CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT > Fluent Multiphase

dpm problem

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 28, 2017, 17:52
Default dpm problem
  #1
Member
 
Danial
Join Date: Mar 2017
Posts: 40
Rep Power: 9
Danial1992 is on a distinguished road
dear friends,I am modeling a water flow which solid particles settle in channel. it is based on a paper, I did everthings but some thing is not clear to me.
"As a first step, the fluid mechanics problem was solved in the absence of particles to find the steady state flow field. The converged solution was defined as the solution for which the normalized residual for all variables was less than 10−6. In addition, the convergence was checked from the outflow rate calculated at each iteration of the run. The convergence was achieved when the flow rate calculated to exit the tank no longer changed. Then the particles, whose density and size could be assigned at will, are released from the inlet and are tracked along their trajectories.
The particles reaching the bottom were deemed trapped whereas the rest were considered escaped. Particle tracking is fast and 25,000 particles could be tracked in less than 10 min once the flow field had been computed.
The number of particles was selected after many trials in order to combine the solution accuracy with short computing time for convergence. Fig. 4 reveals that, as the number of particles increased from 2000 to 25,000, the number of iterations needed for the model to converge decreased, whereas an even higher number would not yield any significant improvement. Therefore, a number of 25,000 particles was selected as a suitable one. The converged solution was defined as the solution for which the normalized residual for all variables was less than 10−6. In addition, the convergence was checked from the particle number balance calculated at each iteration of the run. The convergence was achieved when the percentage of particles calculated to exit the tank no longer changed.
"

this is what have been said in that paper and also it is one way coupling. I did fluid modeling but I dont know how to define particle number.

pls help ((
best regards
Danial1992 is offline   Reply With Quote

Reply


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
Can I solve MRF problem with DPM (Discrete Phase Model) ? aminem OpenFOAM Running, Solving & CFD 2 July 1, 2020 19:04
a strange problem on DPM model zhengjimi FLUENT 1 March 3, 2015 12:44
DPM mass source problem maazulmosaid FLUENT 0 April 25, 2014 07:25
DPM Output Problem (Again...) DLINSA Fluent UDF and Scheme Programming 1 March 16, 2012 01:45
Problem in DPM Harpreet FLUENT 0 July 31, 2011 10:56


All times are GMT -4. The time now is 08:22.