[Nek5000-users] Smooth Restart feature in Nek

[nek5000-users at lists.mcs.anl.gov]

You cannot do an accurate (taking the full BDF history) restart if you use CVODE.
Stefan


----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Sent: Tue, 28 Sep 2010 11:19:01 -0600 (GMT-06:00)
Subject: Re: [Nek5000-users] Smooth Restart feature in Nek

Hi Stefan,

yes, the test was done with CVODE.

@ JC
, i have the jump in energy only with a standard restart. The energy 
restarts smoothly
( see e2.eps of the previous email ) if I use the subroutine
"my_full_restart_load" that Paul posted here on 8/11/2010.


Thanks everybody

  francesco




On 09/28/2010 05:21 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Nek's  :-) ,
>
> Francesco, I also encounter this problem and I was on the edge of 
> writing such an email when the mail-list forwarded yours. I work on 
> stenotic flows (non-linear evolution of infinitesimal perturbations), 
> and because of the long-time dynamics we wanna observe, restarting the 
> simulations from previous time steps is not an option.
>
> I set various probes within the flow to plot the velocity. Just like 
> you, I have no problem so far: the velocity restarts smoothly. 
> However, I compute the total energy in usrchk as being the square of 
> the L2-norm and I indeed also get a jump at the restart timestep when 
> plotting this energy.
>
> Help (or at least a few hints on how to solve this) would be highly 
> appreciated.
> Sincerely yours,
>
> JC
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