Hi Syavash,

Thank you for reaching out!

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.
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 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 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