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1

Numerical evaluation of the wave pattern for fast ships with taking into account the dynamic trim and sinkage

100%
Kraskowski M.
Polish Maritime Research
|
2006
|
tom 13
|
nr 3
This paper presents results of the numerical evaluation of the fast container ship’s wave pattern, based on the RANSE (Reynolds-Averaged Navier Stokes Equations) method with dynamic trim and sinkage taken into account. Evaluating the ship’s running attitude is based on coupling the flow solver with solving the motione quations for thes hiphull.There sultsa represented for four speed values and contain: ship’s running attitude (defined by changes of ship draught and trim angle), wave contours and wave profiles in chosen planes. The computedship’s running attitude and wave profiles are compared with the experimental results
2

Investigations of motion of the lifeboat lowered from ship's deck

51%
Dymarski C., Kraskowski M., Sperski M.
Polish Maritime Research
|
2006
|
tom 13
|
nr 3
A calculation model as well as differential equations of motion of the lifeboat lowered from the deck of the ship under rolling in rough seas, are presented. The equations were numerically integrated. The computer software elaborated on their basis makes it possible to trace instantaneous positions of the lowered lifeboat, calculate velocities and accelerations of its elements, as well as determine forces acting on the boat and persons accommodated in it
3

A method for the accurate numerical prediction of the tip vortices shed from hydrofoils

45%
Flaszynski P., Szantyr J. A., Biernacki R., Dymarski P., Kraskowski M.
Polish Maritime Research
|
2010
|
tom 17
|
nr 2
The possibly accurate numerical prediction of the detailed structure of vortices shed from the tips of hydrofoils is an important element of the design process of marine propellers. The concentrated tip vortices are responsible for the propeller cavitation erosion and acoustic emission. The purpose of the project described in this paper was to develop the numerical method for prediction of the tip vortex structure. In the course of the project the numerical calculations were confronted with the results of experimental measurements. This led to creation of the specific method of construction of the computational grid and to selection of the optimum turbulence model. As a result the reliable method for the accurate numerical prediction of the concentrated tip vortices for different hydrofoil geometry and flow conditions has been developed and validated. This method enables elimination of the unfavourable phenomena related to the tip vortices in the course of the propeller design calculations
4

An experimental and numerical study of the vortices generated by hydrofoils

45%
Szantyr J. A., Biernacki R., Flaszynski P., Dymarski P., Kraskowski M.
Polish Maritime Research
|
2009
|
tom 16
|
nr 3
The article presents the results of the research project concerning the process of formation of the tip vortices shed from hydrofoils of different geometry in different flow conditions. Three hydrofoils resembling the contemporary marine propeller blades have been selected for the study. The experimental part of the project consisted of the LDA measurements of the velocity field in three cross-sections of the vortex generated by the hydrofoils in the cavitation tunnel. The numerical part of the project consisted of calculations of the corresponding velocity field by means of three computer codes and several selected turbulence models. The comparative analysis of the experimental and numerical results, leading to the assessment of the accuracy of the numerical methods, is included
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