CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

Define inlet BC for DQMOM

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   February 14, 2023, 10:15
Default Define inlet BC for DQMOM
New Member
Join Date: Oct 2022
Posts: 5
Rep Power: 3
whydi is on a distinguished road

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:

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?
whydi is offline   Reply With Quote

Old   November 18, 2023, 10:00
New Member
Tony Stark
Join Date: May 2022
Posts: 4
Rep Power: 3
Triskelion is on a distinguished road
Hi whydi, have you already solved your problems, and what do you do for these
Triskelion is offline   Reply With Quote


boundary condition, dqmom, moments, population balance, sauter mean diameter

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How can i define patch b.c. (inlet) on wall b.c. f.yldz OpenFOAM Pre-Processing 10 July 26, 2018 18:18
Laminar Kinetic Energy Model (Walters 2008) logoswort Fluent UDF and Scheme Programming 2 May 19, 2017 20:41
How to define a unsteady inlet boundary? zhao CFX 2 July 24, 2015 12:59
How to define different condition of inlet ?? kokey FLUENT 0 April 4, 2002 10:28
How to define the condition of inlet ?? kevin FLUENT 0 March 3, 2002 23:32

All times are GMT -4. The time now is 12:43.