CAE Software【Femtet】Murata Software Co., Ltd.
General
This is an example of the magnetic field-thermal analysis.
The joule loss due to the induction current is solved by magnetic analysis. The resulting temperature rise is calculated by thermal analysis.
The vectors of the magnetic field and the temperature distribution by the heating are viewed.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Item |
Settings |
Solvers |
Magnetic Field Analysis [Gauss] Thermal Analysis [Watt] |
Analysis Type |
Magnetic field analysis: Harmonic analysis Thermal analysis: Steady-state analysis |
Options |
N/A |
The frequency of the current is set to 10[kHz].
Tab |
Setting Item |
Settings |
Harmonic analysis |
Frequency |
Minimum: 10×10^3[Hz] Maximum: 10×10^3[Hz] |
Step |
Linear step: Division number: 0 |
Set the Mesh Tab as follows.
Select “Apply the surface impedance boundary” for faster calculation.
“Apply the surface impedance boundary” is selectable when there is no induced current on the conductor.
See “Frequency-Dependent Meshing” of [Mesh Tab].
Tab |
Setting Item |
Settings |
Mesh |
Meshing Setup |
Automatically set the general mesh size: Deselect General mesh size: 20[mm] |
Frequency-Dependent Meshing |
Reference frequency: 10×10^3[Hz] Surface treatment for conductors: Apply the surface impedance boundary |
Solid bodies of a frying pan (Metal) and a coil (Coil) are defined.
The automatically created ambient air is analyzed only in the magnetic field analysis, not in the thermal analysis.
Finer meshes are set on the area where the magnetic field changes drastically.
Body Number/Type |
Body Attribute Name |
Material Name |
1/Solid |
Coil1 |
008_Cu * |
3/Solid |
Coil2 |
008_Cu * |
11/Solid |
METAL |
METAL |
10/Solid |
Handle |
Wood |
* Available from the Material DB
The material properties are set up as follows:
Material Name |
Tab |
Properties |
Wood |
Thermal Conductivity |
Thermal Conductivity: 0.5[W/m/deg] |
METAL |
Permeability |
Relative Permeability: 5×10^3 |
Conductivity |
Conductivity Type: Conductor Conductivity: 1×10^7 |
|
Thermal Conductivity |
Thermal Conductivity: 80 |
Body attribute is set up as follows to apply current to the loop coil.
The analysis domain is the magnetic field analysis only as Coil is not used in the thermal analysis.
Body Attribute Name |
Tab |
Settings |
Coil |
Current |
Waveform: AC Current: 10[A] Turns: 20[Turns] Induced current: N/A Direction: Loop Coil/Magnetic Field Direction Direction Vector of Magnetic Field: X=0, Y=0, Z=1 |
Analysis Domain |
For use in magnetic field analysis |
“Natural convection (automatic calculation)” is set on the outer boundary condition (surrounding the frying pan in the case of the thermal analysis).
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
Outer Boundary Condition * |
Thermal |
Heat Transfer/Ambient Radiation |
Natural convection (automatic calculation) Room Temperature : 25[deg] |
To set Outer Boundary Condition, go to the [Model] tab
and click [Outer Boundary Condition] .
The vectors of the magnetic field are shown below.
The vectors of the current density are shown below.
The eddy current is induced in the pan.
The temperature contour as a result of Watt is shown below.
The temperature goes up to around 110[deg].