CAE Software【Femtet】Murata Software Co., Ltd.
General
Constant current flows through a conductive strip line. The current distribution is solved.
Then the eventual joule loss and temperature rise are solved.
“Input by current” is selected in the Analysis Condition Setting.
The current distribution and the temperature distribution can be viewed.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Select “Electric field-thermal coupled [Curie]” as solver.
This is a steady-state analysis.
Item |
Settings |
Solver |
Electric field – thermal coupled analysis [Curie} |
Analysis Type |
Steady-state analysis |
Enter 100[A] for current.
Tabs |
Setting Item |
Settings |
Electric Field-Thermal |
Input by current |
Select |
Current |
Constant Current |
100[A] |
The substrate is a solid body.
The strip line is a sheet body.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
Board |
001_Alumina * |
6/Sheet |
StripLine |
008_Cu * |
* Available from the Material DB
It is assumed that there is no current flow in the alumina substrate.
The conductive strip is a sheet body. The thickness must be defined in the body attribute, where the resistance can be entered too.
Body Attribute Name |
Thickness/Width |
Analysis Domain |
Board |
|
Usable Domains: Deselect “For use in electric field analysis” |
StripLine |
Thickness of Sheet Body : 0.1mm |
|
Resistivity needs to be set for Board for [Curie] even though it is not used.
The resistivity is blank for 001_Alumina by default.
Enter 1.0 there tentatively. (The value doesn’t affect the simulation)
Material Name |
Resistivity |
001_Alumina |
1.0[Ωm] |
The temperature of the bottom face of the substrate is set to 25[deg] by the boundary condition of T0.
The faces where the strip line ends are set with the “adiabatic” boundary condition, T_Wall.
That keeps the outer boundary condition from being applied on them.
Boundary conditions, V0 and V1, define the voltages at either end of the strip
As the current input is selected, the voltage information is irrelevant
but must be defined for I/O points for the current.
The heat transfer to the ambient is defined by the outer boundary condition.
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
T_Wall/Face |
Thermal |
Adiabatic |
|
T0/Face |
Thermal |
Temperature |
25[deg] |
V0/Edge |
Electric |
Electric wall |
Waveform: Constant, Voltage: 0.00[V] |
V1/Edge |
Electric |
Electric wall |
Waveform: Constant, Voltage: 0.01[V] |
Outer Boundary Condition * |
Heat |
Heat Transfer/Ambient Radiation |
Heat transfer coefficient: 10 [W/m2/deg] Ambient temperature: 25[deg] |
To set Outer Boundary Condition, go to the [Model] tab
and click [Outer Boundary Condition] .
The vectors of the current density are shown below.
The current density is not even at around the bending area of the strip.
The temperature contour is shown below.