This study aims to conduct a sensitivity analysis of closure models and modeling parameters for the Dense Discrete Phase modeling(DDPM)approach in order to investigate the hydrodynamics of a 3D lab-scale Tapered Fluid...
详细信息
This study aims to conduct a sensitivity analysis of closure models and modeling parameters for the Dense Discrete Phase modeling(DDPM)approach in order to investigate the hydrodynamics of a 3D lab-scale Tapered Fluidized Bed(TFB).The closure models and model parameters under investigation include the gas-solid drag force,viscous models,particle-particle interaction models,restitution coefficient,specularity coefficient,and rebound *** primary objective of this sensitivity analysis is to optimize the numerical model's *** numerical results,in terms of axial and lateral Solid Volume Fraction(SVF)profiles obtained from the sensitivity analysis,indicate that the drag force and restitution coefficient significantly influence the hydrodynamics of the *** selecting these parameters could result in the improved performance of the numerical ***,the sensitivity of turbulence models,particle-particle interaction models,specularity coefficient,and rebound coefficient has a lesser impact on the hydrodynamics *** work concludes with the recommendation of a set of closure models and modeling parameters that offer the most accurate prediction of the hydrodynamics of the TFB.
Reinforced concrete (RC) shear walls connected by coupling beams form an efficient structural system for tall buildings to resist earthquake loads. Understanding the load-deformation characteristics of coupling beams ...
详细信息
Reinforced concrete (RC) shear walls connected by coupling beams form an efficient structural system for tall buildings to resist earthquake loads. Understanding the load-deformation characteristics of coupling beams is essential to modeling the overall system responses of coupled walls to seismic loading. Using new test data presented in a companion paper, modeling studies are performed to evaluate the effectiveness of current modeling approaches with respect to key parameters, including effective elastic stiffness, deformation capacity, and residual strength. modeling approaches commonly employed in engineering practice are investigated and are shown to reasonably capture measured force-versus-deformation behavior. The impact of the test specimen scale factor is reviewed and shown to be potentially significant on the member effective bending stiffness and deformation capacity. The modeling studies are expanded to include beam aspect ratios not considered in the test program to develop modeling parameters for use in seismic rehabilitation and performance-based seismic design.
The non-linear performances of RC beam specimens under flexure are evaluated with constant % of Thermo Mechanically Treated (TMT) reinforcement in confined and unconfined conditions by pushover and cyclic loading. The...
详细信息
The non-linear performances of RC beam specimens under flexure are evaluated with constant % of Thermo Mechanically Treated (TMT) reinforcement in confined and unconfined conditions by pushover and cyclic loading. The pushover and cyclic behavior of the beam specimens is plotted in the form of load-deformation for determining the non-linear modeling parameters as per ASCE/SEI 41-06. The beam specimens under cyclic testing have shown large yield strength but low ductility as compared to pushover testing. It may be concluded that the ductility, which is synonymously used without the relevance either of monotonic or cyclic load of a component or a structure, may result to be lethal if appropriation is neglected in behavior factor in seismic design. The confining of transverse reinforcement is another significant parameter on which the post-yield force-deformation relationship and the resulting ductility of an RC component depend. (C) 2015 The Institution of Structural Engineers. Published by Elsevier Ltd. All rights reserved.
This work proposes a transformer structure with high -coupling, and small chip area characteristics using current silicon-based technology. The proposed device has tight coupling (k = 0.92), and minimum chip area (O.D...
详细信息
ISBN:
(纸本)9782960055160
This work proposes a transformer structure with high -coupling, and small chip area characteristics using current silicon-based technology. The proposed device has tight coupling (k = 0.92), and minimum chip area (O.D. = 140 mu m) characteristics. In order to understand this device operation in high frequency, an equivalent circuit is developed to extract the model parameters. Base on the proposed transformer in this work, this device will be helpful in designing RF integrated circuits for system-on-a-chip applications.
Analyzing service behavior is useful activity for monitoring and comparing cloud services. modeling behavior of a cloud service is required by various cloud providers and researchers to analyze the usage pattern of se...
详细信息
ISBN:
(纸本)9781479933587
Analyzing service behavior is useful activity for monitoring and comparing cloud services. modeling behavior of a cloud service is required by various cloud providers and researchers to analyze the usage pattern of service. This can be used to identify failure rate, success rate, and shortcomings of a service. It can also be used to formulate new business strategies and overcome the pitfalls. We are analyzing the behavior of a cloud service to determine the various parameters. These parameters are then can be used to provide trust value, in terms of strength of a cloud service. Also a provider can make use of this to identify the improvement areas for the cloud service and application.
Petrophysical model is mainly used to combine the matrix, fluid and pore in certain mode. Therefore, many modeling parameters are involved but the simple and effective control methods are insufficient. The matrix of m...
详细信息
Petrophysical model is mainly used to combine the matrix, fluid and pore in certain mode. Therefore, many modeling parameters are involved but the simple and effective control methods are insufficient. The matrix of model is simplified to reduce the influence of polymineral parameters on model frame. The velocity of longitudinal wave is introduced. In addition, the common petrophysical model is divided into velocity control model and modulus control model. The accurate modeling parameters can be obtained through mutual relations among different types of model parameters, thus increasing the efficiency of horizontal wave prediction. The length-width ratio of pore varies with well through the ratio classification technology at the effect of compaction to effectively increase the identification capacity of elastic parameters on fluid and lithology.
Failure of beam-column connections can lead to partial and complete building collapse during severe earthquakes. Corner beam-column connections may be more vulnerable during earthquakes because they must withstand bid...
详细信息
Failure of beam-column connections can lead to partial and complete building collapse during severe earthquakes. Corner beam-column connections may be more vulnerable during earthquakes because they must withstand bidirectional loading transferred from nearby beams and columns. Furthermore, horizontal torsion exacerbates the damage to corner beam-column connections compared with other components. The objective of this study is to explore the seismic performance of corner beam-column connections in reinforced concrete intermediate moment frames (IMFs) and special moment frames (SMFs). Four full-scale beam-column connection specimens are fabricated and tested under two different loading types (unidirectional and bidirectional loading). It is observed that the strength and deformation capacity of the specimens were strongly affected by the type of loading (unidirectional and bidirectional lateral loading) and the reinforcement details (SMF, IMF). All corner connection specimens failed by joint shear failure irrespective of loading type and reinforcement detail.
A detailed parametric sensitivity analysis reveals the effect on the numerically calculated profile factor of ultrasonic flow meters of various modeling parameters such as mesh refinement, boundary conditions, turbule...
详细信息
A detailed parametric sensitivity analysis reveals the effect on the numerically calculated profile factor of ultrasonic flow meters of various modeling parameters such as mesh refinement, boundary conditions, turbulence model, wall treatment, interpolation schemes and numerical integration. The flow field is solved using a commercial CFD code and the profile factor is obtained by numerical integration of the three velocity components along the acoustic path. Interesting relations of these numerical parameters concerning the inertia of the flow are observed, suggesting that the higher the Reynolds number, the more precaution is needed in the simulation of pipe flows, especially when the goal is to infer the profile factor of ultrasonic flow measurements, which are related to strict uncertainties. The main finding is that quantitative conclusions may be mistaken or distorted if a proper analysis of how sensitive the simulation results are with respect to its modeling parameters is not carried out.
暂无评论