[Nek5000-users] Smooth Restart feature in Nek

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

Is this with CVODE?

-Stefan


----- Original Message -----
From: nek5000-users at lists.mcs.anl.gov
To: nek5000-users at lists.mcs.anl.gov
Sent: Fri, 24 Sep 2010 09:53:35 -0600 (GMT-06:00)
Subject: Re: [Nek5000-users] Smooth Restart feature in Nek

Hi all.

First, i have a comment that may save some time to some users.
If i am  correct, in Paul's comments rstx.fld03 and rstx.fld04 are the 
two fields after the x.fld92. Thus if x.fld92 is the field at time step 
NT=9200 , rstx.fld03 and rstx.fld04  are at NT=9201 and NT=9202.

This means that if you want to restart a simulation from NT=10000, you 
need to run it at least until NT=10002 ( using Torder=3).
Is that correct?

Second, i have a problem. I think I am able to restart the velocity 
smoothly, but i may have a problem with the temperature.
Attached there are two figures of the  perturbation energy 
(e2=<vx^2+vy^2>) and the temperature root mean square during the restart 
of  an heated turbulent channel. The full restart clearly improves  e2, 
while the temperature has the same behavior of the standard restart. Am 
I misled  by the plots? Do i have to do anything particular for the 
restart of the scalars? Did anybody else have the same issue?

Thank you for any help.
francesco




On 08/11/2010 03:03 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Shriram,
>
> Attached is a full-restart routine.   You need to update the repo
> to use it.  It seems to work ok - hopefully the remarks in the attached
> .usr file are clear.
>
> Paul
>
> On Mon, 9 Aug 2010, nek5000-users at lists.mcs.anl.gov wrote:
>
>    
>> Hi Paul,
>>
>> Thanks a lot. That would be very helpful.
>>
>> Regards
>> Shriram
>>
>>