[Nek5000-users] Smooth Restart feature in Nek

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

thank you
francesco



On 09/28/2010 07:43 PM, nek5000-users at lists.mcs.anl.gov wrote:
> 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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