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Showing results 1 to 11 of 11 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX June 25, 2014, 07:55

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks Yes, physical instability will result in... Yes, physical instability will result in numerical instability as well. So if the flow is truly transient then a steady state run will be unstable. This is all explained in the FAQ this thread has...

Forum: CFX June 25, 2014, 07:45

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks Your simulation is clearly very numerically... Your simulation is clearly very numerically unstable. Local time stepping is not helping you much - so do not use it. Physical time stepping will probably work better for you. That is why all...

Forum: CFX August 7, 2013, 18:31

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks When you set the simulation up, in the CFX-Pre... When you set the simulation up, in the CFX-Pre output tab add the equation residuals to the results file. Then the residuals will be part of the output file and you can use standard post-processing...

Forum: CFX March 22, 2011, 06:48

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks The CFX documentation describes how to speed... The CFX documentation describes how to speed things up. This link may also be of assistance....

Forum: CFX March 21, 2011, 19:10

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks Yes. Local time scale really only needs to... Yes. Local time scale really only needs to be used for difficult problems. Most problems should be OK with physical time scale.

Forum: CFX March 10, 2011, 19:24

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks Improving mesh quality is usually the biggest... Improving mesh quality is usually the biggest difference.

Forum: CFX March 10, 2011, 06:25

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks Converged - almost certainly, but you should do a... Converged - almost certainly, but you should do a sensitivity check to be sure. You are probably converging tighter than you need. Correct - Cannot say. There are many checks you need to do beyond...

Forum: CFX March 7, 2011, 18:45

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks "time scale should be not larger than the... "time scale should be not larger than the advection time scale value" - where did you see that? I cannot find this comment, and it is incorrect in my opinion. The time scale SHOULD be larger than the...

Forum: CFX March 6, 2011, 17:07

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks The FAQ is written as a step by step guide as how... The FAQ is written as a step by step guide as how to address the non-convergence. It discusses adjusting the timestep later on: [/LIST]

Forum: CFX March 3, 2011, 17:46

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks This is all discussed in the page I linked to. This is all discussed in the page I linked to.

Forum: CFX March 2, 2011, 16:39

Replies: 23 When to use local timescale or physical timescale Views: 26,311 Posted By ghorrocks This FAQ explains timescale selection and when to... This FAQ explains timescale selection and when to use local timescale factor: ...

Showing results 1 to 11 of 11

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