture multiphysics coupling feature.
Moisture Transport in Porous Media
In the Model Input section of the Hygroscopic Porous Medium default feature, the Temperature, T, is automatically set to the variable from the Heat and Moisture multiphysics coupling feature.
Heat and Moisture
The Heat Transfer and Moisture Transport interfaces are preselected
Note that these settings may be overridden if another predefined coupling is added.