The perforated caisson is widely applied to practical engineering because of its great advantages in effectively wave energy consumption and cost reduction. The attentions of many scientists were paid to the fluid–st...The perforated caisson is widely applied to practical engineering because of its great advantages in effectively wave energy consumption and cost reduction. The attentions of many scientists were paid to the fluid–structure interaction between wave and perforated caisson studies, but until now, most concerns have been put on theoretical analysis and experimental model set up. In this paper, interaction between the wave and the partial perforated caisson in a 2D numerical wave flume is investigated by means of the renewed SPH algorithm, and the mathematical equations are in the form of SPH numerical approximation based on Navier–Stokes equations. The validity of the SPH mathematical method is examined and the simulated results are compared with the results of theoretical models, meanwhile the complex hydrodynamic characteristics when the water particles flow in or out of a wave absorbing chamber are analyzed and the wave pressure distribution of the perforated caisson is also addressed here. The relationship between the ratio of total horizontal force acting on caisson under regular waves and its influence factors is examined. The data show that the numerical calculation of the ratio of total horizontal force meets the empirical regression equation very well. The simulations of SPH about the wave nonlinearity and breaking are briefly depicted in the paper, suggesting that the advantages and great potentiality of the SPH method is significant compared with traditional methods.展开更多
The total uplift forces of waves acting on horizontal plates are theimportant basis for the design of maritime hollow-trussed structures. In this paper, an experimentalstudy on the total uplift forces of waves on hori...The total uplift forces of waves acting on horizontal plates are theimportant basis for the design of maritime hollow-trussed structures. In this paper, an experimentalstudy on the total uplift forces of waves on horizontal plates was conducted by a series of modeltests. The results show that the maximum total uplift forces do not necessarily occur with themaximum impact pressure intensity synchronously. On the basis of the test results, formationmechanism of the total uplift forces of waves as well as its influencing factors were analyzed indetail, and an equation for calculation of the maximum total uplift forces of waves on plates wasput forward. Lots of test data shows the present equation is in good agreement with the testresults.展开更多
The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect...The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect of fluid and nonlinear action of waves onstructures, the VOF (Volume Of Fluid) method combined with the k-ε turbulence model was used tosimulate the interaction between waves and structures. Governing equations were solved with thefinite difference method. Through 2D experimental study in the wave flume, the empiricalrelationship between the reflection coefficient of perforated caissons and the main affectingfactors were obtained from the experimental data using the least square method. Also the correlationbetween the ratio of the total horizontal force acting on perforated caisson and the force actingon solid caisson and the main affecting factors were regressed from the experimental data.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51179030)
文摘The perforated caisson is widely applied to practical engineering because of its great advantages in effectively wave energy consumption and cost reduction. The attentions of many scientists were paid to the fluid–structure interaction between wave and perforated caisson studies, but until now, most concerns have been put on theoretical analysis and experimental model set up. In this paper, interaction between the wave and the partial perforated caisson in a 2D numerical wave flume is investigated by means of the renewed SPH algorithm, and the mathematical equations are in the form of SPH numerical approximation based on Navier–Stokes equations. The validity of the SPH mathematical method is examined and the simulated results are compared with the results of theoretical models, meanwhile the complex hydrodynamic characteristics when the water particles flow in or out of a wave absorbing chamber are analyzed and the wave pressure distribution of the perforated caisson is also addressed here. The relationship between the ratio of total horizontal force acting on caisson under regular waves and its influence factors is examined. The data show that the numerical calculation of the ratio of total horizontal force meets the empirical regression equation very well. The simulations of SPH about the wave nonlinearity and breaking are briefly depicted in the paper, suggesting that the advantages and great potentiality of the SPH method is significant compared with traditional methods.
文摘The total uplift forces of waves acting on horizontal plates are theimportant basis for the design of maritime hollow-trussed structures. In this paper, an experimentalstudy on the total uplift forces of waves on horizontal plates was conducted by a series of modeltests. The results show that the maximum total uplift forces do not necessarily occur with themaximum impact pressure intensity synchronously. On the basis of the test results, formationmechanism of the total uplift forces of waves as well as its influencing factors were analyzed indetail, and an equation for calculation of the maximum total uplift forces of waves on plates wasput forward. Lots of test data shows the present equation is in good agreement with the testresults.
文摘The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect of fluid and nonlinear action of waves onstructures, the VOF (Volume Of Fluid) method combined with the k-ε turbulence model was used tosimulate the interaction between waves and structures. Governing equations were solved with thefinite difference method. Through 2D experimental study in the wave flume, the empiricalrelationship between the reflection coefficient of perforated caissons and the main affectingfactors were obtained from the experimental data using the least square method. Also the correlationbetween the ratio of the total horizontal force acting on perforated caisson and the force actingon solid caisson and the main affecting factors were regressed from the experimental data.
