[Nek5000-users] Boundary nodes cordinates and random generator

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

Hello Philip,

The turbulent velocity field is generated by random Fourier modes. So, yes I have to generate 150 random numbers for 4 different variables(Angles) at each time step. Or do you have any other simple way to suggest to make it computationally cheaper?

Thanks

Sijo

----- Mail original -----
De: "nek5000-users" <nek5000-users at lists.mcs.anl.gov>
À: "nek5000-users" <nek5000-users at lists.mcs.anl.gov>
Envoyé: Mardi 16 Octobre 2018 16:38:12
Objet: Re: [Nek5000-users] Boundary nodes cordinates and random generator

Hi, how would your inflow turbulence model work? Do you need to create 
150 random numbers every time step?

Philipp

On 2018-10-16 16:01, nek5000-users at lists.mcs.anl.gov wrote:
> Hello Neks,
> 
> Its been a long time that I posted something in NEK5000. Here I came up 
> with something which is simple.
> First thing is, I was trying to access the co ordinates of the inlet 
> boundary elements for my free stream turbulence model(Von karman).
> 
> I have an idea to get the using cbc(f,e,1) but I just would like to know 
> is there any quick way to get the inlet bounday nodes coordinate.
> 
> Second thing is about the making of random numbers.
> I know that in fortran there is an inbuilt function to generate random 
> numbers (call random_generator(iseed)) but it seems it is an expensive 
> process since my number of modes of turbulence model is 150.
> 
> So just I have a question that how you usually generate random numbers 
> when you model free stream turbulence?
> 
> By the way I have completed the FSI calculation of NACA0012 at Re 64000 
> in NEK5000. Thanks for your help.
> 
> Regards
> 
> Sijo GEORGE
> 
> 
> 
> 
> 
> 
> 
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