Basic Heating Module
Microwave heating analysis including loads rotation and translation, frequency tuning, heat flow and material parameters modification as a function of dissipated power.
QW-BHM (Basic Heating Module) for QuickWave 3D provides a novel regime of operating the FDTD solver: the possibility of simulating microwave heating problems.

The software has been prepared to work in sophisticated regimes, modelling rotation and movement of the heated load(s) even along complicated trajectories, etc. Transfer of the heat generated by electromagnetic fields can be modelled with external or internal Heat Transfer Module or by coupling QuickWave 3D simulations to external computational fluid dynamics packages.
QW-BHM automatically modifies media parameters in thousands of FDTD cells filled with different media and heated up differently - all accomplished in a matter of seconds!

Each "thermal" iteration requires many FDTD iterations to reach the new electromagnetic steady state starting from the previous steady state - but less than would be needed to reach the new steady state starting from the initial zero field distribution.
Special BHM functionalities:
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modification of material parameters as a function of dissipated energy
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modelling the rotation in domestic ovens
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movement of the heated object(s) in industrial applicators along complicated trajectories
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modelling of rotation of multiple objects rotating around different rotation axis and with different speeds
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modelling of movement of multiple objects along different trajectories
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modelling of the rotation of metal objects
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automatic tuning of the source to the deepest resonance in the considered frequency band (this option mimics the physical behaviour of the real microwave power sources like magnetrons)
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manual tuning of the source (user indicates the new frequency)
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automatic source parameters changing (frequency, amplitude and delay) in the consecutive heating steps, according to user specification, performed for each source separately
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Rieke display for SWR
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analysis of the heat transfer problems taking into account divided cells (internal Heat Flow Module using non-linear model)
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possibility of coupling Basic Heating Module with external applications modelling effects not supported in QW-BHM
Load Rotation
In a typical domestic microwave oven a more uniform temperature distribution within the load is obtained through rotating of the load during heating. Such slow movement of the heated object may to a great extent affect the temperature field. In order to maintain high computational accuracy also in such scenarios, the QW-BHM module has a built-in mechanism accounting for this effect.
The load rotation mechanism lets the user simulate heating of arbitrarily shaped objects rotating around any point chosen on the XY plane. Thanks to this feature it takes just a few mouse clicks to prepare all the data necessary to perform simulation of such problems for specified heating time during which the object is being rotated with a given angular speed.
Modelling of rotation around one rotation axis.
Modelling of rotation of multiple objects rotating around different rotation axes at different speeds.
Load Movement
Load rotation is the most popular temperature-equalising mechanism widely used in domestic microwave ovens. However, different types of load movements are also of interest and are used in the engineering practice or are experimented within research, e.g., linear translation is widespread in industrial tunnel installations. Basic Heating Module responds to those needs and allows for modelling the movement of many objects along different trajectories.
Microwave applicator moving above bituminous pavement.
The load movement mechanism available in Basic Heating Module allows one to simulate heating of arbitrarily shaped objects moving along user defined movement trajectory. The load movement regime allows modelling single and multiple objects movement, with objects moving along different movement trajectories.
Modelling of movement along an arbitrary trajectory.
Modelling of movement of multiple objects along different trajectories.
Source Parameters Switching
Basic Heating Module provides design engineers and researchers with a mechanism of source parameters switching. This regime is dedicated to microwave heating scenarios with solid-state sources characterised by separate frequencies, amplitudes, and phases.
In the consecutive heating steps, Basic Heating Module performs automatic modification of source parameters, according to user specification, made for each source separately.
Source Frequency Tuning
Basic Heating Module provides the tuning of the source frequency mechanism. This regime mimics the physical behaviour of various real power sources under various conditions. The most widespread microwave source, a magnetron, is an imperfect device gradually changing its frequency during the heating, and in fact it may even “jump” from one frequency to another.

Two modes of the source frequency tuning are available: automatic source tuning, which assumes that the source tunes automatically to the deepest resonance in the considered frequency band, and manual source tuning, which allows the user to manually indicate which frequency in the considered frequency band the source should be tuned to (should be the new source frequency).

The source frequency tuning mechanism perfectly responds to desing needs of novel microwave power applications with solid state power sources. In such desings the return loss versus frequency is typically monitored in time, and the source frequency is tuned by the dedicated controller, so as to maximise the matching or meet other application-specific requirements.
Rieke Chart for SWR
Basic Heating Module enables analysis of the heat transfer problems including phase changes. The applied algorithms allow for the heat flow analysis using non-linear model and taking into account the conformal meshing. Basic Heating Module accepts three basic boundary conditions in the heat transfer calculations: Dirichlet, Neumann, and Robin boundary conditions.
Heat Transfer Analysis
Basic Heating Module enables analysis of the heat transfer problems including phase changes. The applied algorithms allow for the heat flow analysis using non-linear model and taking into account the conformal meshing. Basic Heating Module accepts three basic boundary conditions in the heat transfer calculations: Dirichlet, Neumann, and Robin boundary conditions.