Fluid-solid Coupling Effect Research Articles

Consolidation Modeling of Geomaterials Susceptible to Damage

The mechanical behaviour of fluid saturated poroelastic geomaterials that have a greater susceptibility for damage is of considerable interest in many civil and geotechnical engineering applications. This paper examines the problem of consolidation response of a damage-susceptible poroelastic geomaterials. In this study, the concept of effective stress of damaged porous media and the modified Darcy’s law is developed firstly from the point of view of the continuum damage mechanics, which is considered to be a novel development in the application of damage mechanics to the study of poroelastic phenomena. Then, a numerical damage model based on FEM considering fluid-solid coupling effect is established and applied to analyze the Biot’s consolidation problem of damaged soils. The comparison between the numerical predictions and the experimental data shows that the numerical damage model presented in this paper is effective and feasible in analyzing the consolidation problem of damaged porous media.

Numerical simulation of mechanical breakup of river ice-cover

Ice jams and ice dams in rivers will cause significant rises of water levels. Under extreme conditions, the ice flooding during winter or early spring may occur. In this paper, by considering the fluid-solid coupling effect caused by the water and the ice cover, the mechanisms of the mechanical breakup of the river ice cover are studied. A formula is obtained for determining whether or not the mechanical breakup process would happen under the hydraulic pressure of the flow. Combined with the hydraulic model under the ice covered flow, a numerical model is built and the interaction between the discharge, the hydraulic pressure under the ice cover and the date for the mechanical breakup of the river ice cover is simulated. The simulated results of the dates for the mechanical breakup of the river ice cover agree very well with the field observations of the breakups of the river ice cover in the Hequ Reach of the Yellow River. Therefore, the numerical model might serve as a good preliminary step in studying the breakup of the river ice-cover, evidencing many important parameters that affect the ice-cover process.

Finite element simulation for fluid–solid coupling effect on depressurization-induced gas production from gas hydrate reservoirs

Natural gas production from hydrate reservoirs is a physical and chemical seepage process of multiphase and multicomponent in nonisothermal condition. A gas–water two-phase hydro-mechanically coupled model is established to simulate the complex performance of depressurization-induced gas production from hydrate reservoirs. The model considers the heat conduction and convection, the variation of physical and mechanical properties as a result of hydrate dissociation, and the interaction between fluid seepage in porous and rock skeleton deformation. With the finite element approximation technique, a coupled simulator is developed. Case studies of gas production from hydrate reservoirs by depressurization are presented, and the fluid–solid coupling effect is mainly discussed.The results show that the overall fluid–solid coupling effect reduces the depressurization-induced gas production from hydrate reservoirs. The rock skeleton deformation can shrink reservoir porosity and increase the elastic drive energy, which favors to enhance gas production to some extent. In contrast, the permeability and porosity reduction due to sandstone deformation can lead to the decrease of gas production significantly. The physical properties variation in the fluid–solid coupling effect has a major impact on gas production of hydrate reservoirs. The fluid–solid coupling effect is a key factor worthy of close attention in the exploitation of hydrate reservoirs.

Parametric and Controllable Shape Model of the Water-Lubricated Rubber Journal Bearing

This paper describes a general bearing profile for the water-lubricated rubber journal bearing. Characteristics of the most popular water-lubricated rubber journal bearing, the straight fluted bearing, were deeply analyzed. The bearing profile was expressed using subsection function and a parametric and controllable shape model was built. By adjusting the parameters of the shape model, the existing bearing profiles can be integrated into the shape model and some bran-new bearing profile can be generated from the model. The rigid film thickness equation was achieved using the shape model and the relationship between the load capacity and the parameters of the shape model was established with the neglecting of elastic deformation effect. It is seen that the dimensionless load capacity reduces with the increase of the transition arc radius, the flute radius and the number of flutes,. The Necessity of the research on the bearing profile and the correctness of the shape model are validated. The parametric and controllable shape model is the foundation to study the fluid-solid coupling effect and to carry out the multi-disciplinary cooperating optimization for the water-lubricated rubber journal bearing.

Parametric and Controllable Shape Model of the Water-Lubricated Rubber Journal Bearing

This paper describes a general bearing profile for the water-lubricated rubber journal bearing. Characteristics of the most popular water-lubricated rubber journal bearing, the straight fluted bearing, were deeply analyzed. The bearing profile was expressed using subsection function and a parametric and controllable shape model was built. By adjusting the parameters of the shape model, the existing bearing profiles can be integrated into the shape model and some bran-new bearing profile can be generated from the model. The rigid film thickness equation was achieved using the shape model and the relationship between the load capacity and the parameters of the shape model was established with the neglecting of elastic deformation effect. It is seen that the dimensionless load capacity reduces with the increase of the transition arc radius, the flute radius and the number of flutes,. The Necessity of the research on the bearing profile and the correctness of the shape model are validated. The parametric and controllable shape model is the foundation to study the fluid-solid coupling effect and to carry out the multi-disciplinary cooperating optimization for the water-lubricated rubber journal bearing.

Numerical Analysis of Fluid-Structure Interaction of Frame Structure Considering the Impact of Turbulent Wind Load

According to the basic principle of CFD simulation and methods, a framework structure was studied for its vortex-induced vibration and control principle of around the flow field, it revealed the characteristics of vortex-induced vibration and rules, systematically studied frame structure fluid-solid coupling effect and the flow field active control methods and mechanism. Results provide the theory basis for the frame structure around the flow field and the wind induced vibration effect.

A Study of the Fluid-Solid Coupling Effect of Tight Gas Reservoir

A Study of the Fluid-Solid Coupling Effect of Tight Gas Reservoir