[Nek5000-users] Passive Scalar Initialization

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

Hi,

Thanks for your hint. So, how can I reinitialize the PS after some  
time? Should I call useric at userchk? And as I have two passive  
scalars, how can I make sure that just one of them is initialized and  
the other one and the flow field are read from the restarting fld file?

Thanks again.

Regards,
Alireza





Quoting nek5000-users at lists.mcs.anl.gov:

>
> Hi Alireza,
>
> You can alway reinitialize any field, so either start with or without,
> whichever is easiest.  If it's a long and expensive run (esp. from
> a passive scalar standpoint, for example if you have very low Pr), then
> you might choose to not carry the PS along till you get to your desired
> background flow state.  Otherwise, PS typically costs much less than the
> hydro, so carrying PS along is not an excessive burden and the setup
> and logistics overhead is sometimes easier just to deal with it at
> the outset.
>
> I hope this helps.
>
> Cheers,
>
> Paul
>
>
> On Sun, 15 Jul 2012, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Hi,
>>
>> I want to start solving the passive scalar equation after the  
>> background flow field has reached certain characteristics. Is it  
>> possible to defer the solution of the passive scalar and then  
>> initialize it at sometime t>0? In this case, should I include the  
>> passive scalar boundary condition data in the rea and usr files  
>> from the beginning?
>>
>> Thanks for your help.
>>
>> Regards,
>> Alireza
>>
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