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

circular cylinder drag crisis, simpleFoam k-w SST model no expected results

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

LinkBack Thread Tools Search this Thread Display Modes
Old   March 20, 2019, 08:23
Default circular cylinder drag crisis, simpleFoam k-w SST model no expected results
New Member
Francisco Urbano
Join Date: Mar 2019
Posts: 1
Rep Power: 0
fur is on a distinguished road

I'm trying to reproduce the drag crisis for a circular cylinder 2D with simpleFoam. First I tried using spallartAllmaras model for turbulence but values didn't seem to work properly (later I read it is thought to study aerodinamic foils) so I changed to kOmegaSST.

I want to study my mesh sensitiveness with a laminar case before going deep into the transition to turbulent. I'm searching the solution for Reynolds number 1e5 (aproximately the last value before the crisis) so I set the velocity in 0.735 m/s.

However, when calculating the drag coefficient with, it oscillates around 0.89 (average calculated value) when expected value is around 1.2 (as shown by Wieselsberger, 1921).

I don't really know what's wrong with my case:
could it be the solvers?
could it be the boundary conditions?
is there anything I'm not taking in account?

One more thing, and I know this is quite subjective, when openning the case in paraview, movement of the body wake looks too fast for me.

Thanks for the help.
Attached Images
File Type: png cd_graph.png (9.4 KB, 23 views)
Attached Files
File Type: zip (8.5 KB, 8 views)
fur is offline   Reply With Quote

Old   August 4, 2019, 10:30
New Member
Join Date: Feb 2017
Posts: 6
Rep Power: 4
damu1414 is on a distinguished road
Hi, am working on a similar case. Why don't you try pisoFoam?
damu1414 is offline   Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Drag force coefficient too high for a flow past a cylinder using komega sst Scabbard OpenFOAM Running, Solving & CFD 37 March 21, 2016 17:16
wmake compiling Problem with OF1.5 openTom OpenFOAM Installation 4 May 3, 2009 15:44
simulation results for k-w model and SST model Li CFX 7 June 29, 2007 05:19
DecomposePar links against liblamso0 with OpenMPI jens_klostermann OpenFOAM Bugs 11 June 28, 2007 18:51
Drag Coefficient(Cd) of circular cylinder Ram FLUENT 2 June 4, 2000 15:32

All times are GMT -4. The time now is 21:50.