scholarly journals Added mass of whipping modes for ships at high Froude number by a free surface boundary element method coupled with strip theory

2004 ◽  
Vol 45 ◽  
pp. 831 ◽  
Author(s):  
D. S. Holloway ◽  
G. A. Thomas ◽  
M. R. Davis
Keyword(s):  
Free Surface ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Froude Number ◽  
Added Mass ◽  
Surface Boundary ◽  
Strip Theory ◽  
High Froude Number ◽  
Element Method

scholarly journals The Prediction of Hull Gesture and Flow Around Ship Based on Taylor Expansion Boundary Element Method

2019 ◽  
Vol 26 (2) ◽  
pp. 198-211
Author(s):  
Jiaye Gong ◽  
Yunbo Li
Keyword(s):  
Boundary Condition ◽  
Free Surface ◽  
Boundary Element Method ◽  
Flow Field ◽  
Boundary Element ◽  
Taylor Expansion ◽  
Surface Condition ◽  
Control Point ◽  
Surface Boundary ◽  
Element Method

Abstract Based on the potential flow theory and traditional boundary element method (BEM), Taylor expansion boundary element method (TEBEM) is introduced in this paper for the prediction of the flow field around ship, as a result, hull gesture and pressure distribution on hull surface are obtained. By this method, dipole strength of every field point is expanded in Taylor expansion, so that approximately continuous hull and free surface boundary condition could be achieved. To close the new equation system, the boundary condition of tangent velocity in every control point is introduced. With the simultaneous solving of hull boundary condition and free surface condition, the disturbance velocity potential could be obtained. The present method is used to predict the flow field and hull gesture of Wigley parabolic hull, Series 60 and KVLCC2 models. To validate the numerical model for full form ship, the wave profile, the computed hull gesture and hull surface pressure of KVLCC2 model are compared with experimental results.

Influence of Free Surface on Hydrodynamic Lift Using a High-Order Boundary Element Method

2015 ◽  
Author(s):  
Amanda J. Costa ◽  
Daniel Kowalyshyn ◽  
Kevin Tuil ◽  
Yin Lu Young ◽  
William Milewski ◽  
...  
Keyword(s):  
Free Surface ◽  
Boundary Element Method ◽  
Boundary Element ◽  
High Order ◽  
Linear Potential ◽  
Surface Boundary ◽  
Ship Hulls ◽  
Surface Boundary Conditions ◽  
Linear Potential Theory ◽  
Element Method

This paper presents the results of hydrofoil simulations at varying depths below the free surface, in surface piercing conditions, and integrated with ship hulls. It focuses on the influence of the free surface on the hydrodynamic loads, susceptibility to cavitation, and resulting surface wave patterns. A fast, high-order, NURBS (Non Uniform Rational B-Spline) based boundary element method has been developed that includes both free surface boundary conditions and steady and unsteady iterative pressure Kutta conditions for simulating lift. Results from this method will be compared to published experimental results, analytical solutions based on linear potential theory, and numerical results from viscous simulations obtained using the commercial CFD solver, ANSYS CFX.

A Novel Boundary Element Method for Linear Elasticity With No Numerical Integration for Two-Dimensional and Line Integrals for Three-Dimensional Problems

1994 ◽  
Vol 61 (2) ◽  
pp. 264-269 ◽  
Author(s):  
A. Nagarajan ◽  
E. Lutz ◽  
S. Mukherjee
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Numerical Integration ◽  
Linear Elasticity ◽  
Three Dimensional ◽  
Contour Method ◽  
Surface Boundary ◽  
Two Dimensional ◽  
Boundary Contour Method ◽  
Element Method

This paper presents a novel application of the boundary element method to solve problems in linear elasticity. The new method is called the Boundary Contour Method. This approach requires no numerical integration at all for two-dimensional problems and numerical evaluation of line integrals only for three-dimensional problems; even for curved line or surface boundary elements of arbitrary shape! Numerical results are presented for some two-dimensional problems.

Study on the Dynamics of the Bubble under the Combined Action of the Bjerknes Effect of the Free Surface and the Buoyancy

2014 ◽  
Vol 644-650 ◽  
pp. 628-631
Author(s):  
Ke Yi Li ◽  
Zhong Cai Pei
Keyword(s):  
Free Surface ◽  
Boundary Element Method ◽  
Boundary Element ◽  
Potential Flow ◽  
Flow Theory ◽  
Motion Direction ◽  
Potential Flow Theory ◽  
Combined Action ◽  
Element Method

When the bubble moves in the vicinity of a free surface, the movement will be affected by the buoyancy and the Bjerknes effect. Blake and Gibson proposed the criterion which determined the motion direction of the jet and the dynamics of bubble. They proposed the jet wouldn’t be formed in the condition that . Based on the potential flow theory, boundary element method (BEM) is used to calculate three typical examples in this paper in order to study the dynamics of the bubble under the combined action of the Bjerknes effect of the free surface and the buoyancy. It is found out during the analysis that the Blake criterion is applicable to predict the conditions that and .

Sign in / Sign up

Export Citation Format

Share Document