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

tornado simulation in CFD

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 20, 2013, 04:31
Default tornado simulation in CFD
  #1
New Member
 
Zoheb Nasir
Join Date: Nov 2011
Location: London, Ontario
Posts: 7
Rep Power: 15
shoumo_30 is on a distinguished road
Hello everyone. I am trying to create a tornado inside a cylinder (2.07 m in height and .4m in radius. The lower part (height = .41m) of the cylinder is the velocity inlet for which I have a UDF function. Rest of the height is sidewall. I have pretty fine mesh near the base and also near the side wall so that I can use enhanced wall treatment. I also adapted the grid in fluent. although I am trying run an unsteady simulation my iteration shows some AMG divergance after sometimes. I am using Reynolds stress model and sidewall is free shear wall. Outlet is normal outflow (top of the cylinder). My mesh size is .025 but near the base and sidewall it is more fine. Thanks in advance for your helps.

Zoheb

Last edited by shoumo_30; April 20, 2013 at 12:52.
shoumo_30 is offline   Reply With Quote

Old   April 20, 2013, 18:07
Default cfd analysis of muffler for calculating bck pressure
  #2
New Member
 
mohit
Join Date: Apr 2013
Posts: 1
Rep Power: 0
mohit juneja is on a distinguished road
i m working on star ccm can any one tell me pls what are the inital conditions for exhaust muffler like what is the temo. value, inlet velocity, maSS FLOW RATE & WILL I HAVE TO GIVE ALL THESE VALUE OR ONLY ONE ?
mohit juneja is offline   Reply With Quote

Old   April 22, 2013, 05:26
Default
  #3
Senior Member
 
RodriguezFatz's Avatar
 
Philipp
Join Date: Jun 2011
Location: Germany
Posts: 1,297
Rep Power: 27
RodriguezFatz will become famous soon enough
Which solver do you use?
Also please tell us all discretization schemes.
__________________
The skeleton ran out of shampoo in the shower.
RodriguezFatz is offline   Reply With Quote

Old   December 7, 2017, 11:24
Default
  #4
Member
 
Ravindra Shende
Join Date: Feb 2011
Location: Pune, India
Posts: 45
Rep Power: 15
Ravindra Shende is on a distinguished road
Hi Zoheb,

I am not sure what is causing the divergence but I think the boundary condition at the top of the cylinder might have something to do with it.

At the top boundary you will have both inflow (at the center) and outflow (at the edges) as the tornado is forming in your unsteady simulations. I am not sure how well the normal outflow boundary condition will be able to handle this situation. The total mass inflow through the top surface should match the total mass outflow through the same surface at all time steps.

I hope this gives you something to think about (unless you have already given it a thought, in which case just ignore all this).
Ravindra Shende is offline   Reply With Quote

Reply

Tags
enhanced wall treatment, tornado, transient analysis


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
CPU selection (E5-2650) for CFD simulation songxguan Hardware 2 October 23, 2012 17:09
CFD simulation of Progressive cavity Pump MrinalKR Main CFD Forum 2 September 25, 2012 16:29
CFD simulation of Progressive cavity Pump MrinalKR CFX 4 September 13, 2012 08:36
Tornado Simulation ??? Boris Main CFD Forum 2 November 2, 2003 19:10
Solidification CFD simulation Min-Hua Wang FLUENT 0 February 28, 2001 18:40


All times are GMT -4. The time now is 08:09.