CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[GAMBIT] Problem with split option

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 21, 2014, 02:45
Default
  #21
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,964
Rep Power: 30
-mAx- will become famous soon enough
did you see this tutorial: https://www.sharcnet.ca/Software/Flu.../tg/node23.htm

I think you have to set your periodic BC with mass flow rate (as you already did), but I am not agree as you writing that du/dy= 0.
If you impose the massflow, then in the middle (0.5*l1) of your domain you have the critical section and your fluid will accelerate for maintaining same massflow.
Do you already have some results? can you display the velocity distribution?
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   January 21, 2014, 04:17
Default Concept of periodic conditions
  #22
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Hi
Thanks for the response.
1.I have gone through the tutorial you suggested before starting my work.
2.I have done the tutorial for the developed flow through pipes.
for both of the above cases,same periodic conditions with pressure drop will be given.
In the second case,there is no change in the velocity profile (du/dy=0) after simulation.
In the first case,du/dy should not be the same.But we follow the same procedure of giving periodic conditions as that was done for case2.
How are this happening?
myaccount is offline   Reply With Quote

Old   January 21, 2014, 04:43
Default
  #23
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,964
Rep Power: 30
-mAx- will become famous soon enough
display velocity and pressure distribution
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   January 21, 2014, 05:49
Default Concept of periodic conditions
  #24
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Hi
Thanks for the reply.Please find attached the contours of X velocity,and pressure. mass flow rate is 0.0003575kg/s
Attached Files
File Type: docx tecplot.docx (33.8 KB, 1 views)
myaccount is offline   Reply With Quote

Old   January 21, 2014, 06:12
Default
  #25
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,964
Rep Power: 30
-mAx- will become famous soon enough
if you set the max velocity very low in the scale , do you see any velocity between all your squares?
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   January 22, 2014, 05:07
Default Concept of periodic conditions
  #26
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Hi MAx,
How can we use same periodic conditions to
1.flow with a pressure drop,which is geometrically periodic in nature,and is not fully developed(like the model in fig 4.2 which I use for simulation).
and also to
2.Flow with a pressure drop,and fully developed flow(like fully developed flow through circular pipe)
Iam getting confused.
myaccount is offline   Reply With Quote

Old   January 22, 2014, 05:44
Default
  #27
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,964
Rep Power: 30
-mAx- will become famous soon enough
I don't know.
I am not experienced with periodic flow.
Did you check if you get velocity distribution between your solid squares ?
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   January 22, 2014, 06:00
Default
  #28
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Max, I also have one more doubt.. I am studying the heat transfer rate within an isothermal medium which is not moving(still) and it s at temp T1. The medium is confined within two large black isothermal walls of temp T2.
If we have to specify a wall as isothermAL, we can just give the value of the temperature in boundary conditions>>edit>>thermal >>thermal conditions>>temperature....

Am i right??

And if we want to specify a medium (fluid /solid) as isothermal, how to give a specified temperature for that? Because in boundary conditions panel, for solid or fluid, we can only edit the name and nothing else.. plssssssssssss tell me how to specify a still medium as isothermal... ?? Do we have to specify it in reference values section ?? or do we have to give it under cell zone conditions>>edit>>Fixed values>>Temperature ???

I tried it with fixed value once an as i am wrking in radiation heat transfer problems, i dont think I am right...

plsssssssssssss give me ur suggestions, max... I badly need it..
myaccount is offline   Reply With Quote

Old   January 22, 2014, 06:11
Default
  #29
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,964
Rep Power: 30
-mAx- will become famous soon enough
I suggest you to open a new thread in the fluent subforum
You will have more chance to have answer of your thermal question
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   March 25, 2014, 01:00
Default pressure drop in periodic flow
  #30
Member
 
Join Date: Dec 2013
Posts: 53
Rep Power: 3
myaccount is on a distinguished road
Hi Max,
I have simulated flow over solids through a channel.I have applied periodic boundary conditions at the inlet and exit of the pipe. Can I use the pressure drop indicated in periodic boundary conditions menu after the convergence of the case as pressure drop /L for my further work?
Can you please clarify.
myaccount is offline   Reply With Quote

Reply

Tags
gambit, geometry

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Please Help.....Insufficient Catalogue Size Paresh Jain CFX 17 March 11, 2014 12:40
Convective Heat Transfer - Heat Exchanger Mark CFX 6 November 15, 2004 16:55
Please help with flow around car modelling! Tudor Miron CFX 17 March 19, 2004 20:23
Multi Phase option problem.... Christos Sfyris CD-adapco 1 May 22, 2003 07:53
Replace periodic by inlet-outlet pair lego CFX 3 November 5, 2002 21:09


All times are GMT -4. The time now is 23:37.