Hi,
I need to find out the effect of muddy bottoms in ship resistance in shallow water canals. For that I need to simulate two interfaces, ie) air water interface and mud water interface (I have to specify the thickness of the mud layer). How this done in STARCCM+?
Thanks, and regards.
NUMERICAL MODELLING OF THE MUDDY LAYER EFFECT 1 ON SHIP’S RE2
SISTANCE AND SQUAT
3
4 Sami Kaidi, CEREMA-DtecEMF, Margny les Compiègne, France ;
5 Emmanuel Lefrançois, Université de technologie de Compiègne Sorbonne universités, laboratoire Roberval FRE 2012
6 CNRS, France ;
7 Hassan Smaoui, CEREMA-DtecEMF, Margny les Compiègne, France ;
8
9 ABSTRACT
10 The increasing use of maritime transport has led to an increase in ship size. However, the dimensions of channels and
11 harbours cannot follow the expansion rate of ships. Large ships will experience shallow water effects such as the bottom
12 effect more severely, which plays an important role in the manoeuvrability and the stability of ships. To reduce naviga13
tional restriction in estuary environment and close to ports (see Figure 1), the World Association for Waterborne
14 Transport Infrastructure (PIANC) established the concept of the nautical bottom. Using this concept, ships can navigate
15 with both small and negative under keel clearance (UKC) relative to the water-mud interface. Hence, the aim of this
16 work, is to conduct a numerical investigation in order to study the influence of the muddy seabed on the ship’s manoeu17
vrability especially on the ship’s resistance and squat. Accordingly, a 3D Computational Fluid Dynamics (CFD) model
18 based on the Volume of Fluid (VoF) method was used to simulate the multiphase flow for various setups. Four parame19
ters were tested: the mud properties, the ship's speed, the mud thickness and the UKC value relative to the water-mud
20 interface. The numerical results of this investigation were in reasonable agreement with experimental data. Through this
21 investigation it was also shown the performances of the CFD method to simulate setups difficult to achieve in towing
22 tank.
23
© 2020. This manuscript version is made available under the Elsevier user license
https://www.elsevier.com/open-access/userlicense/1.0/
NUMERICAL MODELLING OF THE MUDDY LAYER EFFECT 1 ON SHIP’S RE2
SISTANCE AND SQUAT
3
4 Sami Kaidi, CEREMA-DtecEMF, Margny les Compiègne, France ;
5 Emmanuel Lefrançois, Université de technologie de Compiègne Sorbonne universités, laboratoire Roberval FRE 2012
6 CNRS, France ;
7 Hassan Smaoui, CEREMA-DtecEMF, Margny les Compiègne, France ;
8
9 ABSTRACT
10 The increasing use of maritime transport has led to an increase in ship size. However, the dimensions of channels and
11 harbours cannot follow the expansion rate of ships. Large ships will experience shallow water effects such as the bottom
12 effect more severely, which plays an important role in the manoeuvrability and the stability of ships. To reduce naviga13
tional restriction in estuary environment and close to ports (see Figure 1), the World Association for Waterborne
14 Transport Infrastructure (PIANC) established the concept of the nautical bottom. Using this concept, ships can navigate
15 with both small and negative under keel clearance (UKC) relative to the water-mud interface. Hence, the aim of this
16 work, is to conduct a numerical investigation in order to study the influence of the muddy seabed on the ship’s manoeu17
vrability especially on the ship’s resistance and squat. Accordingly, a 3D Computational Fluid Dynamics (CFD) model
18 based on the Volume of Fluid (VoF) method was used to simulate the multiphase flow for various setups. Four parame19
ters were tested: the mud properties, the ship's speed, the mud thickness and the UKC value relative to the water-mud
20 interface. The numerical results of this investigation were in reasonable agreement with experimental data. Through this
21 investigation it was also shown the performances of the CFD method to simulate setups difficult to achieve in tow
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