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

mixture multiphase model (convergent-divergent nozzle)

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

LinkBack Thread Tools Search this Thread Display Modes
Old   July 9, 2020, 13:24
Default mixture multiphase model (convergent-divergent nozzle)
New Member
Join Date: Jun 2020
Posts: 1
Rep Power: 0
Anwar Alzaareer is on a distinguished road
Hello everyone,

I'm doing a simulation for multiphase flow (mixture model) to validate paperís results.
By the way, in the paper, the authors used this setup:
- Separation implicit solver.
- SIMPLE scheme were applied to resolve pressure-velocity coupling equation.
- the k-ε two-equation turbulent model, standard wall functions were employed to the flow in near-wall region.
- The second-order upwind difference scheme was also applied to improve the computational accuracy by
discretizing the physical parameters of volume control interface.
- the convergence precision 10-6 of the residual monitor for energy equation.
- a mixture model was selected with inter-phase velocity slip taken into account.

- conversion of mass source and energy source were compiled by User Defined Function (UDF) and coupled to flow functions. ( I have problem in this point, so I used evap/cond Lee model)
The main problem that I faced is instability in the solution, while I find the under-relaxation factors and evaporation frequency so significant factors in the solution.
Hope someone who has the experiences in this can help me. So, please find attached pictures that compares between my results and the paperís result, and give me your feedback.

Attached Images
File Type: jpg Capture1.JPG (48.3 KB, 22 views)
File Type: jpg Capture2.JPG (46.4 KB, 12 views)
File Type: jpg Capture3.JPG (43.6 KB, 14 views)
File Type: jpg Capture4.JPG (51.3 KB, 12 views)
File Type: jpg Capture6.JPG (52.5 KB, 11 views)
Anwar Alzaareer is offline   Reply With Quote

Old   September 25, 2020, 03:15
New Member
Yafei Li
Join Date: Jul 2018
Location: CHIAN
Posts: 16
Rep Power: 7
lyfflynice is on a distinguished road
What fluid was used? how to set the density and sound speed of gas and liquid?
lyfflynice is offline   Reply With Quote


mixture model, multiphase

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
[swak4Foam] swakExpression not writing to log alexfells OpenFOAM Community Contributions 3 March 16, 2020 18:19
VOF model + mixture model + RAS or LES model ebtedaei OpenFOAM Running, Solving & CFD 23 May 12, 2018 03:36
Convergent Divergent Nozzle Hrishikesh Main CFD Forum 12 June 25, 2016 02:06
mixture model or multiphase model in my UDF? aleisia Fluent UDF and Scheme Programming 0 June 8, 2011 13:25
A question about UDF utility in mixture and multiphase model aleisia Fluent UDF and Scheme Programming 0 June 7, 2011 16:32

All times are GMT -4. The time now is 20:25.