CAE Software【Femtet】Murata Software Co., Ltd.
Voltage is applied across a conductive strip line. The current going through the strip line is solved.
Then the eventual joule loss and temperature rise are solved.
The temperature change over time is viewed with this transient analysis.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Select the transient analysis.
Item |
Settings |
Solver |
Electric field – thermal coupled analysis [Curie} |
Analysis Type |
Transient analysis |
Tabs |
Setting Item |
Settings |
Transient analysis |
Time step |
Manual |
Time step |
1.0^-3[s] |
|
Calculation steps |
10 |
|
Initial Temperature |
25[deg] |
The conductive strip is a solid body in this exercise.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
Board |
001_Alumina * |
6/Solid |
StripLine |
008_Cu * |
* Available from the Material DB
It is assumed that there is no current flow in the alumina substrate.
Body Attribute Name |
Thickness/Width |
Analysis Domain |
Board |
|
Usable Domains: Deselect “For use in electric field analysis” |
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)
(This doesn’t affect the simulation) Set the specific heat of 001_Alumina as follows.
Material Name |
Specific Heat |
Resistivity |
001_Alumina |
1.0[J/Kg/deg] |
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.
In Boundary conditions, V0 and V1, define the voltage at each end of the strip
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/Face |
Electric |
Electric wall |
Waveform: Constant, Voltage: 0.00[V] |
V1/Face |
Electric |
Electric wall |
Waveform: Constant, Voltage: 0.01[V] |
Outer Boundary Condition * |
Thermal |
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 temperature distribution at lapsed time 0.002[s] is shown below.
The temperature distribution at lapsed time 0.006[s] is shown below.
The temperature distribution at lapsed time 0.010[s] is shown below.
The temperature around the thin film conducting line increases as the time passes.