Computational analysis of asymmetric water entry of wedge and ship section at constant velocity

2016 ◽  
Author(s):  
Md. Mashiur Rahaman ◽  
Al Habib Ullah ◽  
Laboni Afroz ◽  
Sharmin Shabnam ◽  
M. A. Rashid Sarkar
Keyword(s):  
Constant Velocity ◽  
Computational Analysis ◽  
Water Entry ◽  
Asymmetric Water Entry

Numerical Analysis of Impact Loads on Subsea Structures During Water Entry in Presence of Waves

2020 ◽  
Author(s):  
Gustavo Garcia Momm ◽  
Ivan Fábio Mota de Menezes
Keyword(s):  
Constant Velocity ◽  
Oil And Gas ◽  
Free Fall ◽  
Water Entry ◽  
Gas Production ◽  
Rigid Bodies ◽  
Bottom Surface ◽  
Impact Loads ◽  
Flat Bottom ◽  
The Impact

Abstract Subsea structures employed on offshore oil and gas production systems are likely to be subject to severe loads during deployment. Lowering these structures through the wave zone is a critical operation and the prediction of the loads associated is complex as it involves accelerations of these bodies induced by the vessel motion and the sea surface displacements. This work presents a numerical approach to assessment of the effect of waves on the impact loads that subsea structures are subject to during water entry. A 2D one degree of freedom model using the SPH method was developed to estimate slamming loads on rigid bodies during water entry considering both calm and wavy surfaces. Initially the model was employed to simulate the water entry of wedge considering both free fall and constant velocity cases, obtaining loads profile similar to experiments and numerical simulations from the literature. Later, the constant velocity model was configured to a flat bottom surface rigid body in order to represent a subsea manifold. A regular waves generator provided different wavelength, height and phase enabling slamming load assessment in various situations.

Effect of Inlet Plenum on Pressure Drop and Velocity in Fractal Micro Channels

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Gurjit Singh ◽  
S.S. Sehagal
Keyword(s):  
Reynolds Number ◽  
Pressure Drop ◽  
Aspect Ratio ◽  
Constant Velocity ◽  
Computational Analysis ◽  
Three Dimensional ◽  
Micro Channel ◽  
Ratio Model ◽  
Micro Channels ◽  
Inner Channel

The computational analysis for micro channel flow in a branched network was investigated by three dimensional CFD approach. The effect of the change of Inlet Plenum (IP) size at a constant Aspect Ratio (AR) of the outermost channel on pressure drop in a fractal branched micro channel was performed. The properties are compared along a particular path and it was observed that the pressure drop along a bifurcated path has considerably less effect when compared to that of the outer most straight branched channel for a constant aspect ratio model. Pressure does not change significantly if we change the IP radius even when all other parameters are constant. Velocity in the inner channel after a straight run has reduced significantly even for same AR and Reynolds Number (Re). This leads to the conclusion that the IP size affects the velocity after the bifurcation.

Lattice Boltzmann modeling of water entry problems

2014 ◽  
Vol 25 (12) ◽  
pp. 1441012 ◽  
Author(s):  
A. Zarghami ◽  
G. Falcucci ◽  
E. Jannelli ◽  
S. Succi ◽  
M. Porfiri ◽  
...  
Keyword(s):  
Lattice Boltzmann ◽  
Constant Velocity ◽  
Water Entry ◽  
Two Dimensional ◽  
Weakly Compressible ◽  
Pile Up ◽  
Momentum Fluxes ◽  
Two Dimensional Flow ◽  
Boltzmann Method ◽  
Bounce Back

This paper deals with the simulation of water entry problems using the lattice Boltzmann method (LBM). The dynamics of the free surface is treated through the mass and momentum fluxes across the interface cells. A bounce-back boundary condition is utilized to model the contact between the fluid and the moving object. The method is implemented for the analysis of a two-dimensional flow physics produced by a symmetric wedge entering vertically a weakly-compressible fluid at a constant velocity. The method is used to predict the wetted length, the height of water pile-up, the pressure distribution and the overall force on the wedge. The accuracy of the numerical results is demonstrated through comparisons with data reported in the literature.

Experimental characterization of oblique and asymmetric water entry

2018 ◽  
Vol 92 ◽  
pp. 141-161 ◽  
Author(s):  
Simonluca Russo ◽  
Mohammad Jalalisendi ◽  
Giacomo Falcucci ◽  
Maurizio Porfiri
Keyword(s):  
Water Entry ◽  
Experimental Characterization ◽  
Asymmetric Water Entry

scholarly journals An experimental investigation into the constant velocity water entry of wedge-shaped sections

2008 ◽  
Vol 35 (14-15) ◽  
pp. 1463-1478 ◽  
Author(s):  
T. Tveitnes ◽  
A.C. Fairlie-Clarke ◽  
K. Varyani
Keyword(s):  
Experimental Investigation ◽  
Constant Velocity ◽  
Water Entry ◽  
Velocity Water
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