[Nektar-users] how to use HOBC?

[Kurt Sansom]

if the forcing is applied in the velocity component what does that mean in
terms of how the solver works?
 does that mean that the forcing term is only applied in solving the
Helmholtz  part or  is it applied in both the pressure poisson and
the Helmoholtz solve?

Regards,
 ~Kurt

On Tue, Jul 25, 2017 at 3:40 PM, Sherwin, Spencer J <
s.sherwin at imperial.ac.uk> wrote:

> Hi Kurt,
>
> In the high order outflow condition the pressure appears as p n (where n
> is the normal) and has to be introduced in the relevant velocity component.
> So if your outflow is normal to the x-direction then the value of p n
> should appear in the Value of the u-variable.
>
> Cheers,
> Spencer.
>
> On 24 Jul 2017, at 22:55, Kurt Sansom <kayarre at gmail.com> wrote:
>
> Hi,
>    I am trying to use the higher order outlet boundary conditions. I know
> that is formulated for truncated open domains, but am curious if I can use
> in the following way, where I want to specify the outlet pressure to some
> value to create back pressure in  the system. I realize that for
> in-compressible flow it doesn't matter that much, but I am interested in
> implementing a time varying pressure condition at the outlet.
>
>  I have tried the following boundary condition for a tube and it doesn't
> appear to apply the VALUE tag? I want to make sure before I file a bug.
>
> <REGION REF="2">
>     <!-- Outlet , N=Neumann=gradient, D=Dierchlet=value R=Robin=mixed-->
>     <N VAR="u" USERDEFINEDTYPE="HOutflow" VALUE="0" />
>     <N VAR="v" USERDEFINEDTYPE="HOutflow" VALUE="0" />
>     <N VAR="w" USERDEFINEDTYPE="HOutflow" VALUE="0" />
>     <D VAR="p" USERDEFINEDTYPE="HOutflow" VALUE="10665" /></REGION>
>
>
> Regards,
>  ~Kurt
>
> --
> Kurt Sansom
> _______________________________________________
> Nektar-users mailing list
> Nektar-users at imperial.ac.uk
> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users
>
>
> Spencer  Sherwin
> McLaren Racing/Royal Academy of Engineering Research Chair,
> Professor of Computational Fluid Mechanics,
> Department of Aeronautics,
> Imperial College London
> South Kensington Campus
> London SW7 2AZ
>
> s.sherwin at imperial.ac.uk
> +44 (0) 20 759 45052
>
>


-- 
Kurt Sansom
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