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December 12, 2012, 08:17 |
Order of numerical scheme
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#1 |
Member
Johannes Ringborn
Join Date: Nov 2012
Posts: 40
Rep Power: 13 |
Hello,
I did a 2nd order calculation of a laminar flow in CFX which followed a GCI study (refinement factor r=2, 3 grids, asymptotic range (1.001113)). I observed a rate of convergence of p=1.15. I expected a value a bit less than 2 due to numerical effects but can a value close to 1 still be correct? Thank you very much in advance! |
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December 12, 2012, 16:26 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
Yes. All the different bits of the equations can converge at different rates - advection could be second order, bit diffusion could be first, etc etc. So if I find I am in the asymptotic range p which is close then I am happy.
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