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.

Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center HighMounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center highmounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized KOmega) turbulence model offers a flexible, robust, generalpurpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
 Solver message during DPM calculation: “number of stepsize underflows during particle integration step is x”. What does it mean and how to get rid of it?
 ANSYS Fluent: Efficient Modeling of Spray Breakup using VOFtoDPM Transition
 ANSYS Fluent: Describing Cavitation in a Centrifugal Pump
 Simulation of Exhaust Gas Recirculation (EGR) Cooler with CFD
 ANSYS Fluent: Lifeboat Launch – Overset & Dynamic Meshes with the Volume of Fluid Model
 Mixing Tank Modeling in ANSYS Fluent
 Optimizing Solid Distribution in Continuous StirredTank Reactor
 ANSYS Fluent: Simulating Multiphase Mixing within a Sparging Tank – Part 1
 Hydrodynamics and Wave Impact Analysis
 Fluent: Simulating Multiphase Mixing within a Sparging Tank – Part 1
© 2023 Copyright ANSYS, Inc. All rights reserved.