CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > CFX

3D flow past cylinder simulation

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 22, 2015, 14:44
Default 3D flow past cylinder simulation
  #1
New Member
 
Beril
Join Date: Mar 2015
Posts: 7
Rep Power: 11
Beecee is on a distinguished road
Hello everyone,

I am simulating 3D laminar flow around a cylinder on ANSYS CFX and have to look at the FFT graphs for different velocities all in the range of laminar flow (max Reynolds number is 1000). Should I write an expression for the velocity as a function or put in the velocities individually (when I do that I can't set the turbulence settings off and make it laminar - How do I fix that?)

Also, how should I find the vortex shedding frequency for different velocities? I have difficulty plotting the graph of amplitude against time and flow velocity against time.

Lastly what is the best way to do this simulation (will have to move on to the pulsating flow in the next steps)

Thank you so much for your help!
Beecee is offline   Reply With Quote

Old   March 22, 2015, 18:09
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,867
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
I do not understand your first question.

The simplest way to find the shedding frequency of the von Karmen vortex street is to put a monitor point in the middle of the wake, a diameter or two behind the cylinder. Get the monitor point to output velocity or pressure. Then export the monitor point data and do an FFT on it to get the frequency.

Your final question makes about as much sense as "how do you design a spaceship".
ghorrocks is offline   Reply With Quote

Reply

Tags
ansys, cylinder, fluid dynamics, frequency, vortex shedding

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
Fluent + flow past cylinder at Re=40 m.vegad Main CFD Forum 25 January 9, 2018 01:34
Flow past a cylinder. Help needed Lurapa Main CFD Forum 1 August 18, 2013 12:25
Drag Coefficient for flow past a Cylinder o_mars_2010 Main CFD Forum 0 April 18, 2013 07:17
FLUENT, flow past a circular cylinder Paul Reichl Main CFD Forum 16 December 8, 2012 16:21
CFD help: flow past cylinder harsha00711 Main CFD Forum 1 December 24, 2010 22:19


All times are GMT -4. The time now is 13:21.