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Table of Contents
Thermal Load Elements (Metafor > v3593)
Since MR 167 (Metafor v3593), there are two kind of thermal load elements depending on whether the load is applied on the volume element (volumetric source) of on the boundary of the elements.
All of them are implemented on the same framework and have the same options.
Element
The first step consists in defining an ElementProperties, as
prp = ElementProperties(typeEl) prp.put(param, value)
where
typeEl | desired element (for example Pressure[2|3]DElement - see below) |
param | name of the property associated to the element (e.g. NIP) |
value | value of the corresponding property (e.g. the Number of Integration Points) |
mat = materset.define(no, PressureMaterial) mat.put(param, value) mat.depend(param, fct, lock)) # optional ...
where
param | name of the property associated to the material (e.g. PRESSURE) |
value | value of the corresponding property (e.g. value for the pressure) |
Interaction
The interaction used for thermal boundary/source elements is a LoadingInteraction. It 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 | meshed geometric entity where the boundary conditions are applied (one part of the boundary or on part of the mesh) |
prp | Properties of boundary condition elements to be generated |
The Source Elements are defined on Volumic mesh where Boundary Elements are defined on boundary of the mesh.
Element Types
TmBoundary2DElement - TmBoundary3DElement - TriangleTmBoundary3DElement
Boundary elements has to be defined in the LoadingInteraction on the boundary of the mesh.
- The TmBoundary2DElement are defined on lines (wires) of a 2D quadrangular mesh.
- The TmBoundary3DElement are defined on sides (skins) of a 3D hexahedral mesh.
- The TriangleTmBoundary3DElement are defined on sides (skins) of a 3D tetrahedral mesh.
Parameters
| Name | Description | Dependency |
|---|---|---|
STIFFMETHOD | Method used to compute the stiffness matrix\\= STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - |
MATERIAL | Number of the ThermalBoundaryMaterial to consider | |
NIP | Number of integration points by direction (default : 2) | - |
| for TriangleTmBoundary3DElement : Total Number of integration points (default : 1) | - |
Tm2Boundary2DElement - Tm2Boundary3DElement - TriangleTm2Boundary3DElement
Boundary elements has to be defined in the LoadingInteraction on the boundary of the mesh where the TM2 formalism is used (second order thermal field on a first order geometrical mesh)
- The Tm2Boundary2DElement are defined on lines (wires) of a 2D quadrangular mesh.
- The Tm2Boundary3DElement are defined on sides (skins) of a 3D hexahedral mesh.
- The TriangleTm2Boundary3DElement are defined on sides (skins) of a 3D tetrahedral mesh.
Parameters
| Name | Description | Dependency |
|---|---|---|
STIFFMETHOD | Method used to compute the stiffness matrix\\= STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - |
MATERIAL | Number of the ThermalBoundaryMaterial to consider | |
NIP | Number of integration points by direction (default : 3) | - |
| for TriangleTm2Boundary3DElement : Total Number of integration points (default : 3) | - |
TmSource2DElement - TmSource3DElement - TriangleTmSource2DElement (missing TetraTmSource3DElement)
Source elements has to be defined in the LoadingInteraction on a volumetric mesh.
Be careful that they can be associated to any ThermalBoundaryMaterial that can have no physical meaning (ex : defining a ConvectionMaterial in a mesh not on its surface), but could be a work around to apply heat to a model… Up to now, there a no physical consistency test…
- The TmSource2DElement are defined on sides (skins) of a 2D quadrangular mesh.
- The TmSource3DElement are defined on volumes of a 3D hexahedral mesh.
- The TriangleTmSource3DElement are defined on volumes of a 3D tetrahedral mesh.
Parameters
| Name | Description | Dependency |
|---|---|---|
STIFFMETHOD | Method used to compute the stiffness matrix\\= STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - |
MATERIAL | Number of the ThermalBoundaryMaterial to consider | |
NIP | Number of integration points by direction (default : 2) | - |
| for TriangleTmSource3DElement : Total Number of integration points (default : 1) | - |
Tm2Source2DElement - Tm2Source3DElement - TriangleTm2Source2DElement (missing TetraTmSource3DElement)
Source elements has to be defined in the LoadingInteraction on a volumetric mesh where the TM2 formalism is used (second order thermal field on a first order geometrical mesh)
Be careful that they can be associated to any ThermalBoundaryMaterial that can have no physical meaning (ex : defining a ConvectionMaterial in a mesh not on its surface), but could be a work around to apply heat to a model… Up to now, there a no physical consistency test…
- The Tm2Source2DElement are defined on sides (skins) of a 2D quadrangular mesh.
- The Tm2Source3DElement are defined on volumes of a 3D hexahedral mesh.
- The TriangleTm2Source3DElement are defined on volumes of a 3D tetrahedral mesh.
Parameters
| Name | Description | Dependency |
|---|---|---|
STIFFMETHOD | Method used to compute the stiffness matrix\\= STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - |
MATERIAL | Number of the ThermalBoundaryMaterial to consider | |
NIP | Number of integration points by direction (default : 3) | - |
| for TriangleTm2Boundary3DElement : Total Number of integration points (default : 3) | - |