Home / Examples / Coupled Analysis / Electromagnetic-Thermal Analysis [Hertz/Watt] / Example 1: Microwave Oven
The heating of a piece of meat on the bone placed in a microwave oven is simulated.
It is solved by coupling the electromagnetic analysis with the thermal analysis.
Unless specified in the list below, the default conditions will be applied.
Results will vary depending on Femtet version and the PC environment.
Item |
Settings |
Analysis Space |
3D |
Model Unit |
mm |
Item |
Settings |
Solver |
Electromagnetic Analysis [Hertz] Thermal Analysis [Watt] |
Analysis Type |
Electromagnetic Analysis: Harmonics Analysis Thermal Analysis: Steady-state Analysis |
Harmonic Analysis tab and Open Boundary tab are set as follows.
Tabs |
Setting Item |
Settings |
Mesh |
Mesh Size |
20 |
Element Type |
2nd-order Element |
|
Adaptive Mesh |
Off (to shorten the calculation time) |
|
Frequency-Dependent Meshing |
Reference Frequency: 2.45x109 [Hz] |
|
Harmonic Analysis |
Frequency |
Minimum: 2.45x109 [Hz] Maximum: 2.45x109 [Hz] |
Input |
10 [W] * |
* The power of actual microwave ovens is much higher than this.
The temperature distribution at steady state is analyzed in this example. Therefore, if the actual power is applied, the resulting temperature will be too high.
The input power is low to prevent it.
A waveguide is placed on the top of a cavity box. A port is set at the end of the waveguide.
The meat on the bone is placed on a plate. The temperature of the bottom face of CAVITY is 20 [deg].
Body Number/Type |
Body Attribute Name |
Material Name |
Mesh Size |
0/Solid |
CAVITY |
000_Air(*) |
|
5/Solid |
WAVEGUIDE |
000_Air(*) |
|
6/Sheet |
Imprinting body |
|
|
13/Solid |
PLATE |
PLATE |
8 |
75/Solid |
BONE |
BONE |
8 |
96/Solid |
MEAT |
WATER |
|
* Available from the material DB
Material Name |
Tab |
Properties |
PLATE |
Permittivity |
Relative Permittivity: 7.0 tanδ: 0.0 |
Thermal Conductivity |
1.5 [W/m/deg] |
|
BONE |
Permittivity |
Relative Permittivity: 7.0 tanδ: 0.1 |
Thermal Conductivity |
1.5 [W/m/deg] |
|
WATER |
Permittivity |
Relative Permittivity: 76.7 tanδ: 0.16 |
Thermal Conductivity |
1.5 [W/m/deg] |
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
PORT1/Face |
Electric |
Port |
Reference Impedance:
|
EW/Face |
Electric |
Electric Wall |
|
20deg/Face |
Electric |
Electric Wall |
|
Thermal |
Temperature |
20 [deg] |
|
Outer Boundary Condition |
Electric |
Electric Wall |
|
The default setting is [Magnetic Wall] for the electric boundary, and [Adiabatic] for the thermal boundary.
The model is well heated overall.
