scholarly journals Physical scale modelling of adhered spill plume entrainment

2010 ◽  
Vol 45 (3) ◽  
pp. 149-158 ◽  
Author(s):  
Roger Harrison ◽  
Michael Spearpoint
Keyword(s):  
Physical Scale ◽  
Scale Modelling

Innovative Mooring in the Port of the Future: Scale Model Testing of the ShoreTension System

2020 ◽  
Author(s):  
S. P. Reijmerink ◽  
N. Bruinsma ◽  
A. J. van der Hout ◽  
M. P. C. de Jong ◽  
C. Clement
Keyword(s):  
Numerical Models ◽  
Low Frequency ◽  
Scale Model ◽  
Performance Limits ◽  
Coastal System ◽  
Physical Scale ◽  
Scale Modelling ◽  
And Performance ◽  
Port Infrastructure ◽  
The Impact

Abstract Moored vessels often experience low-frequency vessel motions when moored in a port due to wave excitation. Under such conditions the loading and offloading of vessels may be hampered when these movements become too large [1,2,3]. Innovative mooring techniques can be used for reducing issues with excessive motions of moored vessels in waves [4,5,6]. Considering applying such techniques as part of the design of mooring facilities and ports is expected to make different approaches to port or mooring facility designs possible. Such techniques, like the ShoreTension (ST) system, are already applied successfully worldwide in ports [7,8,9], however the application and performance limits of such systems under extreme conditions are not well known. This paper describes the results of a research project using physical scale modelling to systematically verify and extend the applicability and performance limits of innovative mooring systems. It resulted in a solid validation database for validating numerical models. The knowledge developed in this research will benefit developers of mooring facilities (including ports) to significantly reduce costs by limiting the need for structures providing shelter from waves. Furthermore, this may also help lowering the impact of port infrastructure on the coastal system when using less invasive infrastructure.

scholarly journals Remarks On The Sources Of Error In The Modelling Of Lunar Geotechnical Structures

2018 ◽  
Vol 40 (2) ◽  
pp. 133-139 ◽  
Author(s):  
Francesco Cafaro ◽  
Emanuele Miticocchio ◽  
Valentina Marzulli
Keyword(s):  
Scale Effects ◽  
Lunar Regolith ◽  
Three Dimensional ◽  
Structure Design ◽  
3D Analysis ◽  
Element Analysis ◽  
Change Of Scale ◽  
Physical Scale ◽  
Scale Modelling ◽  
New Research

AbstractScale modelling should be a very useful strategy for the design of lunar structures. Preventing structural damages in the lunar environment is crucial and scale models are helpful to achieve this aim. The size of these models must be scaled to take into account the different gravitational levels. Since the lunar gravity acceleration is about one-sixth of the terrestrial one, it follows that the models on Earth will be very smaller than the prototype to be realized on the Moon. This strategy will represent an opportunity for engineers working on lunar structure design, provided that the errors, both computational and experimental, related to the change of scale are quantified, allowing reliable extension of the physical scale modelling results to the prototype. In this work, a three-dimensional finite element analysis of walls retaining lunar regolith backfill is described and discussed, in order to provide preliminary results, which can guide a future experimental investigation based on physical scale-modelling. In particular, computational errors related to the scale effects are assessed, with respect to a virtual prototype of the lunar geotechnical structure, and compared with errors from other sources of discrepancy, like the adopted constitutive model, the variability of the geotechnical parameters and the calculation section used in the 3D analysis. The results seem to suggest the soundness of this strategy of modelling and are likely to encourage new research, both numerical and experimental, supporting the structure serviceability assessment.

scholarly journals NOTIONAL PERMEABILITY

2012 ◽  
Vol 1 (33) ◽  
pp. 84
Author(s):  
Rémon Kik ◽  
Jeroen P. Van den Bos ◽  
Jonas Maertens ◽  
Henk Jan Verhagen ◽  
Jentsje W. Van der Meer
Keyword(s):  
Wave Energy ◽  
Rock Slope ◽  
P Value ◽  
P Values ◽  
A Value ◽  
Physical Scale ◽  
Scale Modelling ◽  
The Stability

Different layer design of a rock slope and under layers has a large effect on the strengths on the rock slope itself. In the stability formula developed of VAN DER MEER [1988] this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate more wave energy and therefore requires less weight of the armour layer. The influence of this parameter is thus very important in economic sense. Up until now only three configurations have been tested. In practice often intermediate structures were designed which do not correspond to the standard situations. P-values then have to be estimated in comparison with the known structures, which gives some uncertainty around the P-value. Therefore there is the demand for more validated values of the notional permeability representing other structures. During this study physical scale modelling is used to produce a value of P for a new structure.

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