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Old   December 29, 2005, 00:07
Default results with parallel processing
Muhammad Shakaib
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I am solving an unsteady problem using linux cluster at six nodes. For comparison I started the solution (first few iterations)using the cluster and then started the solution using single computer. There was some difference in the printed residual values. Is this usual or something wrong has happened. I am using fluent 6.2.16.


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Old   December 29, 2005, 01:56
Default Re: results with parallel processing
Hubert Janocha
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It is possible that the residuals vary a little bit. When using domain decomposition you will introduce (in some way) an other iterative process, because the boundaries on the domain borders are only virtually, and are not fix. They will be updated e.g. each Iteration. So you have a weak disatvantage in convergence rate/behauviour in parallel mode. But this disatvantage is very small, it depends strongly on the solver settings, and implementation for parallel mode.

Because of this I would be suprised when you get the same residuals.
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