Numerical prediction of ship hydrodynamic performance at design stage using computational fluid dynamics (CFD) technique is a most important and challenging subject in the field of ship hydrodynamics.
Numerical prediction of ship hydrodynamic performance using computational fluid dynamics (CFD) technique at design stage is an important and challenging subject in the field of ship hydrodynamics.
Amethod for the estimation of hydrodynamic forces of fin-rudder on slender body of revolution is presented, based on the results of series model tests which were performed to obtain steady and rotary force derivatives.
New nondimensional geometric parameters of fin-rudder are introduced, so that the problem of interaction of hydro-dynamic forces between fin-rudder and main body is well resolved. Based on the wing theory and the orthogonal design method used for the analysis of the results of series model tests, a semi-empirical expression for the determination of hydrodynamic forces of fin-rudder is obtained.
Considering the effect of the bottom on the hydrodynamic properties of the rudder, the authors are discussing with the help of the numerical value test method that the fluid dynamic force of rudder varies with the distance from the ship bottom to the rudder top.
An unsteady nonlinear vortex-lattice method is presented for calcula-tion of hydrodynamic forces acting on the rudder with tip edge separation. The numerical method is applied to three rectangular rudders with aspectratio 2.4,1.0 and 0.211 respectively.
The linearity of calibration curve provided by SEKI was similar to that offered by non-bias hydrodynamic injection (HDI) but significantly better than that obtained by EKI.
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Based on hydrodynamic equations, an equation formulizing the parametric instability was derived.
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Based on the variational constraint approach, the variational form of Reynolds equation in hydrodynamic lubrication is revised continuously to satisfy certain constraints in the cavitation zone of oil film field.
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Method of internal 3D flow field numerical simulation for hydrodynamic torque converter
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The performance parameters of the hydrodynamic torque converter were predicted.
The wake model, suggested by T. Y. Wu in 1962, is linearized and applied to treat the two-dimensional supereavitating or partially cavitating hydrofoil of the arbitrary camberline. The rear end of the cavity in this model, which may also be called as" open type model" in the linearized theory, is regarded as nonclosed. At the downstream of the cavity, there is a wake region stretched to the infinity. For a part of the free streamline near the hydrofoil, the pressure is assumed to be constant and equal to th...
In this paper, we have generalized the "Prago-Figiaivsky's" wing theory of small aspect ratio, have established the formulas of the coefficients of normal force, induced resistance and the center of pressure. We have also suggested a way to evaluate the lower limit of the critical angle of attack. After re-calculating the hydrodynamic forces of a rectangular plate, we have applied this method to rudder behind the ship and propeller. Results are in agreement with the known experimental or theoretical r...
When a glider moves in a seaway, it yields oscillations. M. D. Haskind discussed the non-steady motions of small curved planing plate by using the theory of complex functions, and obtained the general expression of hydrodynamic forces. In this paper, the pressure distribution of hydrodynamic forces on the planing plate was obtained with another method. First, in solving a pulsating pressure point δ(x)cos(wt ε) on the free surface, the expressions of its normal induction velocity v(x, t; U, ω, ε)...