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Forum: CFX

October 20, 2011, 07:20

Replies: 8

Is this convergence real?

Views: 2,257

Posted By ghorrocks

As ever, the best way to determine this is with a...

As ever, the best way to determine this is with a sensitivity analysis. Choose an output parameter of interest to your simulation (pressure loss, heat loss, whatever but preferably something which is...

Forum: CFX

October 20, 2011, 06:54

Replies: 8

Is this convergence real?

Views: 2,257

Posted By ghorrocks

I see. In that case I suspect you just about got...

I see. In that case I suspect you just about got to the ultimate accuracy of your computer and simulation at 500 iterations, and are definitely there at 1000 iterations. The stuff beyond that is just...

Forum: CFX

October 20, 2011, 06:31

Replies: 8

Is this convergence real?

Views: 2,257

Posted By ghorrocks

Probably a numerical round off thing. It is...

Probably a numerical round off thing. It is unusual that it reduces the residual, it normally increases it. Try using double precision numerics and see if the same thing happens.

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