Radiation

Materials

Since radiation interactions are boundary conditions interactions (LoadingInteraction), no materials must be associated to the element.

Therefore, the first step consist in defining an ElementProperties, as

prp = ElementProperties(typeEl)
prp.put(param1, value1)
prp.depend(param1, fct1, Lock1)) #optional
...

where

`typeEl`	desired element (for example `Tm[2]Rayonnement[2\|3]DElement`)
`param1`	name of the property associated to the element (for example `RAY_EMISSIVITY`
`value1`	value of the corresponding property
`fct1`	function which characterizes the dependency of the property (optional: no fct if no dependency)
`Lock1`	Lock which defines the dependency variable of the property (compulsory if there is a dependency)

Using radiation elements requires the use of Kelvin in the entire model !!!

Thermal radiation element with given room temperature. First or second degree.

TODO : Ajouter équations de rayonnement

Name	Description	Dependency
`STIFFMETHOD`	Method used to compute the stiffness matrix\\= `STIFF_ANALYTIC` : analytic matrix (default) = `STIFF_NUMERIC` : numerical matrix	-
`BOLTZMANN_CST`	Boltzmann Constant (required to set units) = $ 5.67e^{-8} W/m^2K^4 $ = $ 5.67e^{-11} mW/mm^2K^4$	Set
`RAY_EMISSIVITY`	Relative emissivity between two gray bodies (solid / room) $\epsilon = \frac{\epsilon_1 * \epsilon_2}{\epsilon_1 + \epsilon_2 - \epsilon_1 * \epsilon_2}$	time
`RAY_TEMP_AMB`	Room temperature (K)	time
`NPG`	Number of integration points (default : tm : 2 / tm2 : 3)	-

The interaction is defined as:

load = LoadingInteraction(no)
load.push(gObject1)
load.push(gObject2)
...
load.addProperty(prp)
interactionset.add(load)

where

`no`	number of the `Interaction`
`gObject1`, `gObject2`	mesh geometric entity where the boundary conditions are applied
`prp`	Properties of boundary condition elements to generate