Thanks again Boyang! 

As I'm working on the simulation of a free jet flow with preceding laminar-turbulent transition within the shear layer of a separation bubble inside a plane channel, would you recommend to use CG or CG-DG (i.e. mixed) implementation of the incompressible Navier-Stokes solver? Re is O(1e3) and Ma << 1. I read that DG projection is necessary if discontinuities are present within the flow field and/or material properties, but it also has other advantages over CG, such as: 
But for CG it is easier to contruct IMEX formulations. So would it be more recommendable to rely on CG-DG instead of CG?

Thank you for your time and patience.
All the best,
Alex


Boyang Xia <boyang.xia@kcl.ac.uk> schrieb am Sonntag, 24. März 2024 um 23:01:
Hi Alexander,

I still need another 2 or 3 months, to get the initial practical solver ready.  To make it perfect takes more time.

Best,
Boyang Xia


From: Alexander Schukmann <alexander.schukmann@protonmail.com>
Sent: Sunday, March 24, 2024 21:54
To: Boyang Xia <boyang.xia@kcl.ac.uk>; s.sherwin@imperial.ac.uk <s.sherwin@imperial.ac.uk>; nektar-users@imperial.ac.uk <nektar-users@imperial.ac.uk>
Subject: Re: [Nektar-users] Incompressible NS solver with DG projection
 
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Hello Spencer and Boyang,

thank you very much for your answers.
@Boyang: will the new version of the ICNS solver come out with the next Nektar++ release, i.e. 5.6.0 or how will it be available?

All the best,
Alex


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-------- Original-Nachricht --------
Am 24. März 2024, 21:40, schrieb Boyang Xia < boyang.xia@kcl.ac.uk>:

Hi both,

Yes, Nektar++ so far does not have a readily available DG incNS solver. 

Theoretically, we can insert the AdvectionWeakDG class, and DisContField::v_HelmSolve() function into existing incNS framework to get a workable DG incNS sover. I tried it but the performance are not satisfying, especially compared with existing CG solver. So I didn't merge that code into master branch.

In fact, I have been working on DG incompressible N-S solver for some time and a brand new version will come out soon.

Many thanks,
Boyang Xia
From: Sherwin, Spencer J <s.sherwin@imperial.ac.uk>
Sent: Sunday, March 24, 2024 16:29
To: Alexander Schukmann <alexander.schukmann@protonmail.com>; nektar-users <nektar-users@imperial.ac.uk>; Boyang Xia <boyang.xia@kcl.ac.uk>
Subject: Re: [Nektar-users] Incompressible NS solver with DG projection
 
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HI Alexander,

 

Not sure if anyone has got back to you. I do not think we have a working DG inc Navier-Stokes yet since using DG does lead to a slightly different polynomial space. However I believe Boyang (cc’ed) has been looking into this.

 

Cheers,

Spencer.

 

 

From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Alexander Schukmann <alexander.schukmann@protonmail.com>
Date: Sunday, 17 March 2024 at 17:04
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] Incompressible NS solver with DG projection

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Hello everyone,

 

I have a quick question regarding the user guide entry for the ICNS solver. The table of possible values for the EqType tag under 11.3.2 in the 5.5.0 user guide does not list "DG" as a projection for the unsteady NS equations (only CG and CG-DG, i.e. mixed projection). However, under 11.3.3 under "Driver" it says DG for the Standard driver. I am a little bit confused as to whether the ICNS solver can be used with DG projection or not and would appreciate some clarification.

 

All the best and thanks a lot!

Alexander

 

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