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

Starting simulations after steady-state is reached

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 11, 2016, 16:53
Default Starting simulations after steady-state is reached
  #1
New Member
 
Join Date: May 2016
Posts: 4
Rep Power: 9
Fluidiculous is on a distinguished road
Hi,

I am simulating actuated flow in a fluid domain, which has to first converge to steady-state before actuation can be initiated. My intent is to study the varying effects of different actuation parameters.

Problem is, I run the simulation on multiple separate computers to see the effect of different types of actuation, and each simulation requires the solution to converge towards steady-state before the actuation can begin. So, what I end up with is 5 different sets of data whereby the first two-thirds of the solution is identical (converging towards the steady-state), and the last one-third unique (different actuation parameters).

Since I already have the solutions for the time-steps approaching convergence to steady state, could I in some way begin my simulation right at the already steady condition? This would save me a lot of time since it takes days for the simulation to reach steady state, and a lot of space for data that I already have and don't care for.

I tried making Fluent read the case and data files of a steady solution and then running it, but it is not working. Could someone explain how this could be done or point me in the right direction? Thanks!
Fluidiculous is offline   Reply With Quote

Old   July 12, 2016, 05:59
Default
  #2
Member
 
Join Date: Jun 2016
Posts: 66
Rep Power: 10
Zbynek is on a distinguished road
Hi,

What kind of error does Fluent give you when you read the case and data? Because that is exactly what you should do. Simply compute the steady-state once, copy the result to all your other machines, and in each session at each computer you just load the steady-state case and data. Then you change your setup so as to apply different actuation and start the simulation. It should be that easy.
Zbynek is offline   Reply With Quote

Reply

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
The difference between steady state and transient JuPa CFX 36 December 9, 2019 23:50
Different Pressure in steady state and tranisente simulation abcdefgh CFX 4 January 29, 2015 17:47
Steady state free surface flow in rotational closed system hilde CFX 5 January 21, 2015 17:47
Steady state verses Time accurate simulations Saud khashan Main CFD Forum 2 May 23, 2003 08:00
About the difference between steady and unsteady problems Lisa Main CFD Forum 11 July 5, 2000 15:37


All times are GMT -4. The time now is 09:56.