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Influence of the rheological properties of fluid mud on the open water diagram of the DTC propeller
Citation Link: https://doi.org/10.15480/882.9327
Publikationstyp
Conference Paper
Date Issued
2024-04-04
Sprache
English
TORE-DOI
Start Page
209
End Page
217
Citation
8th International Symposium on Marine Propulsors (smp 2024)
Contribution to Conference
Publisher
Norwegian University of Science and Technology, Department of Marine Technology
ISBN
978-82-691120-5-4
Peer Reviewed
true
The paper presents the results of a CFD study regarding DTC propeller performance in fluid-mud. Since the fluid mud has non-Newtonian rheological properties, conventional CFD models used in the marine context are not applicable in this case and the development and validation of a new simulation environment is required. The development included the implementation of the new rheological model closely capturing the experimental stressstrain curve, multi-fluid solver (air/water/fluid-mud) and the novel turbulence modeling approach, applicable to the fluids with fluctuating apparent viscosity. The developed computational framework is validated in this work for the case of prediction of the resistance of a flat plate submerged into the fluid-mud. Afterwards, the series of open water tests is performed for the DTC propeller for different parameters of the fluid mud and different submersion depths. The fraction of fluid mud in the propeller disk, the limiting viscosity and the fluid mud density are varied in the systematic manner, as these are found to be of the highest significance. This way it is possible to assess the influence of these parameters on the open water diagram of the propeller. For example it is shown, that the fluid mud density is increasing the thrust and torque coefficients at the same time and thus the propeller efficiency remains almost the same. Based on the collected data the correlations are derived and an actuator disk model is developed, which takes into account the influence of particular fluid mud sample on the thrust and torque characteristics. Since the final aim of the project is to predict the maneuvering properties of ship moving in proximity (or in direct contact) of fluid mud, an adequate actuator disk model is required for efficient computations. Direct resolution of propeller geometry in maneuvering simulations is computationally inefficient.
Subjects
Open water diagram
Multiphase
non-Newtonian fluid
actuator disk
DDC Class
620: Engineering
Publication version
publishedVersion
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Name
Shevchuk-InfluenceOfTheRheologicalPropertiesOfFluidMudOnTheOpenWaterDiagr-1141-1-final.pdf
Type
Main Article
Size
5.21 MB
Format
Adobe PDF