Tagged: ansysfluent, customfieldfunction, massfraction, multiphase


June 6, 2022 at 8:33 amFAQParticipant
Mass fraction of phasei can be evaluated using the following expression via customfieldfunction:
mass fraction of phasei = (phasei volume fraction)*(phasei density)/(mixturedensity) … Eq. (1)
where mixturedensity is another predefined customfieldfunction as mixturedensity = sum of [(phasei volume fraction)*(phasei density)] for all the phases “i” in the domain
For example, in a twophase simulation:
mixturedensity = (phase1 volume fraction * phase1 density) + (phase2 volume fraction * phase2 density) mass fraction of phase2 = (phase2 volume fraction)*(phase2 density)/(mixturedensity)
Note: To evaluate the average mass fraction of a phase across a flow boundary, it can be obtained using: mass fraction of phasei = (mass flow rate of phasei/mixture mass flow rate) … Eq. (2)
At a flow boundary, the massweighted average of the mass fraction values obtained using Eq.(1) will be nearly equal to that obtained using Eq.(2) if the interphase slip is negligible.

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