Alternate closures for radiation transport using Legendre polynomials in 1D and spherical harmonics in 2D

► The traditional closure causes waves to propagate slower than the speed of light. ► A new angle closure is presented that propagates waves exactly at c. ► Scaling the nth equation may greatly improve the accuracy of transport solutions. ► More accurate solutions are found without added computational cost. ► The same scaling procedure and scale factors work in one- and multi-dimensions.