- Nektar-users - imperial.ac.uk

FieldConvert range option
by Selman BAYSAL 04 Feb '24

04 Feb '24

******************* 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,When I try to run the FieldConvert range option in parallel (e.g., mpirun -np FieldConvert -r x1,x2,y1,y2 turb.xml turb.fld turb.plt) it gives the&nbsp;segmentation fault. This post-process takes a long time in serial run. Is there any point I'm missing? Many thanks in advance.Selman BaysalR. A. in HydraulicsDept. of Civil Eng'gÇanakkale Onsekiz Mart University--ITU Civil Eng., BSc.ITU Coastal Sci. &amp; Eng., MSc.

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Save the date - Nektar++ Workshop 2024
by Mohsen Lahooti 02 Feb '24

02 Feb '24

******************* 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 excited to inform you that the next Nektar++ workshop will be at Newcastle University during 11-13 June 2024 Please save the dates, I will be in touch with more details soon. Cheers, Mohsen Dr Mohsen Lahooti, PhD Lecturer in Fluid-Structure interaction Mechanical Engineering Newcastle University School of Engineering Room 4.28, Stephenson Building Claremont Road Newcastle-Upon-Tyne NE1 7RU United Kingdom Email: mohsen.lahooti(a)newcastle.ac.uk<mailto:mohsen.lahooti@newcastle.ac.uk> Webpage<https://www.ncl.ac.uk/engineering/staff/profile/mohsenlahooti.html>

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FieldConvert: problem in specifying the number of equispaced points
by Nico Clinco 29 Jan '24

29 Jan '24

******************* 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'm trying to use the FieldConvert utility with the option "-n" to specify the number of points for equispaced interpolation in each direction. I have attached in the pic below what happens if i try the command (i receive a bad_alloc error). I think that FieldConvert use the modes specified in the session file to interpolate at a set of equispaced points. I was wondering if it is possible to specify the number of modes and also the types for the interpolation. Thanks in advance. Nicola

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PulseWaveSolver
by 有人即有江湖 22 Jan '24

22 Jan '24

******************* 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， Happy new year！I'm sorry to bother you. I am a new user of nektar++, I'm currently implementing 1D blood flow simulation based on nektar++. I have two questions now. I have some questions about the setting of the ordinate in the geometric parameters of blood vessels in the xml file. The abscissa in the geometric parameters of blood vessels is obviously related to the length of blood vessels. But is the ordinate in the geometric parameters of blood vessels related to some parameters of blood vessels? Or is the ordinate arbitrary? The second question is that there is always negative blood flow velocity in the running result of the xml file I wrote or the xml sample provided by the official. Is this normal? I can only assume at this point that it's due to wave reflections in the blood flow. Kind regards, Shuaifeng

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ReynoldsStresses filter with Scalar Equation
by Daniel Garcia 16 Jan '24

16 Jan '24

******************* 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. ******************* Hello Nektar community, how are you? I'm having some issues with ReynoldsStresses filter when solving inc NS coupled with a scalar equation. In 2D simulation, it runs with the filter, although it outputs RS in the 'z' coordinate (e.g. uw). Also, the average results are somehow different from history points post-processed with the same space sampling and time frequency. As for 3D simulation, the Nektar++ does not run (it crashes) with the error "Level 0 assertion violation. Unsupported dimension". I guess it is confusing the scalar with a spatial dimension. Has anyone already used the RS filter when solving with a scalar equation and know how to workaround this problem? Thank you in advance for your help, Daniel G.

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Compressible Flow Solver: Cannot set the CFL instead of deltaT
by Nico Clinco 12 Dec '23

12 Dec '23

******************* 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 users, I hope that someone can help me. Recently, i'm using the CompressibleFlowSolver by setting the CFL instead of deltaT for running my simulation. However, if i run the simulation with this configuration, it happens that the simulation is completed in only one step and i'm not able to figure out why. I have attached below the screen of my configuration below (SESSION_NEK) and also the output of the simulation. Someone have suggestions? Thank you!

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Homogenous Spanwise Averaging
by Ma, Ting-Hsuan 27 Nov '23

27 Nov '23

******************* 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, I am currently working on obtaining DNS data and have successfully provided Nektar with a 2D mesh (XY) for streamwise and wall-normal directions. Utilizing Nektar's homogeneous expansion in the spanwise direction, I've managed to acquire my 3D turbulence data. However, I'm looking for a function that can return a 2D XY plane of all averaged components by averaging in the spanwise, homogeneous direction. While the Filter "ReynoldsStresses" can provide the 3D time-averaged fields, I was wondering if there's a function specifically designed performing the averaging/output that I have specified. I've checked the user guide without finding relevant information. Any guidance or pointers would be greatly appreciated. Thanks, Dustin

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Buoyancy-Driven Compressible Flow Problem
by 谢亚广 19 Nov '23

19 Nov '23

******************* 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 would like to use the Nektar++ compressible solver for simulating buoyancy-driven flow. So I need to set different temperatures for each wall, but I've noticed that the Twall is defined uniformly for all walls and cannot be set individually for each wall. Is there a way to meet my requirements? I would greatly appreciate any assistance!Kind regardsYaguang Xie

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Jupyter Notebook Tutorials
by Alexander Schukmann 19 Nov '23

19 Nov '23

******************* 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, it seems like it's not possible anymore to run the interactive jupyter notebook tutorials using the cloud resources, as stated on the homepage. Will this issue be resolved in the future? All the best Alex Sicher versendet mit [Proton Mail](https://proton.me/).

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GitLab Account
by Rahul Venkatesh 17 Nov '23

17 Nov '23

******************* 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. ******************* Hello, I have been using Nektar++ for my research. Could you please subscribe me to the GitLab Account. Please find attached the error message i am facing while trying to register as a new user. Thanks and regards *Rahul Venkatesan* PhD Student (Fall 2022) School of Mechatronics Engineering (Mechanics) BIT application number - 20220100159 Student ID - 3820222033 Phone number - 00918220320433

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