CFD POST is taking a lot of time for loading the results from FLUENT

murali666 · January 21, 2022, 12:38

I simulated a 2D transient flow around a cylinder for 10000 time steps.

The results are autosaved for every time step. So i have 10000 .dat result files.

When I am trying to open the result files, CFD POST is loading, loading and loading and getting crashed.

I did the same simulation for 8000 time steps, then the CFD POST is able to load the results.

I am thinking that, CFD POST is unable to load the results when we have a lot of time steps. So I copied one of the result files (result file correspond to one time step) to another location and tried to open it in CFD POST but I ended up with an error "no corresponding case file could be found".

I need to open each file to export the data from it. Please help me with this issue.

AlexanderZ · January 24, 2022, 02:28

as far as I understand, you should write case files each time you wanna split the data, for instance you wanna load 4000 and other 4000 in separate session, so you need to save case file after 4000 and after 8000.

however, didn't test it before.

I recommend you to make pictures during simulations instead of saving data file so frequent, frankly speaking seems to be useless (too much data)

aiden_1995 · November 15, 2022, 06:57

i have some case and data saved by autosave in fluent but when i open them in cfd post i get only 1 dat file,how should i open transient results?

TCms19 · November 15, 2022, 10:51

I have a similar issue with a transient run: I am unsure how to load multiple timesteps for 1 run: If I choose multiple timesteps (.dats) via load results it loads them independently and I can't change between them using timestep selector.

January 21, 2022, 12:38	CFD POST is taking a lot of time for loading the results from FLUENT	#1
murali666 New Member Murali Krishnamraju Join Date: Jan 2022 Posts: 10 Rep Power: 4	I simulated a 2D transient flow around a cylinder for 10000 time steps. The results are autosaved for every time step. So i have 10000 .dat result files. When I am trying to open the result files, CFD POST is loading, loading and loading and getting crashed. I did the same simulation for 8000 time steps, then the CFD POST is able to load the results. I am thinking that, CFD POST is unable to load the results when we have a lot of time steps. So I copied one of the result files (result file correspond to one time step) to another location and tried to open it in CFD POST but I ended up with an error "no corresponding case file could be found". I need to open each file to export the data from it. Please help me with this issue.

January 24, 2022, 02:28		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	as far as I understand, you should write case files each time you wanna split the data, for instance you wanna load 4000 and other 4000 in separate session, so you need to save case file after 4000 and after 8000. however, didn't test it before. I recommend you to make pictures during simulations instead of saving data file so frequent, frankly speaking seems to be useless (too much data) __________________ best regards ****************************** press LIKE if this message was helpful

November 15, 2022, 06:57	how to open transient results in cfd	#3
aiden_1995 Member naji Join Date: Nov 2022 Posts: 37 Rep Power: 4	i have some case and data saved by autosave in fluent but when i open them in cfd post i get only 1 dat file,how should i open transient results?

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November 15, 2022, 10:51		#4
TCms19 New Member Join Date: Oct 2022 Location: France Posts: 6 Rep Power: 4	I have a similar issue with a transient run: I am unsure how to load multiple timesteps for 1 run: If I choose multiple timesteps (.dats) via load results it loads them independently and I can't change between them using timestep selector.