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Hello,
I am trying to set-up a "HistoryPoints" filter in the AcousticSolver which is solving Linearized Euler Equations.
Unfotunately, this filter is never activated. The system is set-up to solve for 100 time steps and I wish to record values at points as well as lines. To start with, I played around with the points filter setup and this the format which I have used:
<FILTERS>
<FILTER TYPE="HistoryPoints">
<PARAM NAME="OutputFrequency">1</PARAM>
<PARAM NAME="Points">
-100 0 0
</PARAM>
</FILTER>
<FILTER TYPE="Checkpoint">
<PARAM NAME="OutputFile">IntermediateFields</PARAM>
<PARAM NAME="OutputFrequency">1</PARAM>
</FILTER>
</FILTERS>
For some reason, the .his files are never written but .chk files are.
What could I be doing wrong in my setup ?
Regards,
Ishan
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Hello,
I hope all is well with you.
I am using Nektar++ to solve for Linearized Euler Equations(LEE) using the Acoustic Solver.
I have tried to play around a bit w.r.t to the following issues but have been un-successful:
1. I have found a few tutorials where the solution re-start can be accomplished using .rst file which is supplied under the Initial Conditions field in the XML files. I have made a similar setup for the Acoustic Solver but I get this warning when I run the solver: Fatal : Level 0 assertion violation m_timestep < 0. This doesn't seem right because my time step is not less than zero. The .rst file was generated from .chk file of the last time step and, this file was supplied as the file from which the remaining time-steps should start.
2. Secondly, how can I generate a .bse file? Is this also a .chk or .fld file whose extension has been renamed ?
3. Is it possible to generate a .bse file with data from an external source ? What would be the right way to approach this ?
4. What would be the right way to convert 1D Gmsh to Nektar++ mesh using NekMesh ? I have got errors while doing this.
5. Finally, is there a forum where users can post questions ?
Thanks a lot for taking the time to read my email.
Regards,
Ishan
PGR
University of Leicester
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Hi, I am having some trouble with the compressible flow solver when I run
the attached case.
I am attaching the .xml file and the .out file
This is the error I am getting and don't know how to solve it:
Warning : Level 0 assertion violation
# Nonlinear solver not converge in DoImplicitSolve
* Newton-Its converged (RES=-nan Res/(DtRHS): -nan with 10 Non-Its)
Steps: 672 Time: 6.72000e-01 CPU Time: 10.604s
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
--------------------------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status,
thus causing
the job to be terminated. The first process to do so was:
Process name: [[52564,1],2]
Exit code: 1
--------------------------------------------------------------------------
Any Help or comment will be extremely appreciated.
Kind regards, Octavio Morales.
U-MOFABI, Facultad de Ingeniería UNAM
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Hi, I am having some trouble with the compressible flow solver when I run
the attached case.
I am attaching the .xml file and the .out file
This is the error I am getting and don't know how to solve it:
Warning : Level 0 assertion violation
# Nonlinear solver not converge in DoImplicitSolve
* Newton-Its converged (RES=-nan Res/(DtRHS): -nan with 10 Non-Its)
Steps: 672 Time: 6.72000e-01 CPU Time: 10.604s
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
Fatal : Level 0 assertion violation
NaN found during time integration.
--------------------------------------------------------------------------
Primary job terminated normally, but 1 process returned
a non-zero exit code. Per user-direction, the job has been aborted.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
mpirun detected that one or more processes exited with non-zero status,
thus causing
the job to be terminated. The first process to do so was:
Process name: [[52564,1],2]
Exit code: 1
--------------------------------------------------------------------------
Any Help or comment will be extremely appreciated.
Kind regards, Octavio Morales.
U-MOFABI, Facultad de Ingeniería UNAM
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Hi dear Nektar++ community. I am quite new with the Nektar software, I'm
mainly working with compressible flows at high high subsonic, transonic and
supersonic regimes. After reading the compressible flow solver section I
noticed the case of a NACA0012 profile @ M=0.8, I looked for the file in
the tutorial section but it's not there. ¿Is there any chance that you guys
please share the .xml file that outcomes that exact same solution? Any
information will be highly appreciated!
Have a nice day, Octavio Morales
U-MOFABI Facultad de Ingeniería UNAM
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Hi,
I'm new to this community and appreciate your help.
I'd like to know if I can create a driver that runs the time
integration scheme for a single time step. I can see that I can set the
number of steps, but there's no setter for the final time.
Thank you,
Ata
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Dear Nektar++ users and developers:
Hi, everyone, I am sorry to disturb. My question is about the calculation of the "Time-averaged fields" in filters. One of the input options is: "RestartFile", how should I use this option correctly?
For example:
I have five checkpoints such as s_1.chk, s_2.chk, s_3.chk, s_4.chk, s_5.chk, and their time-mean field s_avg.fld, besides the final output file s.fld.
Then, I want to continue my simulation, so I write s.fld as the initial condition function (in <FUNCTION NAME="InitialConditions">). At this time, I hope to use s_avg.fld as the restart file (in <PARAM NAME="RestartFile">s_avg.fld</PARAM>) of the time-average field filter to reduce the time consumption of the entire simulation process by utilizing all the results obtained.
I would like to ask users and developers whether I understand RestartFile option correctly (might it be used to take the original time-average field as the first snapshot in my process)? How could I correctly fill the filter section of the xml document.
Thank you very much and look forward to your reply.
Best Regards,
Wang Zhouyang
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Hi nektar-users,
I am trying to obtain tecplot readable formats from some Nek5000 outputs I
already have; using the FieldConvert utility available in Nektar++ (It also
supports the reading of data files from Nek5000 as claimed in the user
guide).
The command given to convert the nek5000 outputs to Nektar++ outputs is as
follows;
FieldConvert input.fld output.fld
However, the output format (ASCII) of nek5000 is actually .fld
followed by some numbers indicating the timesteps.
The output for each timestep is written separately.
FieldConvert fails to identify this format and listed the supported
formats as .fld or .fld5000 while the second one is given specifically
to read the Nek5000 outputs.
I am not sure whether this is an old format of nek5000; anyway I did
not find any information about this format online.
I would like to kno if anyone tried this or have an idea whether
FieldConvert still supports Nek5000 output files or not.
Any help will be deeply appreciated.
Thank you in advance.
*Warm regards,*
*Ajeesh Mohan T,*
*Doctoral Research Scholar,*
*IIT Bombay, Mumbai, India.*
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Hi nektar-users,
I am new to Nektar++ and just installed it in my Ubuntu 22.04 by compiling
from the source obtained from GitHub as instructed in the user guide. The
installation was successful without any errors and I tested it using *ctest*
command where all of the 760 test cases passed successfully (screenshot is
attached).
My primary objective is to obtain tecplot readable formats from some
Nek5000 outputs I already have; using the FieldConvert utility (It also
supports the reading of data files from Nek5000 as claimed in the user
guide).
However, the problem I am encountering is that the terminal does not
recognize the *FieldConvert* command. I am not able to find the issue
anywhere on the internet.
It will be very helpful if any of you can help me with this.
Thank you in advance.
*Warm regards,*
*Ajeesh Mohan T,*
*Doctoral Research Scholar,*
*IIT Bombay, Mumbai, India.*
[image: Nektar++_test.png]
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Dear All,
Recently, i tried to compile nektar++ with mpi. And i'm facing some issues
with the compilation. The problem seems to be that "MPI_SEND" is not found
as shown in the figure. Therefore, when i try to launch my applications on
multiple nodes on an HPC cluster i have problems.
If someone can help me i will be glad.
Thank you in advance,
Nicola