|May 18, 2015, 18:16||
Too small time step?
Join Date: Nov 2011
Posts: 4Rep Power: 7
I'm calculating heat transfer from hot air flow to a thin metal wire. Model is transient, and what I'm trying to find is a temperature response (step response) of mentioned wire.
In theory I should get something like this:
Model is defined quite precisely, but results are strongly depenent on time step size.
Air flow speed is constant almost everywhere and equal to 5m/s.
The smallest cell has size of 0.001mm. It is so small because metal wire is 0.01mm in diameter.
According to this data I set up the time step to 2e-7s, but results were completly ridiculous. I have prepared comparison of solutions with different time step sizes. It seems that solution which is the closest to experimental data is for time step much bigger than 2e-7s.
Could you tell me why it is so, and how should I find the proper time step?
Thank you for any of your help
|time step size|
|Thread||Thread Starter||Forum||Replies||Last Post|
|How to write k and epsilon before the abnormal end||xiuying||OpenFOAM Running, Solving & CFD||8||August 27, 2013 15:33|
|dynamic Mesh is faster than MRF????||sharonyue||OpenFOAM Running, Solving & CFD||14||August 26, 2013 07:47|
|same geometry,structured and unstructured mesh,different behaviour.||sharonyue||OpenFOAM Running, Solving & CFD||13||January 2, 2013 23:40|
|pisoFoam with k-epsilon turb blows up - Some questions||Heroic||OpenFOAM Running, Solving & CFD||26||December 17, 2012 04:34|
|AMI speed performance||danny123||OpenFOAM||19||October 24, 2012 07:44|