Discrete ordinates method-like transport computation with equivalent group condensation and angle-collapsing for local/global iteration

► Angle-dependent total cross section is generated during fine-to-few group condensation, and implemented/demonstrated its efficacy in neutron transport computation. ► Angle-collapsing concept is introduced to further reduce calculational burden. ► A local/global iteration framework is also proposed based on half-overlapped nodes. ► The iteration converges within one or two iterations (for the test problem), reproducing the fine-group reference solution.