[Getdp] Characteristic function in galerkin term
sdurand
sdurand at cage.ugent.be
Fri Jun 19 09:30:08 CEST 2009
Hello everybody,
is it possible to use a characteristic function of the form
Iee [domainTot] = ($X^2 + $Y^2 <1 ) ? 1 : 0;
in the Galerkin term to integrate over an inner domain? I want to use
something like
Galerkin { [ Iee[]*({u}-{ud}), {p} ]; In domainTot;
Jacobian Vol; Integration GradGrad; }
where domainTot is the whole domain and the integral should be
calculated over the unit circle.
I always get the "Null right hand side of linear system"-remark.
However, if I plot the function Iee[]*( u - ud ) in gmsh after
postprocessing, it is indeed zero outside, but it is certainly not zero
inside the unit circle. How can I solve this problem?
Thank you,
Stephane
--
Stephane Durand
Department of Mathematical analysis
Research group of Numerical Functional Analysis and Mathematical
Modelling
Ghent University
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