CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Help: On oscillating circular cylinder

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

Like Tree1Likes
  • 1 Post By sandip.sarkar

LinkBack Thread Tools Display Modes
Old   December 10, 2009, 08:28
Default Help: On oscillating circular cylinder
New Member
Join Date: Dec 2009
Location: Jamshedpur
Posts: 4
Rep Power: 10
sandip.sarkar is on a distinguished road
I am trying to solve 2D flow past a transversely oscillating cylinder in cross flow in non inertial frame of reference. In this non inertial frame, the mesh size is fixed and the whole domain will oscillate and move with the flow.Boundary conditions I have used are as follows:

At inlet:
Here, fe=Frequency of vibration, As=Amplitude, t=time

Top and bottom walls: (Free slip BC)


At cylinder surface: u=v=0(no slip)


Fully developed: du/dx=dv/dx=0

Here in non inertial frame of reference I have added one source term in u-momentum equation as:

du/dt + u(du/dx) + v(du/dy) = -(dp/dx) + (1/Re)*grad^2(u)+ (4*(pi^2)*(fe^2)*As*Sin(2*pi*fe*t))

At outlet I have used presuure=0

Iam stucking with that "what will be the boundary conditions of pressue at all the planes?" As because I have to stick with outlet pressue =0, for traction free exit.

Are the boundary conditions I am using true? Or any modifications required?

I will be so greatful if some one extends hands to suggest me a wayout.

Thanks in advance for your time to read the whole writeup and kind cooperation.
utkunun likes this.
sandip.sarkar is offline   Reply With Quote

Old   December 15, 2009, 09:04
Default Answer to the quarey
New Member
Join Date: Dec 2009
Location: Jamshedpur
Posts: 4
Rep Power: 10
sandip.sarkar is on a distinguished road
Dear Friends,

Thank you for giving your precious time to view the post on oscillating cylinder.After two weeks of continuous thinking and literature survey I have resolved the problem on pressure boundary conditions. Though the situation is non inertial frame of reference, the boundary conditions of pressure will be similar as inertial frame of reference. Specifically, the spatial gradient of pressure will be zero at all places, except at outlet, where Dirichlet boundary condition of pressure has to be imposed by zero value.
Now, I have started getting results!

Hope this information will be helpful for those who are working on similar type of problem.


sandip.sarkar 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
benchmark: flow over a circular cylinder goodegg Main CFD Forum 12 January 22, 2013 12:47
3D FLOW OVER A CIRCULAR CYLINDER Srinivas Mettu FLUENT 2 April 4, 2010 22:11
Solver and geometry choose for drag coefficient calculation around circular cylinder at large Re lin OpenFOAM Running, Solving & CFD 3 April 16, 2009 10:50
flow around circular cylinder...plz help yousef FLUENT 4 March 28, 2006 11:01
Turbulent steady flow around a circular cylinder Mirek Kabacinski FLUENT 0 July 23, 2003 18:40

All times are GMT -4. The time now is 18:53.