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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