Dear Mahdi,

Thank you for your email. Could please give us a bit more info regarding the actual problem?
I.e. setup file and what sort of geometry you are using.

Thanks,

Guglielmo
From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Mahdi Erfanian Nakhchi <mahdi.nakhchi@northumbria.ac.uk>
Sent: 19 November 2022 12:46
To: nektar-users <nektar-users@imperial.ac.uk>
Subject: [Nektar-users] Constant CFL number
 

This email from mahdi.nakhchi@northumbria.ac.uk originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list to disable email stamping for this address.

 

Dear Nektar users,

I am running some 3D incompressible simulations. The problem I faced is that the software gives me identical CFL numbers for all time steps. Also, the simulation results do not change with time, which is not correct. The flow is turbulent and the Reynolds number is 10000.

Steps: 20       Time: 2e-06        CPU Time: 8.2572s
CFL: 0.338963 (in elmt 105130)
Steps: 30       Time: 3e-06        CPU Time: 7.98256s
CFL: 0.338963 (in elmt 105130)
Steps: 40       Time: 4e-06        CPU Time: 7.94238s
CFL: 0.338963 (in elmt 105130)
Steps: 50       Time: 5e-06        CPU Time: 7.99028s
CFL: 0.338963 (in elmt 105130)
Steps: 60       Time: 6e-06        CPU Time: 8.02182s
CFL: 0.338963 (in elmt 105130)
Steps: 70       Time: 7e-06        CPU Time: 8.03556s


Have you ever faced this issue? and any solutions for that? Many thanks.

Best regards
Mahdi
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