Comparing smooth and rough walls

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asda9786
Posts: 7
Joined: Mon Apr 01, 2019 12:00 pm

Comparing smooth and rough walls

Post by asda9786 » Mon Apr 01, 2019 12:05 pm

Hello fellow Code_Saturne users.
I am running a steady state simulation with rough walls and would like to compare it to smooth walls. For my rough walls, I believe i Have met convergence despite what seems to look like a noisy signal. Is there any way to alleviate the noise, maybe by constructing some sort of mean field. Or would maybe running a unsteady simulation be better?
I have attached the velocity field below.
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Screenshot from 2019-04-01 08-05-15.png

Luciano Garelli
Posts: 215
Joined: Fri Dec 04, 2015 1:42 pm

Re: Comparing smooth and rough walls

Post by Luciano Garelli » Mon Apr 01, 2019 3:30 pm

Hello,

I think that you can use an octave or python script to calculate an average value after convergence is reached.

Best Regards,

Luciano

asda9786
Posts: 7
Joined: Mon Apr 01, 2019 12:00 pm

Re: Comparing smooth and rough walls

Post by asda9786 » Mon Apr 01, 2019 5:28 pm

Thank you for the reply Luciano. I am currently trying to see if I can get an average value through the software 'paraview'.
If this isn't possible I will try another method. :D

Yvan Fournier
Posts: 2678
Joined: Mon Feb 20, 2012 3:25 pm

Re: Comparing smooth and rough walls

Post by Yvan Fournier » Mon Apr 01, 2019 7:32 pm

Hello,

You can also construct a mean field using time averages in Code_Saturne.

You can activate those directly from the GUI.

Regards,

Yvan

Luciano Garelli
Posts: 215
Joined: Fri Dec 04, 2015 1:42 pm

Re: Comparing smooth and rough walls

Post by Luciano Garelli » Mon Apr 01, 2019 8:51 pm

Hello,

In paraview you can apply the "Temporal Statistics" filter. it will compute the average, the max and min values or use the time averages in Code_Saturne as Yvan mention.

Best Regards,

Luciano

asda9786
Posts: 7
Joined: Mon Apr 01, 2019 12:00 pm

Re: Comparing smooth and rough walls

Post by asda9786 » Thu Apr 04, 2019 10:17 am

Thank you for the response I will try these techniques out in Code_Saturne and Paraview respectively.

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