Radiation output requests

This table list the available output result sets that you can request from the thermal solver in Thermal/Flow, Electronic Systems Cooling, Space Systems Thermal, or Multiphysics.

Output request type	Result set in Post Processing Navigator	Description
View Factor Sums	View Factors Sum — Elemental	Sum of the view factors for radiating elements.
Environmental View Factors	Environmental View Factors — Elemental****Environmental Gray View Factors — Elemental	Elemental view factors and gray body view factors for elements radiating to and from the radiative environment. In reports, the radiative environment is called SPACE.
Apparent Temperatures	Apparent Temperature — Elemental	The apparent radiative temperature of an element is:Tapparent = ε0.25 (Topp + Tabs) — Tabsε is the emissivity of the element, Topp is its Oppenheim element’s temperature, and Tabs is the absolute temperature constant.
Radiances	Radiance — Elemental	Total radiative flux leaving the surface, including emission and reflection. Radiative flux is calculated in power per unit area.The radiance of an element is:Radiance = σ x (Topp + Tabs)4 / πσ is the Stefan-Boltzmann constant, Topp is its Oppenheim element’s temperature, and Tabs is the absolute temperature constant.
Fluences	Fluence — Elemental	Total energy input into the element, which is accumulated over time:t is time, q is the power or heat load from both radiative and non-radiative sources, and A is the element area.
Net Radiative Fluxes	Net Radiative Flux — Elemental	Net radiative flux leaving the element from infrared exchange. The net flux is due to radiative exchange from gray or non-gray emission of elements in radiation view factor requests. A positive value means a net radiation out of the element.
Radiosity Fluxes	Radiosity Flux — Elemental	Sum of elements’s emitted and reflected infrared flux. The radiosity flux is the radiosity from radiative exchange in radiation view factor requests.
Irradiance Fluxes	Irradiance Flux — Elemental	Incident infrared radiation on an element. The irradiance flux is the incoming flux from radiative exchange between elements in radiation view factor requests.

Note:

• All result sets are elemental results computed at element’s center of gravity.

• The view factor result sets are displayed under the Time Invariant node in the Post Processing Navigator when these values are constant over the complete transient run.

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