[Nek5000-users] IFCHAR option in rea file

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

Thanks very much Paul.


Sincerely,
NN.


On Monday 06 November 2017 01:30 PM, nek5000-users at lists.mcs.anl.gov wrote:
>
>
> Dear NN,
>
>
> If your flow is turbulent the answer is definitely Yes (they will be 
> different) because of the standard sensitivity to initial condition 
> concerns.
>
>
> Despite this, both schemes are O(dt^k) accurate, meaning  that as 
> dt-->0, the error goes to _zero_ as dt^k, where k=Torder is the 
> prescribed temporal order.   Since the error goes to zero, both will 
> deliver the same answer provided that the physical solution is stable 
> and has an attractor. [Understanding when such conditions prevail is 
> often a challenge.]
>
>
> 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:* Monday, November 6, 2017 6:13:11 AM
> *To:* nek5000-users at lists.mcs.anl.gov
> *Subject:* [Nek5000-users] IFCHAR option in rea file
> Hello,
>
>   I have been using IFCHAR = TRUE in my simulations. The CFL number is
> around
> 1.2 and the computations appear to go on nicely. I would like to know
> if the flow field computed using IFCHAR=TRUE option is different than the
> one obtained with IFCHAR=FALSE (albeit with smaller dt)? If yes, can the
> difference
> be significant?
>
> Many thanks,
> NN
>
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