Hi, 

GaussRadauMAlpha1Beta0 seems to be often used in Tri and Tet with Modified_B. I am not sure if it works with Modified_A(Ideally it should). So, what is your consideration of using GaussRadauMAlpha1Beta0 on the 3rd direction of hex?

Are you using the incompressible Navier-Stokes solver and VCS? Then maybe you should follow chapter 11.1.1.6 to set different number of modes and points for velocity and pressure field.
https://doc.nektar.info/userguide/5.3.0/user-guidese44.html

Hope it helps, or correct me if it's wrong.

Thanks,
Boyang

From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ehsan Asgari <eh.asgari@gmail.com>
Sent: Monday, May 15, 2023 11:53
To: Jacques Xing <jacques.xing@kcl.ac.uk>
Cc: nektar-users <nektar-users@imperial.ac.uk>
Subject: Re: [Nektar-users] potential bug with detailed expansion
 
Hi Jacques

I have a fully hex mesh. My perception is that for hex elements, modified_a should be used.
Please correct me if I'm wrong.

syavash


On Mon, May 15, 2023 at 3:11 PM Jacques Xing <jacques.xing@kcl.ac.uk> wrote:
Hi Ehsan

I believe that you should use Modified_B basis from GaussRadauMAlpha1Beta0 quadrature. I am also assuming that you are using prism elements for the mesh?


Best,
Jacques
From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Ehsan Asgari <eh.asgari@gmail.com>
Sent: Monday, May 15, 2023 9:29 AM
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] potential bug with detailed expansion
 

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Dear All,

When I use a "Modfied" type for expansions everything works fine. But if I specify the expansions in detailed mode:

<E COMPOSITE="C[30011]"
BASISTYPE="Modified_A,Modified_A,Modified_A"
NUMMODES="7,7,7"      POINTSTYPE="GaussLobattoLegendre,GaussLobattoLegendre,GaussRadauMAlpha1Beta0"
NUMPOINTS="8,8,7"
FIELDS="u,v,w" />
<E COMPOSITE="C[30011]"
BASISTYPE="Modified_A,Modified_A,Modified_A"
NUMMODES="6,6,6"
POINTSTYPE="GaussLobattoLegendre,GaussLobattoLegendre,GaussRadauMAlpha1Beta0"
NUMPOINTS="7,7,6"
FIELDS="p" />

Then I get a bunch of errors:

[xxx518:29773] *** Process received signal ***
[xxx518:29773] Signal: Segmentation fault (11)
[xxx518:29773] Signal code: Address not mapped (1)
[xxx518:29773] Failing at address: 0x27b2000
 
I have a fully hex mesh. 
Could you kindly point out if something is wrong with the way I specify the expansions?

Kind regards
syavash