scholarly journals Magnetohydrodynamic and gasdynamic theories for planetary bow waves

1985 ◽  
pp. 85-107 ◽  
Author(s):  
John R. Spreiter ◽  
Stephen S. Stahara
Keyword(s):  
Bow Waves

scholarly journals Statistical Study of Magnetosheath Jet‐Driven Bow Waves

2020 ◽  
Vol 125 (7) ◽  
Author(s):  
Terry Z. Liu ◽  
Heli Hietala ◽  
Vassilis Angelopoulos ◽  
Yuri Omelchenko ◽  
Rami Vainio ◽  
...  
Keyword(s):  
Statistical Study ◽  
Bow Waves

Effect on Local Sea States of Wave Systems Generated by Passing Vessels

1976 ◽  
Vol 29 (4) ◽  
pp. 385-391
Keyword(s):  
Technical Committee ◽  
Bow Waves ◽  
Bow Wave ◽  
Small Craft ◽  
Great Persistence ◽  
Selection Of

Following a general discussion on the effect of sea states on vessels at a meeting of the Technical Committee, held in London on 7 January 1976, those taking part were invited to submit written contributions, a selection of which is printed below.P. H. Tanner (Glasgow University): It is a matter of experience for most small craft users that the steepest seas encountered in open waters are those that originate from the bow wave systems of passing ships. It is a matter of observation that these bow waves are of great persistence.

Analytical bow waves for fine ship bows with rake and flare

2011 ◽  
Vol 55 (01) ◽  
pp. 1-18
Author(s):  
Francis Noblesse ◽  
Gérard Delhommeau ◽  
Patrick Queutey ◽  
Chi Yang ◽  
Hyun Yul Kim
Keyword(s):  
Parametric Study ◽  
Rake Angle ◽  
Wave Profile ◽  
Wave Crest ◽  
Bow Waves ◽  
Bow Wave ◽  
Hydrodynamic Calculations ◽  
Parametric Studies ◽  
Computational Fluid Dynamics Cfd ◽  
Analytical Relations

The bow wave generated by a steadily advancing ship is considered for a family of fine ruled ship bows with rake and flare. This family of ship bows is defined in terms of four parameters: the ship draft D, the entrance angles a and a' at the top and bottom waterlines, and the rake angle 8. The corresponding bow wave similarly depends on four parameters: the draft-based Froude number F and the three angles a, a', and 8. An extensive parametric study, based on thin-ship theory, is performed to explore the variations of the water height Z0 at the ship stem X = 0, the location X0 (measured from the ship stem) of the intersection of the bow-wave profile with the mean free-surface plane Z = 0, and the bow-wave profile, with respect to the four parameters F, a, a', and 8. This parametric study extends the previously reported similar study of the height Zb of the bow wave and the location Xb of the bow-wave crest. These two complementary parametric studies yield simple analytical relations, which extend relations given previously for wedge-shaped ship bows without rake or flare. In spite of their remarkable simplicity, the analytical relations given here yield bow waves that are comparable to computational fluid dynamics (CFD) waves given by Euler-flow calculations. The analytical relations, which explicitly account for the influence of the four primary parameters F, a, a', and 8, can be used immediately—without hydrodynamic calculations—for ship design, notably at early design stages when the precise hull geometry is not yet known. The study also provides insight for ship bow design. Specifically, it suggests that a bow with positive rake and negative flare may be beneficial, and that a bulb located aft of the stem and integrated with the hull may be an advantageous alternative to a traditional bulb protruding ahead of the bow, in agreement with the results of a hull-form optimization analysis.

scholarly journals Bow shocks, bow waves, and dust waves – II. Beyond the rip point

2019 ◽  
Vol 486 (3) ◽  
pp. 4423-4442 ◽  
Author(s):  
William J Henney ◽  
S J Arthur
Keyword(s):  
Bow Waves ◽  
Bow Shocks

Study of a Container Ship with Breaking Waves at High Froude Number Using URANS and DDES Methods

2019 ◽  
Author(s):  
Jianhua Wang ◽  
Zhen Ren ◽  
Decheng Wan
Keyword(s):  
Free Surface ◽  
Wave Breaking ◽  
High Speed ◽  
Hydrodynamic Performance ◽  
Small Scale ◽  
Breaking Wave ◽  
Container Ship ◽  
Ship Model ◽  
Bow Waves ◽  
Bow Wave

The KRISO container ship model is used for numerical simulations to investigate hydrodynamic performance under high speeds. Unsteady Reynolds-Averaged Navier-Stokes (URANS) and delayed detached eddy simulation (DDES) approaches are used to resolve the flow field around the ship model. High-resolution Volume of Fluid (VOF) technique in OpenFOAM is used to capture the free surface. The present work focuses on the wave-breaking phenomena of high-speed ships. To study the speed effects on the phenomenon of ship bow wave breaking, three different speeds, i.e., Fn = .26, .35, and .40, are investigated for a fixed ship model in calm water. Predicted resistance and wave patterns under Fn = .26 are validated with available experimental data, and a good agreement is achieved. The breaking wave phenomena can be observed from both URANS and DDES results for Froude numbers greater than .35. And the Fn = .40 case shows more violent breaking bow waves. The process of overturning and breaking of bow wave is more complex in the DDES results, and some small-scale free surface features are also captured. The predicted bow wave is compared with the experiment conducted at the China Ship Scientific Research Center. It shows that the DDES results are more accurate. Wave profiles and vorticity field at several cross sections are presented to illustrate the relationship between bow waves and vortices. It is found that the free surface vorticity dissipates quickly in the URANS simulation, which leads to the difference compared with the DDES results.

Ship bow waves

2013 ◽  
Vol 25 (4) ◽  
pp. 491-501 ◽  
Author(s):  
Francis Noblesse ◽  
Gerard Delhommeau ◽  
Hua Liu ◽  
De-cheng Wan ◽  
Chi Yang
Keyword(s):  
Bow Waves

Resonance amplification and viscous attenuation of atmospheric bow waves

1969 ◽  
Vol 74 (23) ◽  
pp. 5418-5424 ◽  
Author(s):  
Eugene M. Wilkins ◽  
Yoshikazu Sasaki
Keyword(s):  
Bow Waves

Simulation of ship breaking bow waves and induced vortices and scars

2007 ◽  
Vol 54 (4) ◽  
pp. 419-451 ◽  
Author(s):  
Robert V. Wilson ◽  
Pablo M. Carrica ◽  
Fred Stern
Keyword(s):  
Bow Waves ◽  
Ship Breaking

Characteristics of Breaking Bow Waves Generated by a 2D+T Wave Maker

2006 ◽  
Author(s):  
Mostafa Shakeri ◽  
Mohammadreza Tavakolinejad ◽  
Matthias Mayer ◽  
James H. Duncan
Keyword(s):  
Water Surface ◽  
Wave Pattern ◽  
Wave Crest ◽  
Maximum Speed ◽  
T Wave ◽  
Bow Waves ◽  
Maximum Water ◽  
Wave Maker ◽  
Rise Height ◽  
Plunging Breaker

Ship bow waves simulated experimentally with a 2D+T wave maker were investigated experimentally. Wave profile measurements are presented for a range of equivalent full-scale ship speeds ranging from 16.5 to 27 knots. At the beginning of the wave maker motion, the water surface rises rapidly up the surface of the wave board which represents the hull of the equivalent ship model. The maximum rise height and the rate of rise increase with increasing equivalent ship speed. Later in the wave maker motion, this point of maximum water height moves away from the wave board and forms the primary crest in the wave pattern. This crest moves at a speed that is about 1.8 times the maximum speed of the wave board. At the higher speeds, this wave crest evolves into a strong plunging breaker with a jet that hits the water surface ahead of the breaker, creating a large splash and entraining large amounts of air. The temporal histories of various geometrical characteristics of the breaker are presented.

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