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Auto — the default method, which computes the integral for fields by numerical integration and for reaction forces by summation. Predefined quantities for reaction forces use summation instead of integration. Also, if an expression is specified for the integrand using the reacf operator, the automatic setting chooses the summation method.
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For 2D axisymmetric models, Volume Integration and Surface Integration are available and active by default. COMSOL Multiphysics multiplies the expression (integrand) with 2*pi*r prior to integration to compute the corresponding volume or surface integral if you do the next step.
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Reaction force variables in axisymmetric models include the 2πr factor, so summation over them always gives you the revolved surface force or volume force.
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