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Forum: CFX

April 16, 2009, 08:21

Replies: 7

vortex shedding-perturb flow at beginning

Views: 2,128

Posted By ghorrocks

Hi, Yes, a small y-component somewhere...

Hi,

Yes, a small y-component somewhere initially should do it. In the global IC is fine. Using a run as an IC can also work.

Why do you say 1ms is small enough? Unless you have done a...

Forum: CFX

April 13, 2009, 21:29

Replies: 7

vortex shedding-perturb flow at beginning

Views: 2,128

Posted By ghorrocks

Hi, If you are running with a turbulence...

Hi,

If you are running with a turbulence model you may need to kick it to start it off. Maybe give the initial condition a small asymmetry? Also you can start running a laminar flow simulation...

Forum: CFX

April 8, 2009, 18:53

Replies: 7

vortex shedding-perturb flow at beginning

Views: 2,128

Posted By ghorrocks

Hi, In my experience these oscillating flows...

Hi,

In my experience these oscillating flows don't need to be kicked to start up, there is enough numerical noise around to do that by itself.

Are you using second order timestepping? That will...

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