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[FAQ]

The decision of using either mass flow-weighted averaging or area-weighted averaging of variables is left to the discretion of the user. However, a common approach to averaging variables is to use area-weighted averaging for static variables such as static pressure and static temperature, and to use mass flow-weighted averaging for total quantities such as total pressure and total temperature. The reasoning behind this is that static quantities are more closely related to area while total quantities have a dynamic component that’s related to velocity (which can be related to mass flow). In many cases, there may be little to no difference in using area versus mass flow-averaging. However, mass flow-averaging only makes sense on boundaries or surfaces through which flow can pass. On wall boundaries, only area-averaging would be appropriate.