818305 Computer-aided simulation of complex thermal hydraulic systems

Lecture and exercise
Semester hours
Lecturer (assistant)
Müllner, Nikolaus
Offered in
Sommersemester 2024
Languages of instruction


•Thermal hydraulic systems and components
•Compressible and incompressible, one- and twophase fluids in thermal hydraulic systems – analytical description; correlations for stationary and non-stationary, laminar and turbulent flow, friction, one- and twophase flow
•Special phenomena: choked flow, countercurrent flow, etc and related correlations
•Heat transfer to compressible and incompressible, one and twophase fluids and induced phase change – example incompressible fluids: subcooled nucleate boiling, saturated nucleate boiling, filmboiling and dryout and related correlations
•Computer aided simulations – balance equations, energy- mass and momentum equations, integration of partial differential equations, implicit/explicit differencing schemes, Courant-limit, practical applications

Practical Exercises:
•Simulation of a pressurizer (Matlab)
•Simulation of a loop of pipes containing a heat sink and heat source (natural circulation)
•Stability analysis natural circulation - dependency of modeling approach (Welander problem)
•1-D Computer programs, example: simulation of piping system with heat source and heat sink (Relap)
•Simple applications

Objective (expected results of study and acquired competences)

Working experience with MATLAB © or GNU Octave.
Basic knowledge on numerical modeling (finite difference method)
Insight in transient analysis of power plants
You can find more details like the schedule or information about exams on the course-page in BOKUonline.