OpenFOAM is the leading free, open source software for computational fluid dynamics, and other computational science and engineering. The annual OpenFOAM Workshop is the most important and influential forum for researchers and users from universities, institutes as well as industries to promote collaborative activities and share recent advances on OpenFOAM in many areas. It is an attractive community event opening to scientist, scholars, engineers, students, users and contributors, regardless of their background and interest. The 1st OpenFOAM Workshop was held in Zagreb, Croatia in 2006. Since then it was held every year successively in Zagreb, Milan, Montréal, Gothenburg, Pennsylvania, Darmstadt, Jeju, Zagreb, Ann Arbor, Guimarães and Exeter. The coming 13th OpenFOAM Workshop (OFW13) will be held in Shanghai, China, on June 24-29, 2018, and hosted and organized by Shanghai Jiao Tong University (SJTU), and co-organized by Journal of Hydrodynamics (JHD) and Shanghai Key Laboratory of Ship Engineering (SKLSE).