Chao Huang

High performance numerical simulation center

A liquid bridge between two neighboring particles is commonly observed in nature and various industrial processes. An accurate prediction of the profile of a liquid bridge is significantly important in particulate flows, while it is an analytically challenging task as well. In this paper, we develop an asymptotic solution for a catenoid liquid brid...

In order to understand the protective mechanism of helmet against shock wave, a head model under far-field blast is investigated experimentally and numerically. The distribution of overpressure on the surface of the head model are obtained and compared. The numerical simulations are carried out using the Multi-Material Arbitrary Lagrangian Eulerian...

The interaction between rebar and concrete must always be considered to well describe and predict the mechanical behavior of reinforced concrete (RC) structures. A common way to model RC structures is by discrete reinforcements in finite element models where the discrete reinforcements imply that bond conditions between rebar and concrete are perfe...

The detonation position and the shape of the explosive have a significant influence on the pressure of the underwater explosion shock wave, which makes it possible to use a small charge to form a shock wave that is equivalent to a large charge in a local direction. A charge design method to adjust the amplitude and duration of shock wave pressure w...

Blast-induced traumatic brain injury (bTBI) is a prevalent consequence of modern warfare and explosion hazards. In recent years, mild primary brain injury caused by blast waves has become the predominant form of injury, garnering significant attention from researchers. Due to ethical and technical limitations, human testing is challenging to conduc...

An analysis method of normalized pressure–impulse (P-I) diagrams related to the ductility ratio of structural components is proposed, to quickly estimate the dynamic response of high-strength reinforcement concrete (RC) beams subjected to long-duration blast loading. Firstly, the overall bending deformation mode of RC beams is uncovered via explosi...

In this study, a new cell‐centered Lagrangian discontinuous Galerkin (DG) scheme is presented to simulate gas‐water compressible flows. The two‐phase flows are governed by the compressible Euler equation with ideal and stiffened gas equations of state. We integrate the Lagrangian DG scheme with the exact gas‐water Riemann solver for calculating the...

In order to estimate the underwater explosion shock wave pressure of slender cone-shaped charges and study the characteristic of long duration shock waves, an engineering model based on the superposition principle was proposed. Cone-shaped charges are usually used to simulate the far-field shock wave of large equivalent explosives, and the wave str...

With frequent blast accidents of hundreds of tons equivalent explosion, increasing attention has been paid to the damage assessment and anti-explosion safety of building structures. Some evaluation methods give procedures to obtain the pressure-impulse diagrams on the structural components. However, to the best knowledge of authors, how to evaluate...

Composites are considered as effective materials in absorbing the energy of blast and impact, and have been often used in complex loading environments. A numerical model is developed to analyze the response and damage of S-2 glass/SC-15 epoxy composite laminate subjected to combined loadings with blast and fragments. A composite progressive failure...

Water-entry of object is a type of fluid-structure interaction problem with complex physics, which has a wide range of engineering applications. During the water-entry process, as the object passes the water-air interface, the possible air entrapment may form cavity under specific conditions and the dynamic movement of cavity can generate a jet poi...

Numerical and experimental methods are combined in this paper to study the bubble dynamics generated by an underwater charge explosion with different initial charge shape, detonating styles and boundary conditions. Outdoor experiments are carried out to employ sunlight with the assistant of lamplight to get clearer pictures of bubble motion. The re...

To investigate the shock wave propagation and the bubble motion of underwater explosion from a bottom charge, principle experiments of underwater explosion were conducted in a water tank. High-speed cameras were used to capture the gas bubble formation and collapse, and pressure transducers to record pressure time histories at several locations. Co...

Underwater explosion detonated by column charge can generate exceedingly high-pressure shock wave, bubble pulsing and high-speed jet formed by bubble. Its physical course involves many complicated problems such as transient state, high temperature and high pressure, large distortion and multi-medium flow. For this reason, axisymmetric Smoothed Part...

In order to study the damage effect of ship structure subjected to jet impacting, characteristic of jet loading was investigated theoretically and numerically. A jet impact-model was verified based on a ship cabin model underwater explosion test. An analysis was made by combining the calculation results and test data. Results show that the jet impa...

Experiment and simulation of cylindrical charge underwater explosion bubble motion has been conducted to investigate the collapse mechanism of non-spherical bubble and the behavior of its jet. The experimental results were compared against the numerical results for different configurations of charge. Results show that jet generated by a non-spheric...

In order to research the effects of different grounds on the shock wave propagation and the general laws of the bubble motion of underwater explosion from a bottom charge, principle experiments of underwater explosion were conducted in a water tank. Several physical phenomena observed such as bubble jetting and bubble migration from the different g...

Liquid jets formed when bubbles caused by underwater explosion collapse could seriously threaten the local strength of warships. In order to study the damage effect of vessel structure subjected to bubble jet, a series of underwater explosion trials were performed by using a typical cabin model. Water pressure, bubble pulsating cycle, the dynamic s...

In order to study the dynamic behavior of underwater explosion bubble by a cylindrical charge, a numerical approach was established by combining a finite element model with a boundary element model. Then, the bubble's dynamic motion was calculated by adopting this numerical model. The calculation results coincide with the high-speed photography dat...

Oscillation images of underwater explosion bubbles generated by cylindrical PETN with length to diameter ratio from 3.35 to 6.75 are conducted in a water tank by using high-speed photography technology. Bubble shape evolution is investigated by involving real detonation processes and Rayleigh-Plesset function. Results show that the initial bubble h...

Underwater explosion experiments were carried out for PETN cylinders in a water tank and elementary data about bubble motions under free-field conditions were obtained by using the high-speed photography technology. Results show that the bubble dynamics of cylindrical charges differs from those of spherical ones, and charge mounting modes affect ma...

Underwater explosion bubbles do severe damage to warship structures, and the particularity of underwater explosion and the quality of water bring great difficulties to get a clear picture. So lots of laboratories all around the world make use of discharge or laser to generate bubbles to replace real underwater explosion experiments. Based on the de...

To understand the blast-resistance of steel sandwich plate, the dynamic responses of both original steel plate and steel sandwich plate with the same mass subjected to proximity underwater explosion loading were simulated with finite element method. The calculation results accord with the experimental phenomena. The study results indicate that the...

This paper aims to probe into the feasibility of sound radiation simulation of underwater structure based on ABAQUS. ABAQUS is used to compute and analyze the underwater sound radiation rule of double cylindrical shell structure. And the computation data are in agreement with the experimental data basically. The result indicates that ABAQUS is appr...