2016년 9월 18일 일요일 오전 10시 57분 16초 UTC-5, JAEKWANG KIM 님의 말:
>
>
> Hello, I am a starter of dealii and am learning a lot these days with the
> help of video lectures and tutorial examples.
>
> I modified step-22 code (stokes flow code) into my own problem, the flow
> around sphere.
>
> and I intend to evaluate the drag force (which is analytically given by
> stokes equation)
>
> My code reached quite close to the value since the absolute error :
> abs(drag_calculated-drag_exact)/drag_exact is around 10^(-3)
>
> However, I expected that if I input higher 'degree' I will receive more
> accurate result, but it didn't
>
> Obviously Q2 is better than Q1. and Q3 is better than Q2. But Q4 or Q4 is
> not better than Q2 or Q3?
>
> Is there any reason on this?
>
> (To be specific, if i say degree 2 , that mean I use (2+1) for velocity,
> (2) for pressure, and (2+2) for Gauss integral....
>
>
> Thank you
>
> Jaekwang Kim
>

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