A Multiscale DEM-VOF Method for the simulation of three-phase flows

Slosh-induced hydrodynamic force in a water tank with multiple baffles

This study provides evidence supporting the use of the update strategies for the support vector regression (SVR) model. Firstly, the fitting and interpolation method (FIM) is presented to select SVR parameters, and three infill strategies are adopted to search for update points. Secondly, the infill strategy and parameter selection method are illustrated by test functions that illustrate their dependability. The distribution of update points, the sample density and the proportion of update points are discussed. Finally, the adaptive SVR surrogate model is applied to optimize the protective effect of railway wind barriers. The result shows that the parameter selection method has high stability. On the whole, the accuracy of the adaptive SVR model using a suitable infill strategy will be improved with an increasing proportion of update points if the final number of training points is identical. The optimization result shows an optimal porosity of 0.117 when the height of the railway wind barrier is 2.05 m (full scale).

An adaptive surrogate model based on support vector regression and its application to the optimization of railway wind barriers

Effects of wind barrier on the safety of vehicles driven on bridges

Recent natural disasters, such as the 2004 Indian Ocean and 2011 Tohoku Tsunami, exhibited the importance of tsunami resistant infrastructure in high-risk coastal areas. The failure of critical infrastructure in tsunami-stricken communities has led to a recent emphasis on extreme loading conditions associated with tsunami events. One of the critical loads identified by previous research was debris loads. Debris is defined as solid objects entrained within the inundating flows and can range from construction materials to shipping vessels. The emphasis of tsunami loading has led to recent progression in the understanding of debris loads and effects, particularly in evaluating the impact of a single debris piece on a structure. The following paper reviews state-of-the-art research in tsunami-driven debris motion and loads and identifies future directions of research into debris loads and effects to aid in the design of tsunami-resistant infrastructure.

/pdf/tsunami-driven-debris-motion-and-loads-a-critical-review-12koil5wb2.pdf

Tsunami-Driven Debris Motion and Loads: A Critical Review

Windbreak protection for road vehicles against crosswind

A two-way coupled simulation of moving solids in free-surface flows

In this paper, we present a two-way coupled moving solid algorithm with discrete element method (DEM) to simulate dynamic fluid-solid interaction. This model allows obstacles moving in the multi-phase fluids to generate realistic motion for both the fluids and obstacles. We discretize the NavierStokes equation using finite volume method (FVM) for the fluid part. The volume-of-fluid (VOF) method is used to track the fluid-fluid and fluid-solid interfaces. This algorithm is useful in the fields of Engineering and Earth Sciences, such as structure collapse and landslide generated tsunamis. Examples of landslide tsunami and floating cubes are demonstrated using the algorithm.

/pdf/dynamic-coupling-of-multi-phase-fluids-with-a-moving-4nahj2nzlg.pdf

Chih Jung Huang

Papers

Windbreak protection for road vehicles against crosswind

A two-way coupled simulation of moving solids in free-surface flows

Dynamic coupling of multi-phase fluids with a moving obstacle

The 1:20 scaled hydraulic model test and field experiment of barge-type floating offshore wind turbine system

Interaction analysis of 3D multiphase fluids and deformable bodies