[Nek5000-users] Add a forcing term on scalar equation

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

Hi Iman,

There are some minor bookkeeping issues here...

Just to make certain we're on the same page, are you currently
using Pn-Pn-2, or Pn-Pn ?

Paul


On Fri, 20 Jan 2012, nek5000-users at lists.mcs.anl.gov wrote:

> Paul,
>
> Numerically the momentum equation has an explicit forcing term.
> Only that, it is based on the T at the same time. However, I would like to first solve the equation for the scalar.
>
> In other words, I want to first solve the equation for T, use it to calculate f(T) and afterward solve the momentum equation ( u_t=NS + f(T) ). So How I can do that!?
>
>
> Iman
>
>
>
>
>
> ________________________________________
> From: nek5000-users-bounces at lists.mcs.anl.gov [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, January 20, 2012 2:25 PM
> To: nek5000-users at lists.mcs.anl.gov
> Subject: Re: [Nek5000-users] Add a forcing term on scalar equation
>
> Iman,
>
> These can be coupled explicitly, but not implicitly.   Usually, however,
> this is sufficent.  Equation are of the form:
>
>    u_t = NS +  f(u,T)
>
>    T_t = energy eq. + q(u,T)
>
> f & q explicit.   The code will take care of the bookkeeping.
>
> Paul
>
>
> On Fri, 20 Jan 2012, nek5000-users at lists.mcs.anl.gov wrote:
>
>> Thanks.
>> So I just used the "USERQ" to implement the forcing term to scalar filed explicitly.
>>
>> In the next step, I want to coupled the scalar field to Navier-Stokes equation using a forcing term.
>> In this case, the forcing term is a function of scalar field and I would like to implement it implicitly.
>> As far as I know, if I used USERF, the scheme is explicit. So how can I add a forcing term to N-S equation implicitly!?
>>
>> Iman
>>
>>
>>
>> ________________________________________
>> From: nek5000-users-bounces at lists.mcs.anl.gov [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: Thursday, January 19, 2012 4:20 PM
>> To: nek5000-users at lists.mcs.anl.gov
>> Subject: Re: [Nek5000-users] Add a forcing term on scalar equation
>>
>> It's actually evaluated explicitly, so you shold be ok.
>>
>> Paul
>>
>>
>> On Thu, 19 Jan 2012, nek5000-users at lists.mcs.anl.gov wrote:
>>
>>> Hi
>>>
>>> I would like to add a forcing term to the scalar equation.
>>> According to the Nekton manual, Chapter 5, the forcing term is treated implicitly and the convective term is integrated using the third order Adam_Bashforth scheme (AB3).
>>> For my case, the forcing term is a nonlinear function of the scalar field, so I cannot use the implicit scheme and I should lump it with the AB3.
>>> Therefore, could you please guide me and indicate where in the code I can find the implementation of AB3 for the convective term of passive scalar?
>>>
>>> Cheers
>>> Iman
>>>
>>>
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