*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Hi,
I am looking at the periodic BC with a rotation in a 2D flow. I managed
to get NekMesh to work and align a PI-rotational boundary pair. I
included a Rotated tag in the BOUNDARYCONDITIONS (it seems the tag is
not used in 2D anyway), but what I get is not what I have expected.
Consider attached figure, I have an outflow on top-right, rotated to
bottom-right and I was expecting to see an inflow there.
I had a look at the DisConstField.ccp, and there is a small piece of
code setting everything up (~4,5k lines of code), and from what I
understand rotation is not accounted for in a 2D case.
My question is than:
1. Am I looking at the periodic-rotation BC in a wrong way?
2. Where are periodic BC enforced? I was unable to find the spot where I
could just plug a *-1 to reverse the flow.
Cheers,
Stan
--
Pozdrawiam,
dr inż. Stanisław Gepner,
*Wydział Mechaniczny Energetyki i Lotnictwa*
Nowowiejska 21/25 Str.
00-665 Warszawa, Polska
tel. +48 (22) 234 51 70
<http://www.pw.edu.pl/>
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
It is not immediately clear to me if the flowrate forcing is limited to
being applied to a single boundary?
e.g. will it work for a channel flow with multiple inlets and/or outlets?
or is it limited to a single boundary in the domain?
Regards,
~Kurt
--
Kurt Sansom
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Dear all:
I want to use the Nektar++ to conduct structural sensitivity analysis on the flow problem. I can get direct and adjoint modes, but I don't know how to get the sensitivity of base flow modification and local feedback (as shown in figure).
Can anyone help me?
Looking forward to your reply!
Best regards,
Xiangjun Shan
从 Windows 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>发送
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Dear all,
I am trying to calculate a base flow with the steady-state solver using selective frequency damping.
Recently, an error, shown in the picture below, was given when I tried to run in parallel the IncNavierStokesSolver for my new mesh-refined case using mpirun -np:
[cid:53ae808d-8f8c-4062-9c1e-374f9c477a1c]
However, this error has never occurred before when:
1.using serial running for the same session file/ setting of this mesh-refined case;
2.using parallel running for other cases so far, which are all with much coarser meshes;
So I want to know what triggered this kind of problem and how to deal with it.
Thanks in advance for the help.
Best regards,
Mona.
Dear all,
We are planning to hold the next Nektar++ workshop on the 13th-15th
December 2021 at Imperial College London. So please save the date!
The format will be hybrid and we plan to accommodate a fixed number of
in-person attendees as well as allowing others to participate remotely.
The main sessions of talks will likely be in the afternoon (UK time) to
allow as many of you to join as possible.
We are still finalising the details, but will put more information
online soon, including how to register.
We are looking forward to seeing as many of you as possible in London
and being able to catch-up with our community again!
Kind regards,
Chris
--
Chris Cantwell
Senior Lecturer in Aeronautics
Department of Aeronautics
Imperial College London
South Kensington Campus
London SW7 2AZ
Tel: +44 (0)20 759 45050
Email: c.cantwell(a)imperial.ac.uk
www.imperial.ac.uk/people/c.cantwell
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Hi All,
What is the proper way to specify a noise force and a body force at the
same time?
I am new to Nektar++, and am attempting to run a simulation of turbulent
channel flow using a body force to drive the bulk flow, and a noise force
to generate some initial "turbulent-like" fluctuations of the velocity
field. However, when I setup the case based on the details found in the
user guide (Forcing (nektar.info)
<https://doc.nektar.info/userguide/latest/user-guidese10.html#x16-810003.5> ),
the resulting flow field doesn't show any "noise component". Is there some
error in my settings for this case?:
<NEKTAR>
<CONDITIONS>
...
<FUNCTION NAME="BodyForce">
<E VAR="u" VALUE="-(Re*Kinvis/H)^2/H" />
<E VAR="v" VALUE="0" />
<E VAR="w" VALUE="0" />
</FUNCTION>
</CONDITIONS>
<FORCING>
<FORCE TYPE="Body">
<BODYFORCE> BodyForce </BODYFORCE>
</FORCE>
<FORCE TYPE="Noise">
<WHITENOISE> 0.5 </WHITENOISE>
<UPDATEFREQ> 10 </UPDATEFREQ>
</FORCE>
</FORCING>
</NEKTAR>
Regards,
*Marc Goldbach*
PhD Student, Department of Mechanical Engineering
University of North Carolina at Charlotte
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Dear all
I want to solve a two-phase flow with Nektar++.
The governing equations lead to
div(viscosity(grad) - factor)u=RHS
that should solve with Helmholtz solver in the velocity correction
scheme.
As the flow is two-phase the viscosity varied across the domain. To
solve the above equation, I set eVarCoeff D00=D11=D22=viscosity, but it
doesn't work.
Would you say how can I set the above equation in helmsolve?
best regards,
Rouhanian
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Hi,
I'm trying to convert a field to some specific points.
I tried to use:
mpirun -np 32 FieldConvert-rg -m
interppoints:fromxml=1cylQ3D_msh2.xml:fromfld=1cylQ3D_msh2.fld:box=400,200,300,-1.0,3.0,-1.0,1.0,0.001,3.0
1cylQ3D_msh2_2059.dat
and i get a "Segmentation fault" as result.
Then I tried as a simple test:
FieldConvert -m
interppoints:fromxml=1cylQ3D_msh2.xml:fromfld=1cylQ3D_msh2.fld:topts=file.csv
file2.dat
The file.csv:
# x, y, z
5.0,-2.0,1.0
7.5,2.0,1.0
8.0,5.0,1.0
And had the same "Segmentation fault" as result.
Before all of that, i was converting my fields to paraview and then
converting to csv files.
I'm spanding to much time. There is a method to generate a csv field direct
from nektar?
Thank you for your support.
Alessandro
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Hi Everyone,
I am a current masters student trying to work on some acoustics.
I was wondering if anyone has any experience with trying to calculate the
acoustic perturbation pressure of a simple stationary cylinder in laminar
flow.
Specifically, I am trying to use the -dp/dt (time derivative of pressure)
from a DNS (direct numerical simulation) of the flow solution for the
laminar flow of the cylinder (Re=200). This term seems quite large up to
200+ in magnitude which perplexes me. I am trying to insert -dp/dt as a
source in the pressure/energy equation.
If anyone has any tips or thoughts please let me know.
Thank you all 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
*******************
This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender.
If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address.
*******************
Dear all,
Receive a warm greeting from Berlin,
I am a PhD student and currently, I am working in elastodynamic models for the study of guided waves propagation. My framework is a semi-analytical method called the Scaled Boundary Finite Element Method.
However, I have been exploring other possibilities and ended up finding Nektar++.
So as you might notice I am new with Nektar, but there is no solver for the equations of elastodynamics. I would like to know if some of you have some experience with this, I'd really appreciate your support.
I thank you in advance!
Looking forward to hearing from you soon!
Regards,
Daniel.
Bundesanstalt für Materialforschung und -prüfung (BAM)
Daniel Hernando Lozano Duarte
8.4 Division/Section (Acoustic and Electromagnetic Methods)
Unter den Eichen 87
12205 Berlin
GERMANY
P: + 49 30 8104-4538
+ 39 3382621636
Daniel-Hernando.Lozano-Duarte(a)bam.de<mailto:Daniel-Hernando.Lozano-Duarte@bam.de>
www.bam.de<http://www.bam.de/>
_______________________________________________________
Die BAM ist eine Bundesoberbehörde im Geschäftsbereich
des Bundesministeriums für Wissenschaft und Energie.