CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

solidBodyMotionFunction SDA

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 29, 2014, 08:06
Default solidBodyMotionFunction SDA
  #1
New Member
 
Lilly
Join Date: May 2014
Posts: 9
Rep Power: 4
5tern is on a distinguished road
Dear OpenFOAMers,

I'm trying to simulate roll motion of a box. It is completely surrounded by water and my aim is to apply a pure sinusoidal roll motion on it (where I define frequency or time period, and amplitude).

I used the dynamicMeshDict with solidBodyMotionFunction SDA (more information: http://www.tfd.chalmers.se/~hani/kur...reeSurface.pdf).

Now my problem is, that the resulting moment has a shorter period (/lower frequency) than the applied one, which is not logical. I tried to understand the code behind the SDA, but I am not sure what to do if I want a constant roll motion.

In the attachment you will find a diagram where you can see the amplitude growing, while the time period decreases. After more than 15s I usually get a sawtooth-signal...

Thanks in advance!
Attached Files
File Type: pdf MATLAB.pdf (35.2 KB, 16 views)
5tern is offline   Reply With Quote

Reply

Tags
roll motion, sda, solidbodymotionfunction

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
InterDyMFoam SDA SKA coefficients markc OpenFOAM Running, Solving & CFD 14 May 2, 2016 21:19
AMI speed performance danny123 OpenFOAM 19 October 24, 2012 07:44


All times are GMT -4. The time now is 13:30.