[archeoptyrx]

Hi All,

I am running a batch fluent job in a remote computer using a queuing system.

I asked fluent to write down the surface monitors to a file. ( pressure.out,velocity.out etc).

In CFX we can directly monitor the running jobs using the solver manager. I wanted to monitor a running fluent job somehow. How can we do it ?
Any advice would be of great use.

[rarnaunot]

I would like to know this also...

May we need to create a UDF??

[LuckyTran]

They are simply text files that you can open with any text editor and read.

I guess you are asking about how to monitor them visually. There is no Fluent utility that does this.

You need to read the .out files and plot them.
How you do that is really up to you and a general solution does not really exist because it depends on you. Use your favorite plotter. Excel. Matlab. GNUPLOT. whatever.

[rarnaunot]

Originally Posted by LuckyTran

They are simply text files that you can open with any text editor and read.

I guess you are asking about how to monitor them visually. There is no Fluent utility that does this.

You need to read the .out files and plot them.
How you do that is really up to you and a general solution does not really exist because it depends on you. Use your favorite plotter. Excel. Matlab. GNUPLOT. whatever.

Thanks a lot! But how it is possible to plot Residuals?? And what about UDM... Can we plot a UDM??

[archeoptyrx]

Originally Posted by rarnaunot

Thanks a lot! But how it is possible to plot Residuals?? And what about UDM... Can we plot a UDM??

Hi,

It is easy to write down the residuals to a file.

1. Create a scheme file with the below commands. Say "Residual.scm"
   (define port)
   (set! port (open-output-file "residuals.dat"))
   
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (car (list-ref (solver-residuals) i)))
   )
   (newline port)
   
2. When generating the case file. Navigate to calculation activities-->execute commands. Then enter the below commands.
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (cdr (list-ref (solver-residuals) i)))
   )
   (newline port)
   
3. Now when writing the journal file , include the load command to read the scheme file.
   
   ; JOURNAL FILE
   
   rc Test.cas
   
   (load "Residual.scm")
   
   iter ...
   
   wc Test.dat.gz

This will write the residuals to a .dat file which you can plot it externally.

Similarly if you want to write down other variables, define it in monitors and check "write file" box.

or navigate to Report Definitions ---> do the same you do it in monitors. Check only "write reports" . But do not check "plot report file" if you are running fluent in batch mode. I personally find this more useful then defining monitors. I believe this option is only there in newer versions.

[rarnaunot]

Originally Posted by archeoptyrx

Hi,

It is easy to write down the residuals to a file.

1. Create a scheme file with the below commands. Say "Residual.scm"
   (define port)
   (set! port (open-output-file "residuals.dat"))
   
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (car (list-ref (solver-residuals) i)))
   )
   (newline port)
   
2. When generating the case file. Navigate to calculation activities-->execute commands. Then enter the below commands.
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (cdr (list-ref (solver-residuals) i)))
   )
   (newline port)
   
3. Now when writing the journal file , include the load command to read the scheme file.
   
   ; JOURNAL FILE
   
   rc Test.cas
   
   (load "Residual.scm")
   
   iter ...
   
   wc Test.dat.gz

This will write the residuals to a .dat file which you can plot it externally.

Similarly if you want to write down other variables, define it in monitors and check "write file" box.

or navigate to Report Definitions ---> do the same you do it in monitors. Check only "write reports" . But do not check "plot report file" if you are running fluent in batch mode. I personally find this more useful then defining monitors. I believe this option is only there in newer versions.

Thanks archeoptyrx! I am trying this and it really helped me!

[LuckyTran]

I don't consider it a built-in function since you're basically writing your own text file. but thanks for the scheme file! Although I knew a scheme solution existed, not having one readily available is not very useful. It's also very hard to search for. I'll have to bookmark this thread. =)

Originally Posted by archeoptyrx

or navigate to Report Definitions ---> do the same you do it in monitors. Check only "write reports" . But do not check "plot report file" if you are running fluent in batch mode. I personally find this more useful then defining monitors. I believe this option is only there in newer versions.

That's good to know! I checked in v17 and it's not there. I'll chk 17.2 maybe tomorrow to see if it's there. If not, is this an 18 only feature? I'm really glad though that someone had to sense to add the feature.

[bilalhussain]

Originally Posted by archeoptyrx

Hi,

It is easy to write down the residuals to a file.

1. Create a scheme file with the below commands. Say "Residual.scm"
   (define port)
   (set! port (open-output-file "residuals.dat"))
   
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (car (list-ref (solver-residuals) i)))
   )
   (newline port)
   
2. When generating the case file. Navigate to calculation activities-->execute commands. Then enter the below commands.
   (do
   ((i 0 (+ i 1)))
   ((= i (length (solver-residuals))))
   (format port "~a ~2t" (cdr (list-ref (solver-residuals) i)))
   )
   (newline port)
   
3. Now when writing the journal file , include the load command to read the scheme file.
   
   ; JOURNAL FILE
   
   rc Test.cas
   
   (load "Residual.scm")
   
   iter ...
   
   wc Test.dat.gz

This will write the residuals to a .dat file which you can plot it externally.

Similarly if you want to write down other variables, define it in monitors and check "write file" box.

or navigate to Report Definitions ---> do the same you do it in monitors. Check only "write reports" . But do not check "plot report file" if you are running fluent in batch mode. I personally find this more useful then defining monitors. I believe this option is only there in newer versions.

Sir i write file in putty
rc case.cas
it 1000
wc case.cas
wd cas.dat
I also want to introduce .scm file in my ansys fluent and also want to set its parameters via commands please tell me commands related to this thanks

[archeoptyrx]

use load command. see step 3. I am not sure about the older versions of fluent.

[bilalhussain]

Originally Posted by archeoptyrx

use load command. see step 3. I am not sure about the older versions of fluent.

Sir now i load the scheme file
i want to active it
model>gasification calculator>update>ok >
sir i need above series of command so that I can run it.
or sir tell me how i save scheme file permanently with case file. thanks

[arjdk]

Originally Posted by rarnaunot

Thanks archeoptyrx! I am trying this and it really helped me!

This is an extremely useful script when doing transient simulations and wanting to check the residuals more closely.

However, one thing that I am missing is the iteration number. The reason is that an extra line of residual status is printed between time steps and line number does therefore not match up with the iteration number. The reason that is a problem is that it would be nice to compare the residuals to values outputted through the report definitions.

Does anyone know how to add the iteration number to the printet output?

[arjdk]

This is an extremely useful script when doing transient simulations and wanting to check the residuals more closely.

However, one thing that I am missing is the iteration number. The reason is that an extra line of residual status is printed between time steps and line number does therefore not match up with the iteration number. The reason that is a problem is that it would be nice to compare the residuals to values outputted through the report definitions.

Does anyone know how to add the iteration number to the printet output?