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How many time-steps are included in each .dat file for Fluent transient simulations? |
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March 30, 2015, 16:36 |
How many time-steps are included in each .dat file for Fluent transient simulations?
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#1 |
Senior Member
nm
Join Date: Mar 2013
Posts: 100
Rep Power: 13 |
I just discovered the hard way that fluent .dat written using the autosave function after particular intervals (every 40 iterations here) store different number of time steps.
This is quite annoying. For instance results written at 480 iterations contain times 320, 360,400, 440 and 480. Results written, at 360 only have 360 and 320. Results written at 320 have, 320,280 and 240? Why are the .dat files so inconsistent? I noticed this only after I imported them to CFDpost. Thanks for reading. |
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April 2, 2015, 08:45 |
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#2 |
Senior Member
nm
Join Date: Mar 2013
Posts: 100
Rep Power: 13 |
I figured out a few other ways to track and write down the transient results but this still bothers me.
Anyone got any idea what determines the number of time steps in a fluent dat file written during calculation? |
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April 3, 2015, 00:01 |
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#3 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,739
Rep Power: 66 |
I did not think it was ever possible for Fluent to save data from old time-steps in a single .dat file since the .dat file should contain only data of the current state.
If you are running transient simulation with 1st order backward differencing, then naturally the .dat file will contain data at the current time-step plus the previous time-step. If you are running 2nd order, then the .dat file should contain the current time-step (n), the previous time-step (n-1), and the one before the previous time-step (n-2). It shouldn't contain n-40 time-steps. I don't know how that happens. |
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April 3, 2015, 08:45 |
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#4 |
Senior Member
nm
Join Date: Mar 2013
Posts: 100
Rep Power: 13 |
Right? I am confused as well. I was using Tecplot all my life but recently had to switch to CFDpost. So post-proc of transient simulations is a pain.
Anyway this is what I get when I import ONE timestep dat. Different timestep dat files have different number of timesteps stored and it's completely random. temp1.PNG |
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September 20, 2016, 14:27 |
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#5 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
did you find solution to this problem?
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Tags |
data file, fluent 14.5.7, transient analysis |
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