Hi,
The mass of a particular phase is computed by summing the product of phase density, cell volume, and phase volume fraction.
The mass-weighted average of a quantity is computed by dividing the summation of the product of density, cell volume, and the selected field variable by the summation of the product of density and cell volume.
Mass: You can determine the total mass of the mixture phase or an individual phase in the selected fluid zone
You can check ansys theory guide: 26.4.1. Computing Volume Integrals (ansys.com)
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