CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > Siemens > STAR-CCM+

Cylinder Mesh and Physics models!

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 28, 2012, 10:15
Question Cylinder Mesh and Physics models!
  #1
New Member
 
James
Join Date: Feb 2012
Posts: 11
Rep Power: 14
James88 is on a distinguished road
Hello!

I am undertaking a small side-module at my college involving Star CCM+.

Our task for this is to create a cylinder with vortex shedding off of it, we are meant to use a quite low reynolds number (I have chosen 200).

My questions are:
What would be the best meshing models for the cylinder? And what sizes would you advise for the best mix of good results, but not huuge simulation time?

What physics models should I use? I assume that because the Re number is low, the model should be Laminar, constant density, segregated flow etc?

Many thanks to you all!

Oh, and its a 2D model at the moment, maybe 3D later, are there any things I should change when transitioning between the two?

Thanks
James88 is offline   Reply With Quote

Old   February 28, 2012, 10:18
Default
  #2
New Member
 
James
Join Date: Feb 2012
Posts: 11
Rep Power: 14
James88 is on a distinguished road
oh and sorry for such a basic question

We all have to start somewhere!
James88 is offline   Reply With Quote

Old   February 29, 2012, 00:35
Default
  #3
Member
 
sanjay's Avatar
 
aerosapien
Join Date: Sep 2010
Posts: 59
Rep Power: 15
sanjay is on a distinguished road
try this >>>>> http://www.docstoc.com/docs/23537770...er-in-Star-CCM



regards
www.aerosapien.blogspot.com
sanjay is offline   Reply With Quote

Old   February 29, 2012, 07:35
Post
  #4
New Member
 
James
Join Date: Feb 2012
Posts: 11
Rep Power: 14
James88 is on a distinguished road
Quote:
Originally Posted by sanjay View Post
Hi Sanjay! Thanks for the response. That document is very useful for my mesh! I have even adapted it to use the trimmer wake refinement rather than the volume shape, so I am learning steadily!

My other question is, they are using a turbulent model, whereas I think mine should be modelled as laminar? (Because the Re is 200). BUT, a friend of mine just suggested we use a transient model, like k-epsilon with turbulence suppression before the cylinder, to model vortex shedding from the cylinder?
Do you back up his idea, or is he wrong? I am achieving shedding with laminar, but I am now concerned whether it should be modelled with turbulence!

Many thanks

Also, your blog is very interesting, aerospace is an area I am certainly looking to do a degree related to!
James88 is offline   Reply With Quote

Reply

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
how to set periodic boundary conditions Ganesh FLUENT 15 November 18, 2020 07:09
Gambit problems Althea FLUENT 22 January 4, 2017 04:19
1 Was FSI for a flow over a cylinder vmlxb6 CFX 17 May 16, 2011 03:29
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Iterative equation solvers in CFD Vitaly Bulgakov Main CFD Forum 32 March 1, 1999 12:11


All times are GMT -4. The time now is 20:14.