# Boundary Condition for 2D simulation of Turbo-machinery

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

January 16, 2017, 07:33
Boundary Condition for 2D simulation of Turbo-machinery
#1
New Member

Vishal
Join Date: Jan 2017
Posts: 1
Rep Power: 0
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.
Attached Images
 vane.PNG (19.6 KB, 4 views) hole for wake.PNG (13.2 KB, 4 views)

 January 17, 2017, 19:07 #2 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,919 Rep Power: 26 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.

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Madhatter92 CFX 12 January 12, 2016 05:39 Sanyo CFX 17 August 15, 2015 06:20 mpeppels CFX 10 June 16, 2015 15:48 schröder OpenFOAM Programming & Development 3 April 21, 2015 05:09 Moinul Haque CFX 4 November 25, 2014 18:30

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