The International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering (ISUD) is the most important scientific symposium on ultrasonic Doppler methods. Its purpose is to bring together both specialists and newcomers to share their knowledge about ultrasonic Doppler methods and to present the numerous studies using such methods. As well, we will discuss the development of related methodology and implied future prospects. The biennial ISUD conference series started in the year 1996, when the first ISUD conference was held at the Paul Scherrer Institut (PSI) in Villingen, Switzerland. The following conferences were held in Villingen (1999), Lausanne (2002), Sapporo (2004), Zurich (2006), Prague (2008), Gothenburg (2010), Dresden (2012), Strasbourg (2014) and Tokyo (2016). The next ISUD 11 will be held on September 5-7, 2018 at the Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany.