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

how can i fix reverse flow? jet impigment 3d modelling

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2021, 17:13
Smile how can i fix reverse flow? jet impigment 3d modelling
  #1
New Member
 
Mauro Killary
Join Date: Apr 2021
Posts: 6
Rep Power: 5
maurokillary13 is on a distinguished road
In context i'm simulating a 3d inclined plane, jet impigement, i decided to use this approach due to in next steps of my work i need to evaluate particle trajectories (DPM analysis, erosion analysis), the problem is transient so decided to take care with the courant number so i use a size of time step of 3e-6 and 1.5 e-6, i know the depency of the mesh with the courant number and the velocity (17 m/s in this case) so i try to put a "bed" to avoid the effect of the reverse flow at the outlet, also i use a good size in the wall to evaluate the boundary layer Y+ (i used a typical equations based on the Reynolds numer), i used pressure outlet or outflow boundary but in the two cases "reverse flow" appear (also the relation H/D is too short, 1 in this case) i hope a core of the jet not a developed region, the cuestion here is in what is the ralation in my result if i keep this reverse flow, the issue too is that the convegence is still remain (i used a 1e-6 value for residuals).

Is true mantain this approach because anyways a reach a convergence (only residuals, not constant pressure at the wall)

Additionally i use a report plot to monotoring the pressure in the wall impingement but this mantain a occilatory behavior until around 0.004 seconds.

I let you two screen of the mesh and the fluent GUI [IMG][/IMG]
maurokillary13 is offline   Reply With Quote

Reply

Tags
courant number, jet impingment, reversed flow, transient 3d

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
About Some Concepts:Laminar flow, turbulent flow, steady flow and time-dependent flow Jing Main CFD Forum 8 October 5, 2018 17:02
OpenFOAM - Reverse flow occur while ozgunoglu OpenFOAM Running, Solving & CFD 1 February 6, 2017 07:21
Laminar Wall Jet Flow over a Shallow Cavity javadkz FLUENT 0 October 3, 2016 02:41
Convergence of jet flow simulation MiraLisa FLUENT 0 August 15, 2013 04:44
momentum & x-vel convergence, and reverse flow problem cinwendy FLUENT 0 April 17, 2013 02:19


All times are GMT -4. The time now is 09:39.