Learning Forum

[mossaied2]

Hello

I was running some simulation with ansys fluent, and after more than 8 hours I just found that ansys fluent setup model window is closed. I do not know if the simulation finished or not but in any case I wanna retrieve any results it stopped at. So how to do this. 

Thanks 

[Pablo Aguado]

Hi Mossaied,

Fluent interactive session does not close after the simulation. I am afraid you need to provide more details to be able to help you. Did you launch it interactively? Is the process still running under Task Manager? Can you check if any files have been written to the working directory? What process did you follow to set and launch your simulation?

Regards,

[Karthik Remella]

Hello,

Before you start running your simulation, I'd suggest that you write your transcript file. Here is a screenshot which explains Fluent transcript file. This might help you understand the reason for the crash.

About retrieving your simulation results, are you saving your results periodically as Fluent is generating the results. If you are not already writing the .cas and .dat files periodically, I'd strongly recommend that you do this. This way, you should be able to read the last written file and carry on with your simulation from there. You can do this from: Solution -> Calculation Activities -> Autosave every If you are running a steady state simulation, you should be able to save every N iterations, and for a transient simulation, it would provide you with an option of saving every N time-steps.

I hope this helps.

Best Regards,

Karthik

[mossaied2]

Thanks for the reply Paguado

Did you launch it interactively? I really have no idea about interactive sessions, so probably not

Is the process still running under Task Manager? no 

Can you check if any files have been written to the working directory? what exactly Paguado should I search for, could you plz give me a sample of that kind of files

What process did you follow to set and launch your simulation? I do not make any especial procedure and use the default, I mean just set number of iteration and press run keeping all other settings to default 

[mossaied2]

I remember I was saving each iteration Mr Kremella, so how to retrieve .cas and .dat files to start from the result I got.

Thanks

[Karthik Remella]

Hello, 

Are you working in the WorkBench environment? Or are you using Fluent as a standalone? Are you running Fluent on the cluster as batch mode? Could you please let us know how you are running Fluent? Perhaps, a screenshot?

Thanks.

Best,

Karthik

[mossaied2]

Yes I was working inside Workbench environment but I do not know what is the difference between cluster and batch mode as I am new to fluent.

Now I think after opening the project file .wbpj I could not find the fluent flow that was running last time it was in the red circle I drew in the following screenshot

 

[Rob]

If WorkBench crashed there's usually an option to recover files when you relaunch: alternatively look in the scratch/temp folder (in WorkBench look at Tools -> Options  -> Project Management). If there's nothing there the files may not have been saved. 

I recommend saving the project before you start a simulation as there's less chance of you losing your work. 

[Keyur Kanade]

please check following folder of workbench file where you may get latest case and data files. 

[file path]name_filesdp0FFFFluent

if files are not there then you may need to run it again. 

[mossaied2]

Hi Kkanade, actually this crashing problem happened when the computer sleeps and I discovered this today by chance and again there were a simulation running but this time I was following all the advices presented in this thread and I was saving results after 1000 iterations, so thanks to all. Although, I think I have the case but not data files stored in path you sent!, plz take a look at the following screenshot

I believe the case file is FFF-Setup-output.cas.gz but which of them is the data file? and what should I do next to not lose my results? I do not want to look at other forums not to make any mistake and lose 8 hours of work.  

Thanks 

 

[Keyur Kanade]

it does not have *.dat.gz file. 

i afraid that you will have to run it again. 

[mossaied2]

Thanks

Now I reran simulation  - for sorry - , and I set the autosave to be each 1 iteration, although I could not find the .dat.gz file in [file path]name_filesdp0FFFFluent , so what is the problem now? is it something wrong I did in the setup?

Thanks

[Karthik Remella]

Hello,

Please go to View -> Files in WB and this should display all the files in your simulation, along with the location. Please try to find the file there and see if you can narrow down on the location.

Thanks.

Best,

Karthik

[mossaied2]

THanks Karthik for the reply

I have found something strange when I open view -> files in wb, both .case and .dat where in red and x sign for both

so what dos that mean? should I reinstall ansys?

Thanks

 

[mossaied2]

Also this is my autosave window setup, I am saving the results each 1000 iterations, plz if there is something incorrect in it guide me

Thanks

[Keyur Kanade]

if you are auto saving after 1000 iterations, please make sure that you run more than 1000 iterations. 

please check if you have sufficient space on disk to write data files. also check %temp% area has sufficient space. 

[krishnaraj]

.

I have read all the questions and answers in this page, some of them raise dome serious questions ( I also suffer a lot when it happends to me). I dont think anyone properly answers those questions. when the computer get shutdown accidently ,the data file may or may not get lose. case file can be regain by importing case file from [file path] ame_filesackup file / dp0/FFF/fluent. data file will be there in [file path] ame_filesdp0FFFFluent. It is better to stope the calculation after every 2hr and save the project periodically. in my experience thats is only soluation. Otherwise someother explain the real method

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[Rob]

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If you run Fluent outside of Workbench and use autosave you will have files to return to if something saved before the model crashed. If you are running in Workbench and use autosave open the folder where the files were saved: do NOT open Workbench as that may revert to the last saved project, not when the last case & data files were saved. I'd also be looking very carefully at what is causing the hardware to shut down: that shouldn't be happening.

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[ianyylai]

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hi Rob by "open the folder where the files were saved", did you mean to open the files in dp0/FFF/fluent? But how do we gain access to those case and data since they are simply cxa, cas, or dat files instead of workbench files?

.

[Rob]

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Actually, the .cas and .dat files are the ones Fluent uses. Workbench is a project tool (with some extras) which then runs Fluent. If you open Fluent without Workbench you read in the case & data files. The case is the mesh and boundary conditions, the data is the flowfield.

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