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Wyszukujesz frazę "Tavakoli, S." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Calm water performance of hard-chine vessels in semi-planing and planing regimes
Autorzy:
Ghadimi, P.
Tavakoli, S.
Dashtimanesh, A.
Powiązania:
https://bibliotekanauki.pl/articles/259591.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hard-chine vessels
planing and semi-planing regimes
performance prediction
2D+T theory
Opis:
In the current paper, a mathematical model is developed for performance prediction of hard-chin boats which can be used in both semi-planing and planing regimes. The proposed model bases on the 2D+T theory and implements pressure distributions over the length of the hull in order to compute the forces. To determine the forces in the semiplaning range, a function is proposed for the non-dimensional length at which the transom effect appears. Three drag components, which are: frictional drag, induced drag, and spray drag, are considered in the computations performed using an iterative method to satisfy two equilibrium equations. The validity of the proposed method is verified by comparing the predicted trim angle and resistance against the available experimental data. Based on this comparison, it is observed that the proposed method reveals satisfying accuracy in both semi-planing and planing regimes. The method is then used to study variation of hydrodynamic and hydrostatic forces as the hull makes a transition from the semi-planing regime to the planing regime. In addition, different components of the resistance are analyzed.
Źródło:
Polish Maritime Research; 2016, 4; 23-45
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of boundary layer control method on hydrodynamic characteristics and tip vortex creation of a hydrofoil
Autorzy:
Ghadimi, P.
Araz-Tanha, A.
Nemati-Kourabbasloo, N.
Tavakoli, S.
Powiązania:
https://bibliotekanauki.pl/articles/259965.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
steady water injection
boundary layer control
hydrofoil
NACA 0015
tip vortex
Opis:
There is currently a significant focus on using boundary layer control (BLC) approach for controlling the flow around bodies, especially the foil sections. In marine engineering this is done with the hope of increasing the lift – to – drag ratio and efficiency of the hydrofoils. In this paper, effects of the method on hydrodynamic characteristics and tip vortex formation of a hydrofoil are studied. Steady water injection at the tip of the hydrofoil is simulated in different conditions by using ANSYS-CFX commercial software. Validity of the proposed simulations is verified by comparing the obtained results against available experimental data. Effects of the injection on the lift, drag, and lift – to – drag ratio are studied and the ranges within which the injection has the most positive or negative effects, are determined. Furthermore, flow pattern and pressure variation are studied upon the water injection to determine the most positive and negative case and to ascertain the main reasons triggering these phenomena.
Źródło:
Polish Maritime Research; 2017, 2; 27-39
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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