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

Prediction of total time

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 11, 2013, 03:16
Default Prediction of total time
  #1
Member
 
Ali Mohamadi
Join Date: Aug 2012
Posts: 32
Rep Power: 4
Alimohamadi_nasr is on a distinguished road
is it possible to predict how long it takes to reach steady state solution in unsteady approach based on the residence time? (my favorite monitors shows constant or periodic shape)

For Example if residence time of a problem is 7*10^-3 [s], and it will be solved unsteady, after how long it will become steady if it has steady state solution.

I know it depends on the initial condition, but I want an estimation for it.
for example if its initial condition is its steady state or if we start from the first point?

I have a problem that is in laminar regime and I think its impossible to solve it in steady state mode, and papers also have unsteady approach, to have convergence. I choose dt=2.5*10^-7 [s] and it becomes converged in each time step (10^-5 for continuity and 10^-7 for velocity), it is 3D and I have started from steady state solution as initial condition. I want to know after how many time steps it becomes steady. I know it has steady state solution.

it is kind of instability flow.

Thank you very much
Alimohamadi_nasr is offline   Reply With Quote

Reply

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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Sudden jump in Courant number NJG OpenFOAM Running, Solving & CFD 7 May 15, 2014 13:52
Unstabil Simulation with chtMultiRegionFoam mbay101 OpenFOAM Running, Solving & CFD 13 December 28, 2013 14:12
Error in run Batch file saba1366 CFX 4 February 10, 2013 02:15
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM 6 April 12, 2011 11:24


All times are GMT -4. The time now is 02:17.