January 2024 - Nektar-users

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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