[Nek5000-users] Problem with the number of itterations

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

For this geometry, I tried the low Re (~10^3), but the number of iterations for the  velx, vely, velz  also did not exceed 1. What do you think? Why do I have the same number of iterations for the low Re?


>Вторник,  4 декабря 2018, 19:55 +07:00 от nek5000-users--- via Nek5000-users <nek5000-users at lists.mcs.anl.gov>:
>
>
>Your problem has very low viscosity, so there will be very few velocity
>iterations.
>
>I would suggest turning off the filter if it's not helping -- but most likely
>there is another issue (e.g., perhaps needing more resolution for the target Reynolds
>number).
>
>For a wing, it might not be a bad idea to first run a 2D airfoil at the target conditions
>just to get an idea of the meshing requirements for the target Re.
>
>hth,
>
>Paul
>
>
>On Tue, Dec 4, 2018 at 6:21 AM nek5000-users--- via Nek5000-users < nek5000-users at lists.mcs.anl.gov > wrote:
>>
>>Hi, Neks!
>>I am working with a complex geometry which was built in gambit.  I have some questions. 
>>1) When I start Nek5000, I have only 1 itteration for velx, vely,velz, but for the preassure field itterations >30. How can  it  be possible? 
>>2) When I set p103=0.1 in .rea file, Courant  number  increases and becomes >1 very fast. How does the filtration effect on the Courant number?
>>I attached my .rea file and  logfile.
>>https://drive.google.com/open?id=1YEV2f5Mllqenhu-rk39YJ84_1XHYjC_H  
>>
>>https://drive.google.com/open?id=1jRKI_zEnb78cR7uXFi3mE0txk6FN3EXQ  
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