In this collaborative study with the group of Prof. Liangbing Hu in the Department of Materials Science and Engineering, UMD, we describe a reversed tree design of wood that utilizes the hierarchical micro-nanostructures of the wood and the long path length afforded by the “reverse” design for efficient filtration…SMIEL’s contribution in this paper is the through computational fluid dynamics model (developed by SMIEL’s former PhD and Postdoc, Dr. Guang Chen) to understand the water transport in such reversed tree design. This is Guang’s 26th paper from the paper.