Hi Spencer,

This is a very simple 2 dimesnional mesh with no curved elements. So I do not think this is a meshing issue. In fact changing the outflow Robin BCs to  a more conventional Nuemann form for velocity immediately allows the solution to run smoothly.

Sincerely,

On Wed, Feb 27, 2019 at 3:26 AM Amitvikram Dutta <amitvikram.dutta@uwaterloo.ca> wrote:
 
From: nektar-users-bounces@imperial.ac.ukOn Behalf OfSherwin, Spencer J
Sent: February 27, 2019 3:25:43 AM (UTC-05:00) Eastern Time (US & Canada)
To: Amitvikram Dutta
Cc: nektar-users
Subject: Re: [Nektar-users] Error in apply Dong outflow BCs

Hi Amitvikram,

What sort of mesh were you running? Perhaps this is a 3D element we have not fully tested ?

Cheers,
Spencer 

Sent from my iPhone

On 27 Feb 2019, at 07:09, Amitvikram Dutta <amitvdutta23@gmail.com> wrote:

Hi all,

I'm testing out the Robin type BCs for the outflow as given in the user guide.
Which takes the form of the following


 <R VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep"/>
 <R VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="D0/TimeStep"/>
 <R VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="0" PRIMCOEFF="1.0/(D0*Kinvis)"/>

Upon startup, this gives the error

Fatal   : Level 0 assertion violation
Could not identify matrix type from dimension

I havent come across this error before. Could someone point out what the error is?
SIncerely,
--

Amitvikram Dutta

Graduate Research Assistant

Fluid Mechanics Research Lab

Multi-Physics Interaction Lab

University of Waterloo

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--

Amitvikram Dutta

Graduate Research Assistant

Fluid Mechanics Research Lab

Multi-Physics Interaction Lab

University of Waterloo