Hi Syavash, The first one is a rather definitive no. I simply delete the files as I go. The second one, IMHO is very well explained in Alessandro Bolis thesis I am attaching here, I got it from the Nektar++ page anyway. See section 2.1.3.3, page 50-52 of the thesis. Cheers, Stan Best regards, Stanisław Gepner, Ph.D. *Faculty of Power and Aeronautical Engineering* Nowowiejska 21/25 Str. 00-665 Warsaw, Poland phone +48 (22) 234 51 70 <https://www.pw.edu.pl/engpw> On 7.03.2023 15:39, Ehsan Asgari wrote:

This email from eh.asgari@gmail.com 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 had two questions:

1-Is it possible to specify the output field overwrite using a parameter? For example, keeping only the last two time fields. I searched through the user-guide but couldn't find it.

2-What is the difference between "MODIFIED" and "GLL_LAGRANGE" under TYPE in the incompressible solver?

I appreciate your kind responses.

syavash

_______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/nektar-users

Hi Syavash, Thank you for reaching out! 1. At the moment it is not possible to over-write the output fields that already written. However, it is intended to add this functionality in future versions. 2. Very Briefly: “MODIFIED” corresponds to modified Legendre polynomials (modal basis functions), while “GLL_LAGRANGE” corresponds to Lagrange polynomials (nodal basis functions) to approximate the pressure and the velocity fields that you are solving for. Each of these has a different formulation and implementation inside nektar++. If you are interested in knowing more about their implementation, you can look in chapter 2 of this book: https://academic.oup.com/book/7538 Kind regards, Alexandra From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> On Behalf Of Ehsan Asgari Sent: 07 March 2023 14:39 To: Nektar-users@imperial.ac.uk Subject: [Nektar-users] (no subject) This email from <mailto:eh.asgari@gmail.com> eh.asgari@gmail.com 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 <https://spam.ic.ac.uk/SpamConsole/Senders.aspx> safe senders list to disable email stamping for this address. Hi Everyone, I had two questions: 1-Is it possible to specify the output field overwrite using a parameter? For example, keeping only the last two time fields. I searched through the user-guide but couldn't find it. 2-What is the difference between "MODIFIED" and "GLL_LAGRANGE" under TYPE in the incompressible solver? I appreciate your kind responses. syavash