We simulate the nonradiative excitation energy transfer in an ensemble of poly(p-phenylene vinylene) (PPV) chains the configurations of which were calculated using a random growth algorithm. The polymers are viewed as a series of phenyl-vinyl oligomers of various lengths, separated from one another through conformational defects. Initially excited chromophores, corresponding to short segments of PPV oligomers in the polymer, transfer excitations nonradiatively to longer oligomers of lower electronic energy with transfer rates as described by Forster theory. Transfer occurs in a short period of time (<50 ps) and within a small local area (similar to52 Angstrom) around the initially excited chromophore. We find in our simulations that the majority of the excitation gets trapped in local minima corresponding to medium length oligomers (with six to eight phenyl rings) and does not eventually find the global energy minimum. Excitation transfer dynamics are presented for PPV chains inserted into mesoporous silica matrixes, which are believed to direct the excitation energy from the parts of the chains outside the pores to those inside the pores. We show that this funneling is most efficient if the chains outside the pores are close enough to the target chromophores inside the pores, within a distance defined by an average transfer correlation length.