Dynamic systems are difficult for students to understand. A common method to introduce them to the students are guided laboratory exercises. eLearning modules with interactive simulators of the system could serve as a modern alternative or addition to the laboratory. The students would interact with a digital twin of the system on their computer instead of the real machine.

The Competence Center for Fluid Mechanics and Hydraulic Machines has built up a pump test bench in its own fluid laboratory in order to perform laboratory exercises and trainings on hydraulic pump systems. The instructors believe to achieve a didactic advantage with a digital twin of the pump test bench at hand. Students could use the digital twin to familiarise themselves with the system, independently of time and place even before their visit in the lab. The actual laboratory experiment itself then become more efficient and the students benefit more from the exercises.

The goal of this thesis is to create a high-performance, physically correct mathematical model of the pump test bench. For that purpose, the bench is used to study the basics of hydraulic-thermal systems in more detail and it is examined, how to model such systems in a stable and performant way. In order to achieve a realistic digital reproduction of the test bench, the characteristics of all pumps are measured in the laboratory. Suitable models for all installed components in the test bench are selected and/or created. All these models are validated and tested for stability and performance, and later combined to form the overall system.

The result is a realistic, high-performance dynamic system model of the pump test bench, realised in the modeling language Modelica, where the strand containing the pump turbine is not involved yet.