CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Rotating Arm Simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 23, 2009, 10:56
Default Rotating Arm Simulation
  #1
Member
 
DT
Join Date: May 2009
Location: Lisbon
Posts: 37
Rep Power: 8
fluentnoob is on a distinguished road
Hi everyone,

I am trying to simulate a sphere rotating about a point, submerged in water. I have defined a domain around the sphere as fluid. Now I proceeded to solve for the forces etc. on the sphere in the following two ways:

Approach 1:
At the Inlet, defined the fluid velocity as angular, of the appropriate magnitude, and with the apt rotation axis. All this in absolute terms.

Approach 2:
At the Inlet, defined the fluid velocity as angular, of the appropriate magnitude, and with the apt rotation axis. Also, defined the sphere as rotating about the rotation axis. All this in absolute terms.

Could you please help me out over here and tell me which approach is correct? Would all the extra terms due to the circular motion (centrifugal force etc) be included in approach 2 and not 1? Please can anyone help me out with this?

By approach 2, wouldnt the viscous force increase? Because the velocity of the fluid relative to the sphere will increase and become the (velocity of the sphere + Tangential velocity of the fluid) right? So does that make the first approach correct? Does it take into account the centrifugal forces too?

Thank you in advance..
fluentnoob 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
ROTATING TURBINE BLADE SIMULATION Anant FLUENT 2 March 31, 2011 10:57
the rotating domain simulation lius Main CFD Forum 2 December 12, 2007 21:45
modification for rotating cylinder simulation zonexo Main CFD Forum 3 July 21, 2006 14:24
Wind turbine simulation Saturn FLUENT 1 June 16, 2006 02:12
Stirred tank with baffles simulation using single rotating reference frame M.Zhou FLUENT 1 March 5, 2000 16:01


All times are GMT -4. The time now is 00:06.