(07/2019 – 06/2022)

Within the scope of the project, the influence of pre-swirl ducts (PSD) on the manoeuvring behaviour of complete ships, in particular the course stability, and the interaction of the pre-swirl duct with rudder and propeller will be investigated.


Title: Investigation of the influence of pre-swirl ducts/pre-swirl nozzles on the manoeuvring char-acteristics of complete ships – PSDMan
SVA: Manoeuvring behaviour of complete ships with pre-swirl nozzle
Term: 07/2019 – 06/2022
Project Manager: Lars Lübke
Founding: Federal Ministry for Economic Affairs and Energy
Project administration: Project Management Jülich
Partners: IBMV, BMS, TUHH
Reg.-No.: 03SX488C

The manoeuvring characteristics of the model are determined by tests with and without a balancing nozzle. The focus here is on the yaw stability. Field tests are necessary to carry out turning circle tests. The nozzle forces are measured during the manoeuvres in order to be able to determine load peaks.
The measurements will be supplemented or extended by extensive numerical simulations, whereby the experimental results will be used to validate the simulation results. An efficient setup for performing manoeuvre simulations will be developed. The forces on the ship are to be calculated for different manoeuvres. Both captive tests (guided ship/model) and free manoeuvre simulations will be carried out. The use of overlapping grids is crucial for carrying out the numerical simulations, which should enable, for example, rudder control simulations to be carried out more easily. Different turbulence models are used, ranging from a fully turbulent flow with a two-equation model to hybrid methods. The simulations are carried out in the scale of the model as well as of the ship, which allows an estimation of the Reynolds number effects. The course stability is to be quantified with the stability index, among other things. The scope of the simulation includes “pure yaw” and “pure sway”. This enables the determination of the manoeuvring characteristics on the basis of a restricted set of coefficients. Furthermore, manoeuvres such as a turning circle simulation are to be simulated directly.
Another goal is to carry out a coordinated design of the PSD and propeller under consideration to the manoeuvring behaviour, taking into account the mutual interactions. The power reduction shall be quantified experimentally.
As a result of the project, the influence of the PSDs on the manoeuvring behaviour will be quantified and the forces on the PSD during manoeuvring will be determined.