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Search took 0.00 seconds. Search: Posts Made By: Davide_sd
Forum: FLUENT August 24, 2013, 05:57
Replies: 22
Views: 13,566
Posted By Davide_sd
Thank you very much for these settings!!! :) ...

Thank you very much for these settings!!! :)
Can i ask you the settings you have used for the residuals?
I have set them up to 1e-10 and with k-epsilon model the simulation converges in 2300...
Forum: FLUENT August 22, 2013, 15:38
Replies: 22
Views: 13,566
Posted By Davide_sd
Bulk velocity = 0.045920161602589 [m/s] ...

Bulk velocity = 0.045920161602589 [m/s]

according to the paper:
Boundary layer thickness d = 100 [mm]
External velocity ud = 0.0482 [m/s]
Reynolds number Rd = 4,772
Friction velocity u* =...
Forum: FLUENT August 21, 2013, 16:38
Replies: 22
Views: 13,566
Posted By Davide_sd
I have to make a correction to my previus post: ...

I have to make a correction to my previus post:
The result of the simulation with periodic boundary condition is shown in this image: Link 1 (https://www.dropbox.com/s/569nrk678a9soid/grafici-2.jpg)...
Forum: FLUENT August 20, 2013, 12:19
Replies: 22
Views: 13,566
Posted By Davide_sd
I have done some tests: k-epsilon (standard...

I have done some tests:
k-epsilon (standard wall function, enhanced wall treatment), k-omega, SST aren't able to converge.
Reynolds Stress with enhanced wall treatment is not able to converge....
Forum: FLUENT August 16, 2013, 04:53
Replies: 22
Views: 13,566
Posted By Davide_sd
Seems like i'm having trouble to setup the...

Seems like i'm having trouble to setup the periodic conditions.
I've been following fluent guide (http://aerojet.engr.ucdavis.edu/fluenthelp/html/ug/node194.htm): mesh/modify-zones/make-periodic

...
Forum: FLUENT August 11, 2013, 15:05
Replies: 22
Views: 13,566
Posted By Davide_sd
Alex, thank you for your response! I have to...

Alex, thank you for your response!

I have to take a look at Reynold Stress Model!

In the meantime, i have extracted all the reynolds profiles from the paper.
Just to be sure, i want to ask...
Forum: FLUENT August 10, 2013, 18:39
Replies: 22
Views: 13,566
Posted By Davide_sd
Can you explain it better, please? ...

Can you explain it better, please?




I've tryed to decrease the dissipation (as low as 1e-10) and i've noticed:


k-epsilon with enhanced wall treatment: no changes at all;
k-epsilon...
Forum: FLUENT August 10, 2013, 15:47
Replies: 22
Views: 13,566
Posted By Davide_sd
for the turbulent dissipation rate, i'm using the...

for the turbulent dissipation rate, i'm using the default value of 1m^2/s^3; the paper doesn't provide a dissipation profile.

What value should i try?
Forum: FLUENT August 10, 2013, 13:19
Replies: 22
Views: 13,566
Posted By Davide_sd
all the data used in the simulation are taken...

all the data used in the simulation are taken from the paper, and i'm pretty sure to have them extracted correctly.

i know k-epsilon is not the best choice for low Reynolds number. Still i'm using...
Forum: FLUENT August 10, 2013, 06:44
Replies: 22
Views: 13,566
Posted By Davide_sd
k-epsilon with enhanced wall treatment, because...

k-epsilon with enhanced wall treatment, because y+ < 1 (in this case it starts at 0.9 at inlet, and drop to 0.4 at outlet).
Forum: FLUENT August 10, 2013, 05:12
Replies: 22
Views: 13,566
Posted By Davide_sd
Problem with Turbulence Kinetic Energy

Hi all,

i've setup a very simple simulation: a flat terrain, with a given inlet velocity and turbulence kinetic energy profile (find it on a paper). To create these profiles, i've setup a UDF....
Showing results 1 to 11 of 11

 
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