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Query-HOW TO EXTRACT MONITOR PLOT DATA AND IMPORT ON CFD POST

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Old   June 7, 2016, 21:05
Default Query-HOW TO EXTRACT MONITOR PLOT DATA AND IMPORT ON CFD POST
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Faizan
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Hi,

I am using ANSYS 14.5 version. I am simulating particle flow velocity in supersonic nozzle. I included output back up at certain time step in CFX-solver while running. But I observed that at certain accumulated time steps particle velocity at nozzle exit is reaching to the highest value. It's a model out put and I don't know so I didn't put the back up at that time step.

Now I want to capture that highest particle velocity at that accumulated time step and plot that on CFD-Post as particle exit velocity as SOLVER BACKUP FILE.

1. I don't know option for taking back-up at certain accumulated step in CFX-Solver.

2. When I exported plot data in the velocity exit monitor then CFD-Post is not accepting the file format.

Please suggest about it. Any help/suggestion would be appreciated.

Thanks in advance.

Regards,

Faizan
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Old   June 8, 2016, 01:25
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First of all: are you running transient or steady-state? You are talking about 'backup files' and not of 'trn-files' so I assume you are running steady-state.
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Originally Posted by Mfaizan View Post
Now I want to capture that highest particle velocity at that accumulated time step and plot that on CFD-Post as particle exit velocity as SOLVER BACKUP FILE.

1. I don't know option for taking back-up at certain accumulated step in CFX-Solver.
You can set up the frequency of the backups in Pre. For example every 5 time steps. You can adjust that while running through the solver manager 'Dynamically edit the settings of the run in progress'. You can also set that the backups start after like 150 iterations or so.
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Originally Posted by Mfaizan View Post
2. When I exported plot data in the velocity exit monitor then CFD-Post is not accepting the file format.
Why would like to import your monitor data into Post? What are you trying to achieve?
http://xyproblem.info/

PS: WHY ARE YOU SHOUTING AT ME IN YOUR THREAD TITLE?! THIS COULD BE SEEN AS IMPOLITE!!!11oneoneeleven
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Old   June 8, 2016, 01:34
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Hi Maxim,

Thanks for your response.

I know about edit run in progress and taking back up. I also set the output backup at time step. Now the problem is that I got back up at 4000 and 5000 accumulated time step after finishing the simulation. I observe the highest particle velocity at 4562 accumulated time step. Now I don't know as how to create back up at 4562 accumulated time step.

When I plot the 5000 back up file I couldn't get the highest particle velocity.

Yes I am running steady state simulation. I imported the monitor plot data after setting the accumulated time step range until 4562 accumulated time step. But CFD- Post is not accepting that file format.

I hope I explained my requirement.

Any help would be much appreciated.

Thanks

Faizan
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Old   June 8, 2016, 02:01
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So what are you trying to achieve? Are you trying to load time step 4562 into Post so that you can evaluate the particle velocity at that time step? You need a backup/trn file of that time step in order to evaluate the results of that time step.
Please read this http://xyproblem.info/ and explain in other words what you are trying to do? Importing monitor data (csv file) from solver manager to Post doesn't make sense with my knowledge.
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Old   June 8, 2016, 19:55
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Hi Maxim,

Yes you are right I am trying to load time step 4562 into CFD-Post because in Solver I observed highest particle velocity at 4562. I need a file format of 4562 time step as per backup file format (.bak) so that CFD-post can open the solver file. In addition to that if you suggest to take a backup during simulation running so it is not possible because I put random particle injection in CFX-pre. So if I re-run the simulation I would not get the highest particle velocity at 4562 accumulated time step. it would be any other time step.

In CFD- Post I would make a line at nozzle center line axis with two point coordinates point 1 (0,0,122.5) and point 2 (0,0,262.5). This nozzle center line is my X- axis and location as well in CFD- post. On Y- axis I would put particle velocity.

I hope I have well explained my problem. The issue is the file format in CFX- Solver. Because solver is not creating the .bak file format at 4562 time step.

Any help would be much appreciated.

Thanks in advance,

Faizan
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Old   June 9, 2016, 02:37
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To my knowledge, there is no way to create .bak (or .trn) files AFTER your simulation is completed. If you only have backups created for time steps 4000 and 5000, you cannot get backup files from the time steps in between after the solver has stopped.

Therefore it is important to set the frequency of backups according to your needs BEFORE you run your simulation. Saving a backup every time step would fill up your hard drive quickly - so be careful

I have never used particle injections - maybe someone else knows a trick how to trigger saving backup files with a function/expression according to your random particle injection. Maybe there's a way?
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Old   June 9, 2016, 21:18
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Hi Maxim,

I have the same thought to take backups at frequently and re-run the model. I asked on forum to seek any expert advise of doing this smartly. I read somewhere that ANSYS recent release 17 has this facility to plot data between any two back up files. I am using ANSYS 14.5.

Anyway thanks for your time.

Regards,

Faizan
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