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Three-dimensional water impact at normal incidence to a blunt structure
I K Chatjigeorgiou1, M J Cooker2, A A Korobkin2
1School of Mathematics, University of East Anglia, Norwich NR4 7TJ, UK; School of Naval Architecture and Marine Engineering, National Technical University of Athens, Athens 15773, Greece.
Proceedings. Mathematical, Physical, and Engineering Sciences
|September 13, 2016
Summary
This study investigates three-dimensional water impact on blunt structures, analyzing slamming loads and pressure-impulse distributions. Findings reveal the significant influence of 3D effects on impact forces, crucial for structural design.
Area of Science:
- Fluid Dynamics
- Hydrodynamics
- Impact Engineering
Background:
- Water impact on structures is a critical phenomenon in naval architecture and offshore engineering.
- Previous studies often simplified the complex 3D fluid dynamics involved in initial impact stages.
- Understanding slamming loads is essential for designing resilient marine and offshore structures.
Purpose of the Study:
- To analyze the three-dimensional (3D) water impact on blunt structures with a rectangular contact region.
- To investigate the distribution of pressure-impulse over the structure's surface during the initial impact phase.
- To evaluate the total impulse and compare 3D effects against strip theories and existing predictions.
Main Methods:
- Utilizing pressure-impulse theory adapted for time-dependent wetted areas.
- Analyzing the incompressible, 3D flow during the initial water impact stage.
- Comparing results with strip theories, numerical simulations, and experimental data.
Main Results:
- The study quantifies the pressure-impulse distribution on the structure's surface.
- It highlights the significant role of three-dimensional effects in determining slamming loads.
- Comparisons show deviations from predictions based on simplified (strip) theories.
Conclusions:
- Three-dimensional effects substantially influence slamming loads during water impact.
- The developed analysis provides a more accurate assessment of impact forces compared to traditional methods.
- This research offers valuable insights for the design and safety of structures subjected to water impacts.
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