scholarly journals Numerical modeling of three dimensional self-gravitating Stokes flow problem with free surface

2011 ◽  
Vol 4 ◽  
pp. 1506-1515 ◽  
Author(s):  
Mikito Furuchi
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Stokes Flow ◽  
Flow Problem ◽  
Three Dimensional

On the interaction of an infinite shallow draft cylinder oscillating at the free surface with a train of oblique waves

1969 ◽  
Vol 39 (2) ◽  
pp. 227-255 ◽  
Author(s):  
C. J. Garrison
Keyword(s):  
Free Surface ◽  
Flow Problem ◽  
Wave Train ◽  
Three Dimensional ◽  
Infinite Length ◽  
Pressure Amplitude ◽  
Oblique Angle ◽  
Rigorous Solution ◽  
Cylinder Axis ◽  
Fixed Cylinder

This paper presents the practical and rigorous solution of the potential flow problem associated with the oscillation of a shallow-draft cylinder of infinite length on a free surface. The problem is three-dimensional to the extent that the amplitude of the cylinder oscillation is periodic along its axis as well as with time. The complementary problem associated with the interaction of the fixed cylinder with an incident wave train aligned at some oblique angle with respect to the cylinder axis is also treated. The use of a Green's function reduces the problem to an integral equation which is solved numerically. Numerical results are computed for pressure amplitude distributions, force coefficients, added mass and damping coefficients, transmission and reflexion coefficients and wave height ratios.

scholarly journals Converging three-dimensional Stokes flow of two fluids in a T-type bifurcation

1994 ◽  
Vol 270 ◽  
pp. 51-72 ◽  
Author(s):  
Joseph Ong ◽  
Giora Enden ◽  
Aleksander S. Popel
Keyword(s):  
Finite Element Method ◽  
Shear Stress ◽  
Stokes Flow ◽  
Flow Problem ◽  
Viscosity Ratio ◽  
Three Dimensional ◽  
Side Branch ◽  
The Finite Element Method ◽  
Two Fluids ◽  
Flow Through

Studies of three-dimensional Stokes flow of two Newtonian fluids that converge in a T-type bifurcation have important applications in polymer coextrusion, blood flow through the venous microcirculation, and other problems of science and technology. This flow problem is simulated numerically by means of the finite element method, and the solution demonstrates that the viscosity ratio between the two fluids critically affects flow behaviour. For the parameters investigated, we find that as the viscosity ratio between the side branch and the main branch increases, the interface between the merging fluids bulges away from the side branch. The viscosity ratio also affects the velocity distribution: at the outlet branch, the largest radial gradients of axial velocity appear in the less-viscous fluid. The distribution of wall shear stress is non-axisymmetric in the outlet branch and may be discontinuous at the interface between the fluids.

Two-dimensional bubbles in slow viscous flows

1968 ◽  
Vol 33 (3) ◽  
pp. 475-493 ◽  
Author(s):  
S. Richardson
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Cross Section ◽  
Stokes Flow ◽  
Function Theory ◽  
Three Dimensional ◽  
Viscous Flows ◽  
Bubble Surface ◽  
Two Dimensional ◽  
Elliptical Cross

The representation of a biharmonic function in terms of analytic functions is used to transform a problem of two-dimensional Stokes flow into a boundary-value problem in analytic function theory. The relevant conditions to be satisfied at a free surface, where there is a given surface tension, are derived.A method for dealing with the difficulties of such a free surface is demonstrated by obtaining solutions for a two-dimensional, in viscid bubble in (a) a shear flow, and (b) a pure straining motion. In both cases the bubble is found to have an elliptical cross-section.The solutions obtained can be shown to be unique only if certain restrictive assumptions are made, and if these are relaxed the same methods may give further solutions. Experiments on three-dimensional inviscid bubbles (Rumscheidt & Mason 1961; Taylor 1934) demonstrate that angular points appear in the bubble surface, and an analysis is presented to show that such a discontinuity in a two-dimensional free surface is necessarily a genuine cusp and the nature of the flow about such a point is examined.

Prediction of Ship Motions Via a Three-Dimensional Time-Domain Method Following a Quad-Tree Adaptive Mesh Technique

2020 ◽  
Vol 27 (1) ◽  
pp. 29-38
Author(s):  
Teng Zhang ◽  
Junsheng Ren ◽  
Lu Liu
Keyword(s):  
Free Surface ◽  
Incident Wave ◽  
Time Domain ◽  
Three Dimensional ◽  
Adaptive Mesh ◽  
Wave Profile ◽  
Time Domain Method ◽  
Ship Motions ◽  
Quad Tree ◽  
Mesh Technique

AbstractA three-dimensional (3D) time-domain method is developed to predict ship motions in waves. To evaluate the Froude-Krylov (F-K) forces and hydrostatic forces under the instantaneous incident wave profile, an adaptive mesh technique based on a quad-tree subdivision is adopted to generate instantaneous wet meshes for ship. For quadrilateral panels under both mean free surface and instantaneous incident wave profiles, Froude-Krylov forces and hydrostatic forces are computed by analytical exact pressure integration expressions, allowing for considerably coarse meshes without loss of accuracy. And for quadrilateral panels interacting with the wave profile, F-K and hydrostatic forces are evaluated following a quad-tree subdivision. The transient free surface Green function (TFSGF) is essential to evaluate radiation and diffraction forces based on linear theory. To reduce the numerical error due to unclear partition, a precise integration method is applied to solve the TFSGF in the partition computation time domain. Computations are carried out for a Wigley hull form and S175 container ship, and the results show good agreement with both experimental results and published results.

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