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

Adaptive vs fixed time stepping and simulation time

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 7, 2023, 19:21
Question Adaptive vs fixed time stepping and simulation time
  #1
New Member
 
Lynn S.
Join Date: Mar 2023
Posts: 4
Rep Power: 3
LynnCFD is on a distinguished road
Dear friends,

for a couple days I have been trying to convert a stationary solution to an instationary solution by using a transient solver instead of a pseudo-transient solver.

I found the fastest convergence to be at 1e-08 seconds, with 50/iterations per time step. However, this takes a very long time, as I need to simulate a flow time of approximately 1.6e-03 seconds (so roughly 164500 iterations ). Larger time steps won't converge, were as the current time step does and only uses 7-10 iterations after a few time steps. Since there is no room to reduce the simulation time within the fixed time steps, I'm considering using adaptive time stepping to speed up the process. Will this work, and to what extend?

Also, can someone please explain the difference between the duration specification methods (total time, total time steps, incremental time, incremental time steps)?

I'm very new to CFD, so all information is welcome .

Many thanks in advance!
Lynn
LynnCFD is offline   Reply With Quote

Reply

Tags
adaptive, fixed, simulation time, stepping, time

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
User defined time step - Possible to put variable time stepping in it? maccheese Fluent UDF and Scheme Programming 19 June 4, 2018 09:49
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 05:36
Adaptive Time Stepping: First Update Time JuPa CFX 2 January 7, 2015 06:09
Adaptive time stepping .Thomas. Fluent UDF and Scheme Programming 2 August 28, 2014 10:18
CFX-10 - Adaptive Time Stepping James Date CFX 3 October 17, 2005 22:15


All times are GMT -4. The time now is 22:37.