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Hello,
I have simulated the vertical VIV of the bridge deck using the MovingBody
approach, and it worked quite well. My current focus is about simulating
the rotational VIV, so I wonder if the coordinate system transformation
method for rotating bodies (Li et al, 2000) has been implemented in
Nektar++.
Li, L., Sherwin, S.J., Bearman, P.W., 2002. A moving frame of reference
algorithm for fluid/structure interaction of rotating and translating
bodies. International Journal for Numerical Methods in Fluids 38, 187–206.
https://doi.org/10.1002/fld.216
Best wishes,
Yong wang
Ph.D. Student
National Wind Institute
Texas Tech University
Lubbock, TX, United States
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Hi, I am having troubles to install Nektar. I attached what appears in my terminal when I try to compile using -make install- and my configuration in -ccmake ../-
Really hope you can help me, thank you so much!
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Hi, I am currently working on Ubuntu 20.04.21 LTS. Is Nektar 5.0.0. compatible with my Ubuntu version?
If it is not, what should i do to use Nektar?
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Dear Bofu,
Thanks for your email and sorry for the late reply.
I have attached the rbc_DNS.xml and rbc_stability.xml for DNS and the
stability analysis. The stability analysis is performed for Ra=2000,
which should yield growth rate of 1.8775. I have also attached the plot of
the corresponding eigenmode.
Please use Nektar++ 5 (latest version from gitlab). Let me know if you
have any more questions.
With best regards
Abhishek
---------------------------------------------------------------------------------------
Abhishek Kumar
Assistant Professor (Research)
Centre for Fluid and Complex Systems
Coventry University, Coventry CV15FB
The United Kingdom
Phone: +44 24 7765 9150
Mobile: +44 7464026494
---------------------------------------------------------------------------------------
[image: eigen_mode.png]
On Tue, Oct 6, 2020 at 1:26 AM bofu wang <bofuwang86(a)gmail.com> wrote:
> Dear Abhishek,
>
> Thanks a lot for sharing this. Could please provide an example input *.xml
> file for simulation of natural convection? I know how to use nektar++, but
> I haven't tried any thermal convection case yet. By the way, I am very
> interested in your wonderful work published in JFM, I also want to ask
> would it possible to perform stability analysis for thermal convection with
> the nektar5? Thank you again!
>
> All the best!
> Bofu
>
> Abhishek Kumar（通过Google 云端硬盘发送） <abhishek.kir(a)gmail.com> 于2020年10月5日周一
> 下午8:29写道：
>
>> abhishek.kir(a)gmail.xn--com:-794fmz1hrq4e77xg45d
>> nektar++_4p5.zip
>> <https://drive.google.com/file/d/1OkhnVBRn6sJuJ3YvHXoI_PBGHmzwzeC9/view?usp=…>
>> [image: Unknown profile photo]Hi Bofu,
>>
>> Note that now this feature is in the latest version of Nektar5.
>> 打开
>> <https://drive.google.com/file/d/1OkhnVBRn6sJuJ3YvHXoI_PBGHmzwzeC9/view?usp=…>
>> Google云端硬盘：随时随地在任意设备上使用自己的所有文件。
>> Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA [image:
>> Google 云端硬盘的徽标] <http://drive.google.com>
>>
>
--
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Dear all,
I wonder the options of the C0Projection module. Could you please help me with it?
First, the option 'localtoglobalmap' is cheap to perform. However, sometimes it may cause some interpolation problems, leading to a different result compared with the expansive default one. I want to know which
option is better for the precision of results?
Second, since the value of Q-Criterion and vorticity is very high near the wall region, which may cause inconvenience when post-processing, will the option 'usexmlbcs' improve it?
I will be very grateful with your kind reply.
Many thanks,
Zhaoyu Wang
Shanghai Jiao Tong University
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Dear Nektar users,
I found an issue in moving cylinder problem in NEKTAR tests. I want to perform quasi 3D simulations over an oscillating cylinder by using mapping function. However, the velocity in the span direction (w) disappears after around 20,000 time-steps. In fact, the problem becomes full-2D after some time steps!
I've tested various initial conditions for w, such as awgn(1) or awgn(1)*cos(2*PI*z/LZ), etc., and different mapping types, but I could not resolve it.
I would be grateful if you could help me how to resolve this issue. The xml file and a screenshot are attached.
Best regards,
Mahdi
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Dear users,
I have been running simulations of 3D convection in a box with the
incompressible Navier-Stokes solver.
I find that there is always an anomaly at one of the points, where the
pressure field is zero (it is obvious that this zero value is wrong - see
attached image). It might be worth noting that in the image, there are 12
elements with 4 modes per direction each, so 12*4^3 (=768) degrees of
freedom, and the anomalous point seems to be number 767 i.e. the final one,
so perhaps the last pressure variable is not being updated. The session
file used to generate the result shown in the image is attached (takes
about 1min to run on my laptop). Also note it is correct that u, v, w, and
T are zero at the sample point - just not p!
I have found this issue on a variety of cuboidal and also tetrahedral
meshes.
The command to run I used is
mpiexec -np 4 incnavierstokessolver nektar_3d_convection.xml
Can anyone help resolve this?
Many thanks,
Dr Ed Threlfall, UKAEA.
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Dear Nektar++,
I am learning to use Nektar++ and am very interested in the content related to Floquet stability analysis. But I encountered a problem:
I found an example of ‘BiGlobal Floquet analysis of flow past a cylinder’ in section 7.5.12 of user-guide-4.0.0, but I don’t know how to set the BasicFlow function. It says that ’ In order to reconstruct the temporal behaviour of the flow, 32 time slices were considered over one period.’, I don’t know how to implement this operation.
<FUNCTION NAME="BaseFlow">
<F VAR="u,v,p" FILE="cyinder_floq" />
</FUNCTION>
I attempted to find the ‘cylinder_floq’ file mentioned in the above example but failed.
In addition, I find this in 7.4.2 Parameters:
‘N_slices : sets the number of temporal slices for Floquet stability analysis.’
but I don't know how to use it.
In addition, I tried to put several .chk files from basic flow calculations in a folder as snapshots for stability analysis, but it didn't work.
Could you please provide me with this complete example? Or any other useful information will be appreciated.
Looking for some help, please!
Regards,
Xiangjun
x_j_shan(a)outlook.com<mailto:x_j_shan@outlook.com>
发送自 Windows 10 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>应用
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Dear Nektar users,
I tried to run AcousticSolver in parallel, but it doesn't work as expected.
So I looked through the user-guide and found a way to process each parallel
partition in serial , but it seems only to work with ' FieldConvert '.
I just want to run the solver faster through a multi-core computer. Could
anyone give me some suggestions? Thank you!
Best regards,
Guangjian Liu
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Hi,
In this presentation slides obtained from Nektar++ workshop 2015 (attached
below), I see that an absorption forcing function is applied to account for
the negative part of the physiological waveform (Slide 6 of 13). Can
someone provide any insight into how the various parameters involved in the
forcing function are calculated? Also, if there are any available session
files using the forcing function, would it be possible to provide me these
files?
Regards,
*Debshankar Ghosh*
2016A1TS0559P
Mobile- +91-9874097561
Email: Personal <ghoshdeb97(a)gmail.com> || University
<f2016559(a)pilani.bits-pilani.ac.in>
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Birla Institute of Technology and Science, Pilani
Vidya Vihar, Pilani
Rajasthan - 333031, India