Explicit FE simulation of slamming load on rigid wedges with various deadrise angles during water entry

2012 ◽  
pp. 413-420 ◽  
Keyword(s):  
Fe Simulation ◽  
Water Entry ◽  
Slamming Load

Slam induced loads on a 3D bow with various pitch angles

2019 ◽  
pp. 1-18 ◽  
Author(s):  
Yiwen Wang ◽  
Weiguo Wu ◽  
Shan Wang ◽  
Carlos Guedes Soares
Keyword(s):  
Impact Velocity ◽  
Pitch Angle ◽  
Water Entry ◽  
Model Tests ◽  
Experimental Measurements ◽  
Pressure Distributions ◽  
Slamming Load

Abstract A 3D water entry of a typical bow model of River-to-Sea ship is studied experimentally. A large number of systematic experiments have been performed for the bow model with different pitch angles. Considering various pitch angles and impact velocities in the model tests, the slamming pressure distributions on the bottom of the bow are presented and discussed. The measured slamming pressures on the bow are identified in terms of the maximum slamming coefficient. The effects of the pitch angle and impact velocity on slamming pressure are discussed as well, based on the experimental measurements. It is shown that the slamming load on the bottom of the model increases as the pitch angle decreases in most cases. With a higher impact velocity, the coefficient of the maximum slamming pressure is smaller for most of the tested cases.

Evolution of slamming load and flow field in water-entry process of trimaran ship section

2020 ◽  
Vol 205 ◽  
pp. 107319 ◽  
Author(s):  
Zhi Zong ◽  
Yifang Sun ◽  
Yichen Jiang ◽  
Tiezhi Sun ◽  
Yiquan Yu
Keyword(s):  
Flow Field ◽  
Water Entry ◽  
Slamming Load

scholarly journals Numerical and experimental investigation on the oblique water entry of cylinder

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042094088
Author(s):  
Longquan Sun ◽  
Duliang Wang ◽  
Yingyu Chen ◽  
Guoxun Wu
Keyword(s):  
Water Entry ◽  
Initial Time ◽  
Lagrange Method ◽  
Simulation Research ◽  
Motion State ◽  
Slamming Load ◽  
Load Characteristics ◽  
Air Cavities ◽  
The Relationship ◽  
Good Agreement

The study of water entry cavity and the analysis of load characteristics are hot topics in water entry research. The coupled Euler–Lagrange method is used to carry out simulation research on the water entry process of a cylinder. Aiming at the water vapor mixing phenomenon caused by structure slamming on the water at the initial time of water entry, the slamming load is further studied by correcting the sound speed in the water. The differences between the calculated results obtained by adjusting the number of units in the numerical simulation prove the convergence of the numerical method. Water entry experiments of a cylinder were carried out, and the results are in good agreement with the simulation data. The motion state simulation and analysis are carried out for the process of water entry with different initial speeds and angles. The changes in the structure’s positions, air cavities, and slamming loads are obtained. The rule of slamming pressure with the water entry angle and the relationship between pressure and acceleration are determined.

FE-Simulation in der klinischen Osteoporoseforschung

2013 ◽  
Vol 22 (01) ◽  
pp. 07-12
Author(s):  
P. K. Zysset ◽  
D. H. Pahr
Keyword(s):  
Fe Simulation ◽  
Finite Elemente ◽  
Finite Elemente Methode

ZusammenfassungAltersbedingte Osteoporose erhöht des Frakturrisiko. Übliche Diagnoseverfahren basieren auf DXA. Leider sind diese ungenau und erklären oft nicht die Effekte von Behandlungen. Eine neue Methode zur Bestimmung der Knochenfestigkeit beginnt derzeit, sich zu etablieren – die Finite-Elemente-Methode (FEM). Diese universelle, im Bereich der Technik weit verbreitete, Methode erlaubt es, die Diagnose und den Behandlungserfolg besser vorauszusagen als DXA. CT-basierende FEModelle sind stark von der Bildauflösung abhängig. In diesem Überblicksartikel werden drei unterschiedliche Modelltypen (μCT, HRpQCT, QCT) vorgestellt und die Ergebnisse von densitometrischen und FE-Analysen verglichen. Dabei waren die FE-Ergebnisse den densitometrischen immer überlegen. Darüber hinaus erlaubt die FEM die Angabe eines biomechanischen Frakturrisikos. Dieser Vorteil der FE-Methode muss jedoch im Licht der höheren Röntgendosen und Betriebskosten der CT-Bildgebung betrachtet werden. Zukünftig wird die FE-Methode klinisch eine weite Verbreitung finden – die Frage ist nur wann und wie!

A Finite Element (FE) simulation of naked solid steel beam at elevated temperature

2018 ◽  
Vol 10 (9) ◽  
Author(s):  
Fariz Aswan Ahmad Zakwan ◽  
◽  
Renga Rao Krishnamoorthy ◽  
Azmi Ibrahim ◽  
Ruqayyah Ismail ◽  
...  
Keyword(s):  
Finite Element ◽  
Elevated Temperature ◽  
Fe Simulation ◽  
Steel Beam

Numerical simulation of the effect of waves on cavity dynamics for oblique water entry of a cylinder

2020 ◽  
Vol 32 (6) ◽  
pp. 1178-1190
Author(s):  
Gui-yong Zhang ◽  
Zhao Hou ◽  
Tie-zhi Sun ◽  
Hai-peng Wei ◽  
Ning Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Water Entry
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