March 2025 - Nektar-users - imperial.ac.uk

Nektar++ Workshop 2025
by Chris Cantwell 21 May '25

21 May '25

Dear all, This year's Nektar++ Workshop will be held on the 24th-26th June 2025 at Imperial College London. We are pleased to announce that Tzanio Kolev (leader of the MFEM project) has agreed to give a keynote lecture at the workshop. More information will be made available via the website soon, including how to register. As with recent years, the event is primarily an in-person meeting, but we will aim to allow the talks to be viewed remotely for those unable to travel. Kind regards, Chris -- Chris Cantwell Reader in Computational Engineering Director of Postgraduate Studies (PhD) 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

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Value of δ in HOutflow condition
by Isaac Rosin 31 Mar '25

31 Mar '25

******************* 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, I am using the HOutflow condition at the outlet of my flow domain with the incompressible Navier-Stokes solver. According to the user guide, this is enforcing a boundary condition defined by Dong, Karniadakis and Chryssostomidis in equation 3 of their paper: A robust and accurate outflow boundary condition for incompressible flow simulations on severely-truncated unbounded domains. This boundary condition is also stated in equations 11.27 and 11.28 of the user guide. Both the paper and the user guide state that δ is "chosen to be sufficiently small" without explaining what constitutes sufficiently small. Would anyone happen to know what value of δ is used by Nektar++ or where I could find it? Kind regards, Isaac

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nektar for dynamic stall simulations
by Lars Wein 31 Mar '25

31 Mar '25

Dear Nektar-Team, last week during the ETC conference in Hannover, I listend to Mr. Spencer. I think he mentioned you are currently working on a methodology to simulate moving bodies. In my team, we are simulating dynamic stall on wind energy turbines, using openFOAM and a sliding mesh interface. The blade performs an oscillating pitching motion, defined by the user (not two-way FSI). Since we strive for hybrid RANS LES, or even wall resolved LES, I would prefer to switch from openFOAM to a solver that supports higher order numerical methods. Do you think Nektar would be feasible for this kind of simulations? Best regards Lars Wein -- Dr.-Ing. Lars WEIN <https://www.tfd.uni-hannover.de/de/institut/unser-team>Team Leader Multiphysics of Turbulent Flows & Deputy COO Logo LUH / TFD Gottfried Wilhelm Leibniz Universität Hannover Institute of Turbomachinery and Fluid Dynamics | TFD An der Universität 1 Geb. 8140, Raum 209 30823 Garbsen, Germany Telefon: +49 (0)511 762 2347 Fax: +49 (0)511 762 3997 E-Mail: wein(a)tfd.uni-hannover.de Web: www.tfd.uni-hannover.de <http://www.tfd.uni-hannover.de>

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Time derivatives
by Guillermo Suárez 16 Mar '25

16 Mar '25

******************* 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, Is there a way to write the time derivatives of velocity and pressure to a file, possibly using FieldConvert? I am specifically interested in the incompressible solver. Thank you. Cheers, Guillermo

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pipe flow tutorial
by 秦志文 03 Mar '25

03 Mar '25

******************* 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 using naktar++ 5.3.0 for research and have seen the example of 'turbulent pipe flow' in the user guide, but I cannot find it in the installation package. Could you please provide it. regards ZhiWen Qin

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