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Old   October 27, 2014, 09:37
Default QMOM Boundary Values
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Laurens Tijsseling
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When using the QMOM method to solve the PBE's Fluent requires boundary values for each moment (0 to 5). After a thorough literature research I haven't been able to find how to compute these boundary values.

Anyone with a solution?
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Old   September 23, 2015, 21:50
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Meng Liu
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Quote:
Originally Posted by l.tijsseling View Post
When using the QMOM method to solve the PBE's Fluent requires boundary values for each moment (0 to 5). After a thorough literature research I haven't been able to find how to compute these boundary values.

Anyone with a solution?
Now,do you know how to set boundary values?
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Old   October 9, 2015, 06:23
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Laurens Tijsseling
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Yes I did! Have you found them yet or do you need help?
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Old   October 9, 2015, 07:13
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Yes,I need! What's the principle to set the BC values of moments. Did your simulation results coincide with your expectations? Did you ever try DQMOM method?
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Old   October 9, 2015, 07:20
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Yes,I need! What's the principle to set the BC values of moments. Did your simulation results coincide with your expectations? Did you ever try DQMOM method?
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Old   October 9, 2015, 08:41
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They did eventually agree with the expected results. I have not used the DQMOM, as I was only working with two phases.

You know moment-0 is the number of bubbles, moment-1 the total length, moment-2 the total area and moment-3 the total volume. You need these values in #/m3. The parameter you decide is the diameter of the bubble.

Please note that moment-3 has the same value regardless of the bubble diameter.
As I only specified boundary conditions at the inlet, moment-0 was 1/volume one bubble and the others can be deduced from there.

I achieved most succes using the Luo coalescence and break up kernel.
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Old   October 9, 2015, 08:58
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Sorry, I can't understand what you mean by the following. Can you explain it in detail?

“You need these values in #/m3. The parameter you decide is the diameter of the bubble.

Please note that moment-3 has the same value regardless of the bubble diameter.
As I only specified boundary conditions at the inlet, moment-0 was 1/volume one bubble and the others can be deduced from there”
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Old   October 9, 2015, 09:13
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I'll send you a PM for contact details.
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Old   October 9, 2015, 21:02
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Meng Liu
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OK, thank you. Or you can send me an email. My email is nel86@qq.com.
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Old   December 5, 2015, 01:07
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wubin
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Quote:
Originally Posted by l.tijsseling View Post
When using the QMOM method to solve the PBE's Fluent requires boundary values for each moment (0 to 5). After a thorough literature research I haven't been able to find how to compute these boundary values.

Anyone with a solution?
Hellow, have you meet the trouble about adding correction term into sorce term? I don't know how to add it reasonablely.
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Old   May 5, 2016, 00:00
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Up this topic

Really need the answer tho
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Old   November 14, 2017, 01:57
Default QMOM boundary moment values
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Chuchu Liang
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Quote:
Originally Posted by l.tijsseling View Post
They did eventually agree with the expected results. I have not used the DQMOM, as I was only working with two phases.

You know moment-0 is the number of bubbles, moment-1 the total length, moment-2 the total area and moment-3 the total volume. You need these values in #/m3. The parameter you decide is the diameter of the bubble.

Please note that moment-3 has the same value regardless of the bubble diameter.
As I only specified boundary conditions at the inlet, moment-0 was 1/volume one bubble and the others can be deduced from there.

I achieved most succes using the Luo coalescence and break up kernel.
You mean only the moment-0(1/one bubble volume) would be specified at the inlet when the DQMOM is used? Is the diameter of the bubble an averaged one? If the diameter of bubbles is a size distribution, how to set the boundary values? Thanks in advance
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Old   May 13, 2019, 00:40
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Dhiraj Lote
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Hello,
Can you please help me for reconstruction of bubble size distribution from QMOM
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Old   May 27, 2020, 04:05
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Wang Mengdie
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Quote:
Originally Posted by l.tijsseling View Post
They did eventually agree with the expected results. I have not used the DQMOM, as I was only working with two phases.

You know moment-0 is the number of bubbles, moment-1 the total length, moment-2 the total area and moment-3 the total volume. You need these values in #/m3. The parameter you decide is the diameter of the bubble.

Please note that moment-3 has the same value regardless of the bubble diameter.
As I only specified boundary conditions at the inlet, moment-0 was 1/volume one bubble and the others can be deduced from there.

I achieved most succes using the Luo coalescence and break up kernel.
hello, I have questions about setting boundary values at the inlet in DQMOM, I don't konw how to set the moment4's value, can you give me a hand? Thank you in advance! my email:1025028835@qq.com
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