Volume Average, Surface Average, and Line Average
The derived average values are useful for calculating averaged quantities for each solution in a data set (a time-dependent solution, for example). Also apply an integral, maximum, or other operation to compute the maximum of an averaged quantity, for example.
Under Results, right-click Derived Values () or any Evaluation Group node (), and from the Average submenu select:
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Volume Average () to evaluate an average over a set of domains in 3D models. The result of the evaluation is stored in a Table node and displayed in the Table window.
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Surface Average () to evaluate an average over a set of domains in 2D, 2D axisymmetric, or boundaries in 3D.
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Line Average () to evaluate an average over a set of domains in 1D, boundaries in 2D, or edges in 3D.
Go to Common Results Node Settings for information about these sections: Data, Selection, Expressions, Integration Settings, and Data Series Operations.
For a line average example, see Tubular Reactor with Nonisothermal Cooling Jacket: Application Library path COMSOL_Multiphysics/Chemical_Engineering/tubular_reactor.