CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM

Laminar flow over a cylinder_lift and drag coefficient

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

Like Tree1Likes
  • 1 Post By ssmeherk

LinkBack Thread Tools Search this Thread Display Modes
Old   February 18, 2014, 07:29
Post Incorrect lift coefficient for laminar flow over a cylinder
New Member
Join Date: Jan 2014
Posts: 13
Rep Power: 12
ssmeherk is on a distinguished road
Hello all,

I am trying to match my results of drag and lift coefficients for flow over a cylinder with a standard benchmark result. After making few attempts, I could able to match the result only for drag coefficient. But, the lift coefficient result is 10 times more than the desired result. So, it is quite clear that something is seriously wrong with the set-up. Please look into my case here and help me with your suggestions.

Benchmark Case BC's are as follows:
Input: Re=20 ; nu = 0.001 ; initial velocity = 0.2 m/s ; Domain = 2D ; incompressible ; velocity-inlet ; do-nothing boundary conditions for outflow ; no-slip condition for top and bottom walls.
Output: Cd = 5.57 ; Cl = 0.01

The geometry has been made in icemcfd and imported into openfoam. I have used simplefoam solver. Though the simulation is getting converged, I could see time step continuity errors. How much does this effect the final result?

Reference area for cylinder = diameter of cylinder * span-wise length (in case of 2D).
Since OF converts 2D domain into 3D before solving it, how to determine the span-wise length? I tried to input the length of one grid cell (taken by OF) as span-wise length. I have uploaded important files of the case. Please give your feedback.






xerxes92005 likes this.

Last edited by ssmeherk; February 20, 2014 at 05:11. Reason: title not reflecting the content of my post
ssmeherk is offline   Reply With Quote


cylinder flow, drag coefficient, laminar, lift coefficient

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 19:08.