Hi,

I have been trying to simulate the Turbulent Channel flow test case as well using the same session file. What I found was transition takes a bit of time to kick in, so it's better to use a higher time step and keep storing files every 5-10 time units, as has been suggested in a previous thread. I do have a few doubts queries I would like to post to the community though:

1. The turbulent flow that results from my simulations is pretty unstable and keeps diverging frequently. I have used "DEALISING" to stabilize the flow, but it's not much help. I understand that I can use SVV parameters to stabilize the flow, but is there any workaround for this? Also, how do I know what SVV parameters to use?
2. Can I use a higher noise value to kickstart the transition process faster?
3.Are there any filters I can use to calculate the turbulent kinetic energy budgets?

Regards,
Debshankar Ghosh
Graduate Student
Faculty of Applied Science | School of Engineering
The University of British Columbia | Okanagan Campus
EME 1240 3333 University Way | Kelowna British Columbia | V1V 1V7 Canada


On Thu, Feb 4, 2021 at 8:50 PM Eli Frydman <elimanu123@gmail.com> wrote:

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Hi all,

I tried to run the turbulent channel flow test case from the user guide (session file TurbChFl_3DH1D.xml) but i didn't get any turbulent flow. I used a body force in the u direction as explained and added also a perturbation in the spanwise direction and didn't get any transition.

Regards, 
Eli
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