You cannot do an accurate (taking the full BDF history) restart if you use CVODE. Stefan ----- Original Message ----- From: [email protected] To: [email protected] 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, [email protected] 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 _______________________________________________ Nek5000-users mailing list [email protected] https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
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