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

Reversed flow in the nozzle

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 29, 2016, 11:26
Default Reversed flow in the nozzle
New Member
Join Date: Mar 2016
Posts: 2
Rep Power: 0
mr07th is on a distinguished road
Hello everyone!
I am trying to simulate work of de Laval nozzle but I faced with a problem of reversed flow (which generates excess of the temperature and viscosity) in outlet. I have tried to solve this problem by means transfer of outlet from the nozzle but reversed flow appeared 200-300 iterations later. I am trying to solve with Inviscid and SST but this didn't help me.
Fluent's check mesh showed that mesh is good (max aspect ratio around 30, ortho skew 0.24, ortho qualiti 0.76).
So I screwed up bc and I can't understand what is wrong
I attached pictures with my settings.
If I set up operational pressure and gauge pressure (pressure outlet) as 0, I haven't problems with solving (reversed flow appears on inlet and after 300-400 iterations disappears) but this case for vacuum and I need solving for atmosphere. Anyone have any idea what is wrong ?
Attached Images
File Type: jpg 1.jpg (115.1 KB, 6 views)
File Type: jpg 2.jpg (83.9 KB, 6 views)
File Type: jpg 3.jpg (78.7 KB, 8 views)
File Type: jpg 4.jpg (90.6 KB, 5 views)
File Type: jpg 5.jpg (27.8 KB, 5 views)
mr07th is offline   Reply With Quote


fluent 17.1, pressure bc

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
Boundary conditions for flow in nozzle kgevers FLUENT 0 July 26, 2015 13:46
Simulation of a Multiphase flow in a Convergent-Divergent Nozzle RR16988 FLUENT 1 June 9, 2015 07:10
ask for help about the reversed flow yuhehuan FLUENT 3 January 9, 2013 06:30
calculate a nozzle flow using rhoCentralFoam hg2lf OpenFOAM 0 October 25, 2012 22:26
Reversed flow cyclone Mohsin FLUENT 0 August 7, 2012 21:46

All times are GMT -4. The time now is 06:36.