CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Uniform Flow around a cylinder

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 29, 2009, 11:18
Default
  #41
Senior Member
 
ZHOU Bin
Join Date: Mar 2009
Location: Nanjing/Shanghai/Torino, Nanjing/Shanghai/Piemente, China/Italy
Posts: 164
Rep Power: 8
zhoubinwx is on a distinguished road
Send a message via ICQ to zhoubinwx Send a message via MSN to zhoubinwx Send a message via Skype™ to zhoubinwx
Hi Santos,

That's great to hear from you. I think your computational domain will be smaller than mine. (maybe there will be difference for the influence from cylinder and from sphere).

I have other analytical solution for sphere. Please let me know if you need.

Best regards,

Bin
zhoubinwx is offline   Reply With Quote

Old   March 29, 2009, 13:58
Default
  #42
Senior Member
 
santos's Avatar
 
Jose Luis Santos
Join Date: Mar 2009
Location: Portugal
Posts: 213
Rep Power: 9
santos is on a distinguished road
Send a message via Skype™ to santos
Hi Bin,

I just finished a simulation with 1/40 ratio between sphere radius and channel height, and my Cd value deviates just 3% from Stokes law (in my previous attempts the error was higher for smaller channel height).

What analytical solution you have?

Regards,
Jose Santos
santos is offline   Reply With Quote

Old   March 30, 2009, 13:14
Default
  #43
Senior Member
 
ZHOU Bin
Join Date: Mar 2009
Location: Nanjing/Shanghai/Torino, Nanjing/Shanghai/Piemente, China/Italy
Posts: 164
Rep Power: 8
zhoubinwx is on a distinguished road
Send a message via ICQ to zhoubinwx Send a message via MSN to zhoubinwx Send a message via Skype™ to zhoubinwx
Hi, Santos,

The expression of different analytical solutions for sphere case is in my Vista system. I will email you tonight. Please accept it from Italy

Best regards,

Bin
zhoubinwx is offline   Reply With Quote

Old   March 31, 2009, 01:54
Default
  #44
Member
 
Marco Müller
Join Date: Mar 2009
Location: Germany
Posts: 94
Rep Power: 8
marico is on a distinguished road
Hi FOAMers,

I'm doing the same things around the cylinder. I previously ran a case with k-Epsilon around 1E+5 < Re < 1E+6 sucessfully.
Now I try to do the same with kOmegaSST model, but the solution is not fine, the forceCoefficients are not steady. Can someone please help me with the boundary conditions for k and omega ?! What about zeroGradient a Inlet for such a case?

Thank You
Marco
marico is offline   Reply With Quote

Old   March 31, 2009, 10:50
Default
  #45
lin
Senior Member
 
Hua Zen
Join Date: Mar 2009
Posts: 114
Rep Power: 8
lin is on a distinguished road
I'm not sure,but generally it seems to be a general rule to prescribe inlet values of turbulent quantites.You could guess the value or use the value from experimental results.
lin is offline   Reply With Quote

Reply

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
Air flow over a cylinder momentum_waves Main CFD Forum 1 November 17, 2008 21:54
Flow over a flat plate & Flow over a cylinder cfdxue Main CFD Forum 0 November 27, 2007 00:26
propeller in non-uniform flow ubik Main CFD Forum 0 February 20, 2007 07:28
Is an uniform flow possible for this geometry? Michael Hu FLUENT 1 April 13, 2006 22:11
Cylinder In Jet Flow patrick raj CFX 2 September 24, 2005 02:43


All times are GMT -4. The time now is 10:56.