COMSOL average calculation
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2013-05-01
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COMSOL Tutorial - Calculating an Average Value
There are several ways to calculate an average value using COMSOL. One of the simplest methods is demonstrated here:
Say we have a 2D, time-dependant model of a rectangle of some material that is being heated from multiple sides. The
model begins at 300K, the left side is set at 400K, the right side is 300K, the bottom is 250K, and the top is insulated. At
time = 5,000s, the model reports the following temperature distribution:
Since this model may be difficult to characterize using a simple line or point, we wish to calculate the average
temperature across the entire surface.
1) On the left pane, under Results, right click on the “Derived Values” category.
2) At the top of the list, look under “Average”, and select “Surface Average”.
(If the model were in 1 or 3 dimensions, we might consider selecting Line or Volume average)
3) In the options for this new Surface Average feature, you will need to select the surface you want to take the average
temperature across.
4) Under expression, make sure it has “T”, to indicate that we want to average the temperature. If the model is time-
dependant, leave the time selection to be “all”.
5) Press “Evaluate”
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