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-   -   Alternating plus and minus signs in the results (http://www.cfd-online.com/Forums/main/114926-alternating-plus-minus-signs-results.html)

jollage March 20, 2013 04:25

Alternating plus and minus signs in the results
 
Hi All,

This is maybe too general a question.

My results showed in the attachment is the derivatives of the flow field, row is the x direction and column y direction.
You see there are the signs alternating every grid point in the y direction. I used compact scheme to calculate the derivative.

I want to ask what could be the reason for this kind of outcome. I know that dispersion error could generate some alternating signs along the y=0 line, for example.

Thanks,
Jo


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