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发表于 2011-4-27 13:18:16
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来自 美国
Let us talk about a simple 1D example.
Governing equation:
-u'' = f 0<x<L
u(0) = u(L) = 0
The weak form is
L(u, v) = F(v)
where L(u, v) = (u',v')=int^L_0(u', v'), F(v) = (f, v)=int^L_0(f, v)
Let us introduce the approximation u = uh=sum^N_i U_i*phi_i, v = vh = {phi_k}(k = 1, ..,N). Namely if the test function vh is chosen to be the ones used to approximate trial function uh, we have Galerkin method.
L(uh, vh) = F(vh) <------------Galerkin method
If the shape function phi_i is chosen to be piecewise polynomial, we have finite element method. |
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