|August 31, 2013, 07:05||
Total time recommended for a DES
Join Date: Jul 2009
Location: Portsmouth, England
Posts: 480Rep Power: 15
I'm setting up a DES of the flow over a bluff body. Firstly, I have run steady RANS which is the starting condition of the DES. I have run three DES cases for 50 iterations each and at different timesteps to see which one would give CFL numbers below 1 (via Fluent's histogram). The largest timestep to achieved that was 1x10-5s.
Now I can set up the full simulation. But I'm unsure of the total time needed. If I estimate the residence time for a fluid element to pass through the domain at the freestream speed then that time is 0.08s. Let's say I let the simulation run for three times that duration (0.24s), then that would be 24,000 timepoints at the timestep of 1x10-5s.
Is that sensible? What have others done? Because it'll take along time to do this. Can a running average of important output data be set in Fluent?
|Thread||Thread Starter||Forum||Replies||Last Post|
|How to determine time step size and Max. iterations per time step.||pratik c||FLUENT||38||February 11, 2015 07:44|
|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|
|plot over time||fferroni||OpenFOAM Post-Processing||7||June 8, 2012 07:56|
|Total time for simulation||Meerkat||Main CFD Forum||1||September 5, 2011 07:17|