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| double D = 1e-2; // diffusion coef
double s=-1.; // reaction coef \lambda
double exact(double x, double y, double z) { // analytical solution
double c = 3.*M_PI/50.;
double d = 50.*M_PI;
return exp(-sq((d*(x*y-c))));
}
double src(double x, double y, double z) { // source term for the Poisson Helmholtz equation
double u;
double c = 3.*M_PI/50.;
double d = 50.*M_PI;
double f = exp(-sq((d*(x*y-c))));
u = -2.*D*(sq(d*x) + sq(d*y))*(1. - 2.*d*d*sq(x*y-c)) + s;
return u*f;
}
|
