[Nek5000-users] time integration scheme for temperature/scalar equations

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

Hi,
To be more precise. Routines "makeabq" and "makebdq" are called if you 
use hemholtz solver for passive scalars. The other option is cvode, 
which uses slightly different scheme. I guess hemholtz is default and to 
use cvode you have to add CVODE to preprocessing flag. About the link to 
doxygen. This one is outdated so it could be dangerous to use it. There 
is doxygen showing current beta2 version under
https://adampep.github.io/KTH_Framework/files.html
Regards
Adam

On 15/09/17 12:11, nek5000-users at lists.mcs.anl.gov wrote:
>
> Hi Bolun Xu,
>
> Yes,
>
> you can see that in the conduct.f file( in which convection-diffusion 
> equation for temperature is solved): 
> http://www.mcs.anl.gov/research/projects/nek5/docs/html/conduct_8f_source.html
>
> In the subroutine "makeabq"  the same Adam-Bashforth coefficients AB() 
> are called and in the subroutine "makebdq", the BD() coefficients are 
> used again.
>
> best,
> Pierre-Emmanuel
>
>
> On 2017-09-15 11:47, nek5000-users at lists.mcs.anl.gov wrote:
>> Hi! All,
>>
>> I learned from the subroutines makeabf and makebdf in navier1.f that the
>> time integration scheme for momentum equation is the AB-CN scheme, that
>> explicit schemes for nonlinear and forcing term, and implicit ones for
>> viscous term. The prefactors of those schemes are stored in AB() and BD()
>> arrays. Now my question is, whether the temperature/scalar equations also
>> use the same schemes as momentum ones and also share the same prefactors in
>> AB() / BD() arrays.
>>
>> Any help is appreciated.
>>
>> Regards.
>>
>> ----------------------------------------------------------------
>>
>> Bolun Xu
>>
>> University of Science and Technology of China
>>
>> Department of Modern Mechanics
>>
>> Hefei, Anhui, China
>>
>>   
>>
>>
>>
>>
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>
>
>
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