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--- doc:user:elements:boundaries:radiation [2013/07/10 11:13] – joris
+++ doc:user:elements:boundaries:radiation [2016/03/30 15:23] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Radiation ======
+===== Materials=====
+Since radiation interactions are boundary conditions interactions (''LoadingInteraction''), no materials must be associated to the element.
+===== Element =====
+Therefore, the first step consist in defining an ''[[doc:user:elements:general:def_element_properties|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''| [[doc:user:general:locks|Lock]] which defines the dependency variable of the property (compulsory if there is a dependency) |
+==== Tm[2]Rayonnement[2|3]DElement ====
+:!: Using radiation elements requires the use of Kelvin in the entire model !!!
+Thermal radiation element with given room temperature. First or second degree.
+<note>TODO : Ajouter équations de rayonnement </note>
+=== Parameters ===
+^   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)    |  -  |
+===== Interaction =====
+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''      | [[doc:user:elements:general:def_element_properties|Properties]] of [[#Element|boundary condition elements]] to generate |