[Nek5000-users] logfile

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

Thanks, Paul,
    Could you please tell me the parameters in terms of ###.par file.
I am using the latest version.

Thank you

On Fri, Mar 30, 2018 at 5:35 PM,  <nek5000-users at lists.mcs.anl.gov> wrote:
>
>
>        1520  Hmholtz TEMP      12   3.8789E-11   4.5120E+07   1.0000E-10
>
>
> On Step 1520, it took 12 iterations to reach a residual of 3.8e-11, starting
> with a residual of 4.5e7, with target residual 1.e-10.
>
>
> [ This is actually too tight of a tolerance, since you are asking for 17
> orders of magnitude reduction in residual and are working only with 16
> significant digits. It seems like you might need to change your .rea file in
> the following way:
>
>
>        set p21 and p22 to 0
>
>
>        set p24, tolrel , to 1.e-3
>
>        set p25, tolabs, to 1.e-3
>
>
> The only time you'll need tolrel/abs tighter than this is if you're doing an
> analytic convergence study where you know the answer to an infinite number
> of digits.   For engineering calculations, 1.e-2 to 1.e-3 is fine.   The
> residual tolerances are set conservatively based on these input values.
>
>
>   1520  Helmh3 fluid      17   3.6594E-11   4.7524E-01   1.0000E-10
>        1520  U-PRES gmres     120   1.3494E-08   4.5675E-06
> 1.0000E-10   7.8799E-01   3.0171E+00
>
>
> You have 17 iterations for the moment equations.
>
>
> You have 120 iterations for pressure.   Again, your tolerances are too tight
> for engineering calculations -- you do not need 1.e-10 for divergence (i.e.,
> for the pressure residual tolerance).
>
>
> hth,
>
> Paul
>
>
> ________________________________
> From: Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of
> nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> Sent: Friday, March 30, 2018 4:52:26 AM
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] logfile
>
> The following is my logfile entry (sample lines). The first line is
> understandable. What do the values in the third and following lines
> denote?
>
>
> ------------------------------------------------------
> Step   1520, t= 7.6000000E-02, DT= 5.0000000E-05, C=  0.072 5.3831E+03
> 3.5403E+00
>              Solving for Hmholtz scalars
>        1520  Hmholtz TEMP      12   3.8789E-11   4.5120E+07   1.0000E-10
>        1520  Scalars done  7.6000E-02  8.3823E-02
>              Solving for fluid
>        1520  Helmh3 fluid      17   3.6594E-11   4.7524E-01   1.0000E-10
>        1520  U-PRES gmres     120   1.3494E-08   4.5675E-06
> 1.0000E-10   7.8799E-01   3.0171E+00
>        1520  Fluid done  7.6000E-02  3.3650E+00
> --------------------------------------------------------
>
> On Fri, Mar 30, 2018 at 3:05 PM,  <nek5000-users at lists.mcs.anl.gov> wrote:
>> I am not sure what you are talking about?
>>
>> -----Original message-----
>>> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
>>> Sent: Friday 30th March 2018 10:30
>>> To: nek5000-users at lists.mcs.anl.gov
>>> Subject: [Nek5000-users] logfile
>>>
>>> Hi Neks,
>>>
>>>      What are the entries in the logfile that is output from running
>>> the code.  Please let me know where the entries are determined in the
>>> code.
>>>
>>> Thanks
>>> Swarandeep
>>> _______________________________________________
>>> Nek5000-users mailing list
>>> Nek5000-users at lists.mcs.anl.gov
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