Damping Effect in Fluid-Structure Interaction: Application to Slamming Problem

2003 ◽  
Author(s):  
N. Aquelet ◽  
M. Souli
Keyword(s):  
High Pressure ◽  
Physical Phenomenon ◽  
Fluid Structure Interaction ◽  
Underwater Explosion ◽  
Industrial Applications ◽  
Damping Factor ◽  
Local Pressure ◽  
Shipbuilding Industry ◽  
Fluid Structure ◽  
Structure Interaction

During a high velocity impact of a structure on an incompressible fluid, impulse loads with high pressure peaks occur. This physical phenomenon called ‘slamming’ is a concern in the shipbuilding industry because of the possibility of hull damage. Shipbuilding companies are carrying out several studies on the slamming modeling using FEM software. This paper presents the prediction of the local high pressure load on a wedge striking a free surface. The fluid-structure interaction is simulated by a fluid-structure coupling algorithm. This method of coupling, which makes it possible to transmit the efforts in pressure from the Eulerian grid to the Lagrangian grid and vice versa, is a relatively recent algorithmic development. It was successfully used in many scientific and industrial applications: the modeling of the bird strike on the fuselage of a Jet for the Boeing Coporation, underwater explosion shaking the oil platforms, and airbag simulation in automotive industry... Predicting the local pressure peak on the structure requires an accurate fluid-structure interaction algorithm. Thus, some penalty coupling enhancements make the slamming modeling possible. The main improvement is a numerical damping factor which permits to smoothing of the pressure signal.

Damping Effect in Fluid-Structure Interaction: Application to Slamming Problem

2003 ◽  
Author(s):  
N. Aquelet ◽  
M. Souli
Keyword(s):  
High Pressure ◽  
Physical Phenomenon ◽  
Fluid Structure Interaction ◽  
Underwater Explosion ◽  
Industrial Applications ◽  
Damping Factor ◽  
Local Pressure ◽  
Shipbuilding Industry ◽  
Fluid Structure ◽  
Structure Interaction

During a high velocity impact of a structure on an incompressible fluid, impulse loads with high pressure peaks occur. This physical phenomenon called ‘slamming’ is a concern in the shipbuilding industry because of the possibility of hull damage. Shipbuilding companies are carrying out several studies on the slamming modeling using FEM software. This paper presents the prediction of the local high pressure load on a wedge striking a free surface. The fluid-structure interaction is simulated by a fluid-structure coupling algorithm. This method of coupling, which makes it possible to transmit the efforts in pressure from the Eulerian grid to the Lagrangian grid and vice versa, is a relatively recent algorithmic development. It was successfully used in many scientific and industrial applications: the modeling of the bird strike on the fuselage of a Jet for the Boeing Corporation, underwater explosion shaking the oil platforms, and airbag simulation in automotive industry... Predicting the local pressure peak on the structure requires an accurate fluid-structure interaction algorithm. Thus, some penalty coupling enhancements make the slamming modeling possible. The main improvement is a numerical damping factor which permits to smoothing of the pressure signal.

Fluid-Structure Interaction for Hydrodynamic Problems: Impact Between a Tanker Bow Flare and a Submarine

2002 ◽  
Author(s):  
N. Aquelet ◽  
H. Lesourne ◽  
M. Souli
Keyword(s):  
Fluid Structure Interaction ◽  
Underwater Explosion ◽  
Slip Boundary Condition ◽  
Industrial Applications ◽  
Structural Deformation ◽  
Nuclear Submarine ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Slip Boundary ◽  
Eulerian Formulation

A methodology to predict the capacity of a nuclear submarine hull to act as a protective container and energy absorber under impact by an another underwater structure is needed. Principia Marine, company of Research in Shipbuilding (formerly IRCN, Institut de Recherche en Construction Navale), is responding to this need by developing an underwater impact crash prediction methodology based upon LS-DYNA3D software. Several physical phenomena with their own characteristic times follow one another at the time of the shock. So different but complementary tasks to develop this methodology were worked individually. This paper deals with contribution to this ongoing program that breaks up into two objectives. The first goal aims to highlight the effect of water on the structural deformation at the time of the collision between a nuclear submarine and a tanker ram bow, which is generally plane. The two-dimensional modelling of this collision uses an Eulerian formulation for the fluid and a Lagrangian formulation for the structure. The fluid-structure interaction is treated by an Euler/Lagrange penalty coupling. This method of coupling, which makes it possible to transmit the efforts in pressure of the Eulerian grid to the Lagrangian grid and conversely, is relatively a recent algorithmic development. It was successfully used in many scientific and industrial applications: the modelling of the attack of birds on the fuselage of a Jet for the Boeing Corporation, the underwater explosion shaking the oil platforms, and airbag simulation… The requirements of modelling for this algorithm are increasingly pointed. Thus, the second objective of this paper is to compare the results in pressures and velocities near the bulb for two cases, in the first one, the bulb is modelled by a slip boundary condition, in the second one, the bulb is a rigid Lagrangian structure, which involves the use of the Euler/Lagrange penalty coupling.

Fluid-Structure Interaction Analysis on the Performance of the High-Pressure Fuel Pump for Diesel Engines

2016 ◽  
Author(s):  
Dexing Qian ◽  
Ridong Liao ◽  
Jianhua Xiang ◽  
Baigang Sun ◽  
Shangyong Wang
Keyword(s):  
High Pressure ◽  
Diesel Engines ◽  
Interaction Analysis ◽  
Physical Phenomenon ◽  
Fluid Structure Interaction ◽  
Dead Volume ◽  
Fuel Pump ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Spring Force

In this paper, a 3-D fluid-structure interaction (FSI) analysis on the performance of the high-pressure fuel pump for diesel engines is presented. The fluid and structure are two-way coupled and several complex factors are taken into accounts in the FSI model. For instance, the fluid model includes not only the high-pressure fuel pump but also the rail and pressure-control valve which are used to maintain a stable delivery pressure of the pump; Gap boundary condition is adopted to simulate the opening and closing of the valve; The flow is assumed to be nonisothermal and the physical properties of the fuel such as dynamic viscosity and density are functions of pressure and temperature. While in the structure model, the spring force on the valve and the contacts between the valve and the valve seat as well as the top block are considered. The calculated volumetric efficiency losses agree well with the experiments, which indicates that the FSI model established in this study could well predict the physical phenomenon taking place in the high-pressure fuel pump. Several new conclusions can be drawn from the discussions on the results such as the suction efficiency loss due to the delay closing of the inlet valve is extremely small while the suction loss due to the expansion of the high-pressure fuel entrapped in the dead volume is very large.

Fluid Structure Interaction and Airbag ALE for Out of Position

2005 ◽  
Author(s):  
M’hamed Souli ◽  
Nicolas Capron ◽  
Uzair Khan
Keyword(s):  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Industrial Applications ◽  
Ideal Gas ◽  
Crash Test ◽  
Uniform Pressure ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Material Formulation ◽  
Airbag Deployment

A new fluid structure interaction method is presented in the paper. The method is implemented in LSDYA, an explicit three-dimensional multi-physique code. The new algorithm is applied for different problems for industrial applications including airbag deployment in the automotive industry, where a uniform pressure computed empirically is applied to the airbag fabric material. The uniform pressure Airbag simulation does not lead to the right answer for out of position Airbag deployment. An ALE method using fluid mesh for the gas needs to be used to simulate an impact of dummy and the airbag during a crash test. In this paper, we develop the new ALE multi-material formulation and the fluid structure interaction algorithm that we developed in order to solve general fluid structure interaction problems including Airbag inflation using hydrodynamic equations for gas pressure. In the classical uniform pressure problems, the pressure in computed using a simple ideal gas law equation.

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