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October 19, 2005, 00:42 |
CDS a thought
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#1 |
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Posts: n/a
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There have been lot of discussion about CDS being unstable due to the reason that it can give unphysical oscilation in solution. I was wondering whether this is the reason for it:
when we descretise the equations we get (ap_conv + ap_diff) phi_p = sum(a_i * phi_neigh) + SU now if (ap_conv + ap_diff) ~ 0 we get very high values of phi_p if we are solving by gauss seidel etc. that is we can not write the equation as : phi_p = ( sum(a_i * phi_neigh) + SU) / (ap_conv + ap_diff) as needed by Gauss Seidel. Is this the reason for unstablity. Could someone comment on it. |
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