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Forum: CFX

March 16, 2010, 06:09

Replies: 7

Machine round-off precision

Views: 2,352

Posted By ghorrocks

No, I think I correctly understood your...

No, I think I correctly understood your terminology - I think you misunderstood my last point.

My point was that the error due to the mesh size (ie truncation due to mesh size) is going to be far...

Forum: CFX

March 15, 2010, 14:17

Replies: 7

Machine round-off precision

Views: 2,352

Posted By ghorrocks

The truncation error due to mesh resolution...

The truncation error due to mesh resolution should be orders of magnitude higher than the error due to round off. I can't see why you would bother going to machine round off error. Convergence to a...

Forum: CFX

March 14, 2010, 17:48

Replies: 7

Machine round-off precision

Views: 2,352

Posted By ghorrocks

Why can't you just say a maximum of X iterations...

Why can't you just say a maximum of X iterations where X is larger than would ever be required? Or a convergence tolerance tight enough that it is pretty close to machine round off?

Why do you...

Forum: CFX

March 11, 2010, 23:39

Replies: 7

Machine round-off precision

Views: 2,352

Posted By ghorrocks

Difficult? Try setting the residual target to...

Difficult? Try setting the residual target to 1e-20 and see what happens. Machine round off will stop you getting anywhere near the value.

But if you are asking how do you get it to stop when it...

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