CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Boundary Condition for 2D simulation of Turbo-machinery

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

LinkBack Thread Tools Display Modes
Old   January 16, 2017, 07:33
Exclamation Boundary Condition for 2D simulation of Turbo-machinery
New Member
Join Date: Jan 2017
Posts: 1
Rep Power: 0
vishal83 is on a distinguished road
Dear users,
This is first time i am doing a 2D analysis, since 3D un-steady analysis will involve huge computational time.
I am planning to do a 2D un-steady analysis to simulate the effect of on-coming wakes on LPT Vane boundary layer and blade loading by using Fluent. For simulating wakes I am using cylinder upstream of LPT Vane(picture enclosed).I have the following queries

1. What should be the boundary condition for LPT Vane Edges which I have marked with red line, if I am doing a 2D analysis how does I specify periodicity (rotational) or does it is required.Edges with black line are for inlet and outlet.
2. Same is for the hole mesh.
3. Does I have to do a axi-symmetric analysis or 2D planar.

I have attached two mesh pics one that of hole and other one for LPT Vane.
Thanks in advance for your valuable input.
Attached Images
File Type: png vane.PNG (19.6 KB, 4 views)
File Type: png hole for wake.PNG (13.2 KB, 4 views)
vishal83 is offline   Reply With Quote

Old   January 17, 2017, 19:07
Senior Member
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,919
Rep Power: 26
LuckyTran will become famous soon enoughLuckyTran will become famous soon enough
If I understand correctly, I guess you will do a sliding mesh and have a moving wake pass through?

You would not be able to do this in an axissymmetric simulation. This looks to be 2D-planar. I wonder if there is some cute transform or option to make it 2D-curvillear but I do not know off the top of my head.

  • Vane walls should be no-slip but moving walls. Remember to set the wall velocity.
  • Between vanes, edges of mesh should be periodic BC's with 0 pressure gradient.
  • And then inlets and outlets.
Are you sure you cannot afford it in 3D? You only need to resolve the wake passing frequency so the computational expense is not too bad in my opinion. But experience with the 2D case would be helpful.
LuckyTran is offline   Reply With Quote


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
Problem in setting Boundary Condition Madhatter92 CFX 12 January 12, 2016 05:39
Wrong flow in ratating domain problem Sanyo CFX 17 August 15, 2015 06:20
Radiation in semi-transparent media with surface-to-surface model? mpeppels CFX 10 June 16, 2015 15:48
several fields modified by single boundary condition schröder OpenFOAM Programming & Development 3 April 21, 2015 05:09
Difficulty In Setting Boundary Conditions Moinul Haque CFX 4 November 25, 2014 18:30

All times are GMT -4. The time now is 04:00.