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Define inlet BC for DQMOM

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Old   February 14, 2023, 10:15
Default Define inlet BC for DQMOM
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Hey,


I want to use a Water-Air Phasesystem with PBM DQMOM.
At the Multiphase Model PBM tab I define:


min Length = 0.001
max Length = 0.01
reference Length = 0.0063


When I Load PDF or Moment File i get:



QP0 QP1 QP2
Length (m) 8.54e-03 6.58e-03 5.07e-03
Volume Fraction 9.34e-02 3.34e-01 7.2e-02
DQMOM-m4 (m) 7.97e-04 2.20-03 3.65e-04


from moment-inversion.


In the next step I define inlet BC:


Air1: Vof = 0.0934, m4 = 0.000797
Air2: Vof = 0.334, m4 = 0.0022
Air3: Vof = 0.072, m4 = 0.000365


I want to calculate Sauter-Diameter in every timestep.
When i use these BC all of the 3 phases start at 0.001m sauter diameter. Especially in region of the inlet face sauter diameter of alle phases are 0.001 at the whole simulation time.
I expected values ~ Lengthfrom QP0-QP3


Does anybody have experiience with using DQMOM?
Thanks!
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Old   November 18, 2023, 10:00
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Tony Stark
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Hi whydi, have you already solved your problems, and what do you do for these
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boundary condition, dqmom, moments, population balance, sauter mean diameter

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