CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   Order of numerical scheme (http://www.cfd-online.com/Forums/cfx/110490-order-numerical-scheme.html)

j_h_86 December 12, 2012 09:17

Order of numerical scheme
 
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!

ghorrocks December 12, 2012 17:26

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.


All times are GMT -4. The time now is 21:13.