[Nek5000-users] Tripping mechanism

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

Hi Juan Diego,

yes, first you create a random signal in Z with the appropriate spatial 
characteristics (in our case a low-pass filtered signal, but this could 
potentially be created in any other way). So the way you suggest should 
be fine, however, you just need to make sure that you signal does not 
depend on the mesh, i.e. give smaller scales close to element boundaries 
for instance.

Regarding the second point. Essentially you just want to be able to 
restart your simulation. If you use the Lagrange-interpolants p as 
described in our paper, you would need to be able to re-create the same 
two h(z) you had when you stopped the simulation. That's what I meant.

Best regards,
Philipp

On 2018-02-26 17:20, nek5000-users at lists.mcs.anl.gov wrote:
> Dear Philipp,
> 
> 
> Thank you for your response. So if I understand correctly, first you 
> generate a random signal as a function of Z and then use a low-pass 
> filter to obtain h^i(z). Thinking about how to implement this in 
> Nek5000, I guess one could impose random numbers at each node 
> (collocation point) and then apply some kind of filter. Is this correct?
> 
> 
> Also, could you please clarify what you mean by: make sure that you have 
> the same random numbers for the whole spanwise extent? Since h(z) is a 
> function of z, I'm not sure I understand this statement.
> 
> 
> Thank you very much for you help.
> 
> 
> Juan Diego Colmenares
> 
> PhD Candidate
> 
> Department of Mechanical Engineering
> 
> University of New Mexico
> 
> 
> 
> 
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>