[Nek5000-users] previous value of drag coefficient

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

Thank you Philip. I am sorry I just started to use NEK5000 and in Fortran too. I could not find an example of the concept of lag array. I know its a silly question. But could you please help me how to initialize such an array.

Thanks again
Sijo GEORGE

----- Mail original -----
De: "nek5000-users" <nek5000-users at lists.mcs.anl.gov>
À: "nek5000-users" <nek5000-users at lists.mcs.anl.gov>
Envoyé: Mercredi 22 Novembre 2017 11:05:45
Objet: Re: [Nek5000-users] previous value of drag coefficient

Hi,
I suggest to use lag arrays as done for the BDF scheme, that is to have an array of size #multisteps and at each new time step to copy the old RHS (as you do AB) one step backwards.
This is then somewhat consistent with Nek. Just be careful during the startup.
Hth, Philipp

On November 22, 2017 10:31:11 AM GMT+01:00, nek5000-users at lists.mcs.anl.gov wrote:
>Hi Neks, 
>
>Since I am trying to implement Adams bashforth scheme on my FSI problem
>(for equation of motion), I would like to pass the lift coefficients of
>the current timestep and the just previous time step to the function
>where I implemented the Adams Bashforth module. But its seems a bit
>difficult to fetch the just previous value of dragy value since it
>calls a new value at every time step. I simply tried a swapping method.
>But it gets zero value. Could you please tell me whether is there any
>way to fetch the just previous value of a variable (from an array or
>something?) 
>
>
>Thanks regards 
>
>Sijo GEORGE 

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