Defining Solar Radiation Behavior at a Wall

You can define the solar radiation behavior for any type of wall boundary condition.

Before you begin: In the fluid physics, the following two settings must be specified:
  • The Radiation model must be set to None.
  • Enable solar radiation must be selected.
For more information, see Defining the Fluid Physics of a Flow Simulation.
See Also
Defining a Wall
  1. From the Wall dialog box, expand the Solar wall conditions.
  2. From the Solar radiation options, select Solar wall.
    Several solar parameters appear in the Solar wall conditions section. You can define any of the solar options specified below using a uniform value, spatially-varying mapped data, or a JavaScript user subroutine. You can also apply scaling or specify the value using a predefined amplitude.
  3. Specify Visible band transmissivity, which defines the fraction of direct solar energy that passes through the surface in the visible band; that is, energy that is neither absorbed nor reflected.
  4. Specify Visible band absorptivity, which defines the fraction of direct solar energy that is absorbed by the surface in the visible band.
  5. Specify IR band transmissivity, which defines the fraction of direct solar energy that is absorbed by the surface in the IR band.
  6. Specify IR band absorptivity, which defines the fraction of direct solar energy that is absorbed by the surface in the IR band.
  7. Specify Indirect band transmissivity, which defines the fraction of indirect solar energy that passes through the surface; that is, energy that is neither absorbed nor reflected.
  8. Specify Indirect band absorptivity, which defines the fraction of indirect solar energy that is absorbed by the surface.
  9. Specify Diffuse fraction, which defines the fraction of reflected solar energy that is reflected diffusely (equally scattered in all directions) as opposed to specularly (mirror-like reflection).