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

Earthquake time history in CFX

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 28, 2019, 20:24
Question Earthquake time history in CFX
  #1
Member
 
Aashi
Join Date: Dec 2018
Posts: 43
Rep Power: 5
Aashi171185 is on a distinguished road
Hey hello to every one i want to ask that is there any way to input acceleration vs time data in cfx as load e.g
acceleration vs time
0.2g at 1 sec
0.24g at 2 sec
0.3g at 3 sec
0.12g at 4 sec
and so on
Aashi171185 is offline   Reply With Quote

Old   January 29, 2019, 00:45
Default
  #2
Senior Member
 
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 9
urosgrivc is on a distinguished road
Yes, this can be easily done with user functions:

type: "user function" in the search above or google, it has been talked about a lot of times.
I have personally written it about 4 times already.

[slide 11 but do watch the whole video] -> https://slideplayer.com/slide/6255657/
urosgrivc is offline   Reply With Quote

Old   January 29, 2019, 18:02
Default Thanks sir
  #3
Member
 
Aashi
Join Date: Dec 2018
Posts: 43
Rep Power: 5
Aashi171185 is on a distinguished road
Thanks for your kind response God bless you
Aashi171185 is offline   Reply With Quote

Old   March 13, 2021, 05:28
Default Seismic Acceleration in CFX
  #4
New Member
 
Mahesh
Join Date: Mar 2020
Posts: 20
Rep Power: 4
mahesh1819 is on a distinguished road
Hi, Can anyone help how to input frequency (Hz) vs Acceleration (m/s^2) to CFX?
mahesh1819 is offline   Reply With Quote

Old   March 13, 2021, 10:00
Default
  #5
Senior Member
 
Kira
Join Date: Nov 2020
Location: Canada
Posts: 436
Rep Power: 6
aero_head is on a distinguished road
Quote:
Originally Posted by mahesh1819 View Post
Hi, Can anyone help how to input frequency (Hz) vs Acceleration (m/s^2) to CFX?
Do you mean you want to plot input frequency vs acceleration in CFX-Post? Because how to input them is explained by post #2.
aero_head is offline   Reply With Quote

Old   March 14, 2021, 22:53
Default
  #6
New Member
 
Mahesh
Join Date: Mar 2020
Posts: 20
Rep Power: 4
mahesh1819 is on a distinguished road
Quote:
Originally Posted by aero_head View Post
Do you mean you want to plot input frequency vs acceleration in CFX-Post? Because how to input them is explained by post #2.
HI, thanks for the reply. I came to know how to give frequency vs acceleration from post#2. But could not find the syntax about how to mention that function in gravity as shown in Fig-1. Please help
Attached Images
File Type: png Fig-1.png (15.0 KB, 6 views)
mahesh1819 is offline   Reply With Quote

Old   March 15, 2021, 03:40
Default
  #7
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,170
Rep Power: 134
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Be aware that defining varying accelerations, especially varying accelerations in multiple directions is not fully supported by CFX. In other words it introduces additional terms into the equations which are not accounted for. This is especially for multiple directions as this will introduce rotations and then things like centripetal and coriolis effects are ignored.

If you want to model this accurately you need to use moving mesh and make the mesh motion prescribe your accelerations. But the approach you are using may be accurate enough, depending on how significant the additional terms which are not included are in your case.
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
ghorrocks is offline   Reply With Quote

Reply

Tags
cfx & fluent

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
pressure in incompressible solvers e.g. simpleFoam chrizzl OpenFOAM Running, Solving & CFD 13 March 28, 2017 05:49
Micro Scale Pore, icoFoam gooya_kabir OpenFOAM Running, Solving & CFD 2 November 2, 2013 13:58
pisoFoam with k-epsilon turb blows up - Some questions Heroic OpenFOAM Running, Solving & CFD 26 December 17, 2012 03:34
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58


All times are GMT -4. The time now is 15:44.