6.1.13                Average Temperature

QuickWave delivers a value of average temperature calculated separately for all media (lossy and lossless) included in the project. This feature is available for microwave heating simulations performed with the use of QW-3D and QW-BHM. The value of average temperature can be viewed in Average Temperature window. As mentioned above, the average temperature is calculated separately for each medium included in the simulation project. The Average Temperature window shows separately the list of media with non-zero density (both lossy and lossless) and those with zero density (both lossy and lossless). Note that medium density is specified in the Project Media window of the Input Interface. Since QuickWave allows FDTD cells filled by more than one medium, ambiguity of "density" to be assigned to such cells has to be resolved. Since the criterion is, that the dielectric medium of the highest "conductivity" decides whether a cell is "dense", the density of this medium is treated as "density" of the cell. Density assigned to metallic and PEC media is ignored in this consideration. "Conductivity" is understood as the sum of X, Y, and Z components of Sigma and SigmaM. The medium of highest "conductivity" in the above sense also becomes a dominant cell medium for QW-BHM operation.

QuickWave offers two types of average temperature, which differ in a calculation routine and interpretation:

• Arithmetic average temperature – it is calculated as a sum of temperature in all FDTD cells filled with a particular medium divided by a number of those cells:

• Volume average temperature – it is calculated as a sum of products of temperature in a FDTD cell and its volume, divided by an overall volume of the FDTD cells filled with a particular medium: