scholarly journals A COMPARISON STUDY ON THE RESISTANCE CALCULATION OF PLANNING BOAT

2021 ◽  
Vol 5 (12) ◽  
Author(s):  
Do Quang Khai ◽  
Nguyen Thi Thu Quynh ◽  
Nguyen Manh Chien
Keyword(s):  
Computational Fluid Dynamic ◽  
Water Surface ◽  
High Speed ◽  
Dynamic Method ◽  
Fluid Dynamic ◽  
Empirical Method ◽  
Comparison Study ◽  
Hydrodynamic Problem ◽  
Lifting Force ◽  
Calculation Results

Calculation of the resistance and trim of highspeed boat at planning regime is a complex hydrodynamic problem. At the planning regime, with the aid of lifting force, the boat is lifted over the water surface with high trim angle. Many methods have been applied to calculate the resistance and the trim of the high-speed boat at this planning regime. This paper will study the two typical methods, the first one is empirical method by Savitsky [1] and the second one is the computational fluid dynamic method (CFD). The calculation results of two methods are compared with experimental results.

High-Speed Passenger and Intercity Train Aerodynamic Computer Modeling

2000 ◽  
Author(s):  
Samuel Holmes ◽  
Martin Schroeder ◽  
Elton Toma
Keyword(s):  
United States ◽  
Wind Speed ◽  
Computational Fluid Dynamic ◽  
High Speed ◽  
Fluid Dynamic ◽  
The United States ◽  
Motion Simulation ◽  
High Speed Train ◽  
Aerodynamic Loads ◽  
Train Speed

Abstract With the onset of high-speed passenger train service in the United States, the Federal Railroad Administration (FRA) and railroad agencies are concerned with the aerodynamic effects these trains will have on lightweight freight equipment, such as empty double stack container cars. This paper presents the results of a research project that evaluated this interaction. In this study we conducted a series of computational fluid dynamic (CDF) calculations to characterize the aerodynamic loads on a container consist passed by a high-speed train. A train motion simulation program was used to determine resultant motion and risk of overturning or derailment of the container consist. Numerous cases were studied in which train speed and wind speed and direction were varied.

Calculation of Metzner Constant for Double Helical Ribbon Impeller by Computational Fluid Dynamic Method

2008 ◽  
Vol 16 (5) ◽  
pp. 686-692 ◽  
Author(s):  
Minge ZHANG ◽  
Lühong ZHANG ◽  
Bin JIANG ◽  
Yuguo YIN ◽  
Xingang LI
Keyword(s):  
Computational Fluid Dynamic ◽  
Dynamic Method ◽  
Fluid Dynamic ◽  
Helical Ribbon

Three-dimensional computational fluid dynamic analysis of high-speed water-lubricated hydrodynamic journal bearing with groove texture considering turbulence

2021 ◽  
pp. 135065012199851
Author(s):  
Huihui Feng ◽  
Shuyun Jiang ◽  
Yanqin Shang-Guan
Keyword(s):  
Computational Fluid Dynamic ◽  
High Speed ◽  
Journal Bearing ◽  
Fluid Dynamic ◽  
Load Capacity ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Computational Fluid Dynamic Analysis ◽  
Hydrodynamic Journal Bearing ◽  
Groove Texture

Water-lubricated bearings have attracted increasing attention in the field of high-speed machine tools for their low friction due to low viscosity. However, new problems, in particular, insufficient load capacity, are on the way. To the point, groove-textured journal bearing is adopted in this study. Aiming at investigating the effects of groove texture on high speed, water-lubricated, hydrodynamic journal bearing precisely, and thoroughly, three-dimensional computational fluid dynamic analyses considering cavitation and turbulence are undertaken to assess the tribological performances of the bearing. To reduce the amount of three-dimensional modeling and meshing work, mesh deformation is presented. The numerical results are compared with experiments to verify the validity of the present models and calculation procedures. Pressure distribution, load capacity, and friction of groove-textured water-lubricated journal bearing are analyzed with respect to operating conditions and geometric parameters. Comparisons between groove-textured water-lubricated journal bearing and smooth bearing are carried out to find out the influence of groove texture. It is found that the groove texture can achieve a remarkable improvement of load capacity at a smaller eccentricity ratio and higher rotary speed. The load capacity is affected by the combined effects of groove depth, width, and length. However, generally, the friction force of water-lubricated journal bearing is slightly influenced by groove texture. Results can provide theoretical guidance for the optimal design of groove-textured water-lubricated journal bearing under different operating parameters.

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