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Hi All,
I am studying Nektar++ by following the tutorial of Incompressible
Navier-Stokes Solver in (
https://www.nektar.info/notebooks//tutorials/basics-incns-solver/)
I wrote the condition file (mysession.xml) following the direction in the
website.
But it didn't work. I guess that there were some info missing.
When I checked session2d.xml
<https://www.nektar.info/notebooks//tutorials/basics-incns-solver/session2d.…>
,
there was also some error.
So I couldn't see the correct working file.
How can I get the session file?
Please let me know.
Thanks,
Dongmyung Suh
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Hi all,
I am new to Nektar++, I was running tutorial: Incompressible Flow Simulation. When I tried to restart simulation by running code in 6.5 Optional additional tasks (Exercise1), it raised error
Initial Conditions:
- Field u: from file cyl2DMesh.fld
- Field v: from file cyl2DMesh.fld
- Field p: from file cyl2DMesh.fld
Fatal : Level 0 assertion violation
m_timestep < 0
I followed all instructions before, I’m not sure where I was wrong. It’s really confusing. Could you please help me with that? Thank you so much and have a good day.
Best,
Zhikang Dong
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Hi Everyone,
Upon running a nektar++ AcousticSolver job across multiple CPUS, i noticed
that the outputs for each check point are partitioned into separate .fld
files (each corresponds to a single node). Stored under say
"problemName_100.chk" folder.
My question is how might I restart a simulation given the partitioned mesh
data at each checkpoint and how to post-process the results into a single
.dat file using FieldConvert.
I have only noticed the instructions for single outputs.
Is there some kind of concatenation required?
Thank you.
*YiLin Liu *
*403-397-3457*
*liuyilin.liu(a)gmail.com <liuyilin.liu(a)gmail.com>*
MASc Student at CML <https://cml.mech.ubc.ca/> UBC
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Hi,
Creating a list of points on the surface of a bluff body is the best way to
monitor pressure points?
Is there a method to directly specify the entire boundary?
Thanks.
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Hi Everyone,
I was just wondering if there are specific flags or other instructions that
need to be set to compile nektar++ for multi-core processing.
The main reason is that I am trying to run a 16 core job and I am often
encountering a "c group out of memory" exception and I think it might be
due to me not compiling things properly for mullti-core processing.
Thank you
*YiLin Liu *
*403-397-3457*
*liuyilin.liu(a)gmail.com <liuyilin.liu(a)gmail.com>*
MASc Student at CML <https://cml.mech.ubc.ca/> UBC
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Hi Guys.
At the moment, I have generated my quadrilateral meshes with gmesh.
Are there other options? Is it possible to convert the quadrilateral meshes
generated by ICEM CFD for example?
I am trying to better control the quadrilateral mesh generation.
Gmesh is starting to turn into an annoying experience.
Thank you very much.
Alessandro
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Hi Everyone,
For 2D direct stability analysis of Nektar + +, when raising the NumSteps, I get different eigenvectors and I'm not sure which is correct (as shown in the figure).
TimeStep = 0.004 TimeStep = 0.004
NumSteps = 4250 NumSteps = 8250
[cid:image002.png@01D824E8.40318770] [cid:image006.png@01D824E8.40318770]
Why does NumSteps affect the results and how do I set its value?
Looking forward to your reply!
Best regards,
Xiangjun Shan
从 Windows 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>发送
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Hi Everyone,
One thing I am noticing with NEKTAR++ is that you specify the base flow
function in the configuration/xml file. However, both LEE and APE equations
require the estimation of the spatial gradients of the base flow. I was
wondering what method of approximation is used within NEKTAR++ as the
configuration files does not ask for an analytical expression of the
spatial gradients.
Thank you so much
*YiLin Liu *
*403-397-3457*
*liuyilin.liu(a)gmail.com <liuyilin.liu(a)gmail.com>*
MASc Student at CML <https://cml.mech.ubc.ca/> UBC
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Dear all,
When I solve the equation that has the gradient the C0 doesn't satisfy.
I want to know the function name that imposes C0. Is it
MultiplyByInvMassMatrix?
Best Regards,
Mohammad Reza
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Hi Nektar++ community,
I recently have been having issues using the stability analysis adjoint
module.
When running direct and adjoint stability analysis I would expect similar
eigenvalues to converge. This is seen in the tutorial for ‘Global Stability
Analysis: Cylinder Flow’.
[image: image.png][image: image.png]
Where the magnitude, frequency, and growth rate results are quite similar
in value for the adjoint and direct Evolution Operators.
However, from my own mesh and simulation of flow past a cylinder I get a
discrepancy in the modes between direct and adjoint stability.
Direct:
[image: image.png]
Adjoint:
[image: image.png]
My direct stability analysis simulation gives reasonable results; agreeing
with the results in the Nektar++ tutorial on direct stability of a
cylinder. But the adjoint stability modes are fairly different and don't
yield values close to the tutorial.
I have attached my case files for direct and adjoint stability. I would
appreciate some insight if anyone has an idea why I have this discrepancy
between direct and adjoint stability results.
Thank you,
Matt Duran
PhD student
University of Central Florida