Shape function of P1isoP2/P2 triangle element
Dear All.
Could you recomend me a source (book or article) with detail of the shape function of P1isoP2/P2 triangle element that used in N3S software. Thanks 
Re: Shape function of P1isoP2/P1 triangle element
Dear All,
Sorry, that should be P1isoP2/P1 triangle element Thanks 
Re: Shape function of P1isoP2/P1 triangle element
The report on N3S code is a good reference:
Chabard J.P., Projet N3S de mecanique des fluides, manuel theorique  version 2.0. HE41/88.09. 1989 EDF. But these shape functions can be described very easily (from Burnett): On each triangle, The shape functions for P1 approximation are the following: uj(x,y)=(aj+bj*x+cj*y)/2Delta, j=1,2,3 aj=xk*ylxl*yk bj=ykyl cj=xlxk delta=area on triangle and the subscripts j,k,l have the values 1,2,3 for u1 and are permuted cyclically for u2 and u3. Here, u can be any functions (velocity, pressure). For P1isoP2/P1, the pressure is interpolated on the big triangles. These triangles are splitted into four triangles and the velocity is interpolated on each of these triangles. 
Re: Shape function of P1isoP2/P1 triangle element
I see. Thank you very much!

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