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Forum: CFX

August 30, 2011, 06:51

Replies: 8

Adaptive Timesteps

Views: 2,428

Posted By ghorrocks

Excellent. That sounds much more promising.

Excellent. That sounds much more promising.

Forum: CFX

August 26, 2011, 22:07

Replies: 8

Adaptive Timesteps

Views: 2,428

Posted By ghorrocks

Your convergence target is almost certainly far...

Your convergence target is almost certainly far too tight. Do a residual sensitivity study so you know how tight you need to go - 1e-3 or 1e-4 is more normal for transient flows.

Forum: CFX

August 26, 2011, 07:05

Replies: 8

Adaptive Timesteps

Views: 2,428

Posted By ghorrocks

Remove the max and min number of coeff loops in...

Remove the max and min number of coeff loops in the convergence control section. This is forcing it to do either 3 or 4 loops per time step and that means your min3 max5 adaptive timestep critereon...

Forum: CFX

July 23, 2011, 06:19

Replies: 8

Adaptive Timesteps

Views: 2,428

Posted By ghorrocks

Set the initial timestep to be small, in general....

Set the initial timestep to be small, in general. I don't generally use max/min timesteps but set a simulation time instead. The default increase/decrease factor should be fine.

As described in...

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