Numerical study on spatially varying bottom friction coefficient of a 2D tidal model with adjoint method

2006 ◽  
Vol 26 (16) ◽  
pp. 1905-1923 ◽  
Author(s):  
Xianqing Lu ◽  
Jicai Zhang
Keyword(s):  
Friction Coefficient ◽  
Adjoint Method ◽  
Numerical Study ◽  
Bottom Friction ◽  
Tidal Model ◽  
Spatially Varying

scholarly journals Estimation of Bottom Friction Coefficients Based on an Isopycnic-Coordinate Internal Tidal Model with Adjoint Method

2013 ◽  
Vol 2013 ◽  
pp. 1-11
Author(s):  
Yanqiu Gao ◽  
Anzhou Cao ◽  
Haibo Chen ◽  
Xianqing Lv
Keyword(s):  
Adjoint Method ◽  
Bottom Friction ◽  
Conical Surface ◽  
Friction Coefficients ◽  
Tidal Model ◽  
Good Ability ◽  
Point Scheme ◽  
Group 3 ◽  
Group 2 ◽  
Spatially Varying

Based on an isopycnic-coordinate internal tidal model with the adjoint method, three groups of ideal experiments are carried out in order to investigate the estimation of spatially varying bottom friction coefficients (BFCs). In group 1, five values of distance between independent points (DIP) are used to invert the BFCs with the distribution of conical surface. Results show that the BFCs can be inverted successfully with independent point scheme and the strategy with a DIP of 50′ can yield the best results. In group 2, five values of interpolation radius (IR) are used to invert the BFCs with the distribution of conical surface. Results show that the strategy with an IR of 1.9 times of DIP can yield the best results. Based on the results of the first two groups, group 3 adopts the optimal DIP and IR to estimate 4 kinds of spatially varying BFCs. The results indicate that the isopycnic-coordinate internal tidal model with the adjoint method has a good ability to estimate the spatially varying BFCs; the inversion results of the BFCs with the distribution of revolution paraboloid are better than those with the distribution of conical surface.

scholarly journals A Study on Bottom Friction Coefficient in the Bohai, Yellow, and East China Sea

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Daosheng Wang ◽  
Qiang Liu ◽  
Xianqing Lv
Keyword(s):  
Friction Coefficient ◽  
Data Assimilation ◽  
East China Sea ◽  
Bottom Friction ◽  
East China ◽  
Altimeter Data ◽  
Empirical Formulas ◽  
China Sea ◽  
Dependent Form ◽  
Spatially Varying

The adjoint tidal model based on the theory of inverse problem has been applied to investigate the effect of bottom friction coefficient (BFC) on the tidal simulation. Using different schemes of BFC containing the constant, different constant in different subdomain, depth-dependent form, and spatial distribution obtained from data assimilation, the M2constituent in the Bohai, Yellow, and East China Sea (BYECS) is simulated by assimilating TOPEX/Poseidon altimeter data, respectively. The simulated result with spatially varying BFC obtained from data assimilation is better than others. Results and analysis of BFC in BYECS indicate that spatially varying BFC obtained from data assimilation is the best fitted one; meanwhile it could improve the accuracy in the simulation of M2constituent. Through the analysis of the best fitted one, new empirical formulas of BFC in BYECS are developed with which the commendable simulated results of M2constituent in BYECS are obtained.

PRELIMINARY STUDY ON NOVEL BEAM-TO-COLUMN CONNECTION BASED ON SMA PLATE

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Michael CH Yam ◽  
Ke Ke ◽  
Ping Zhang ◽  
Qingyang Zhao
Keyword(s):  
Friction Coefficient ◽  
Energy Dissipation ◽  
Numerical Study ◽  
Numerical Models ◽  
Numerical Technique ◽  
The Self ◽  
Hysteretic Behavior ◽  
The Novel ◽  
Energy Dissipation Capacity ◽  
Preliminary Study

A novel beam-to-column connection equipped with shape memory alloy (SMA) plates has been proposed to realize resilient performance under low-to-medium seismic actions. In this conference paper, the detailed 3D numerical technique calibrated by the previous paper is adopted to examine the hysteretic behavior of the novel connection. A parametric study covering a reasonable range of parameters including the thickness of the SMA plate, friction coefficient between SMA plate and beam flange and pre-load of the bolt was carried out and the influence of the parameters was characterized. In addition, the effect of the SMA Belleville washer on the connection performance was also studied. The results of the numerical study showed that the initial connection stiffness and the energy-dissipation capacity of the novel connection can be enhanced with the increase of the thickness of the SMA plate. In addition, the initial connection stiffness and energy-dissipation behavior of the novel connection can be improved by increasing the friction coefficient or pre-load of bolts, whereas the increased friction level could compromise the self-centering behavior of the connection. The hysteretic curves of the numerical models of the connection also implied that the SMA washers may contribute to optimizing the connection behavior by increasing the connection stiffness and energy-dissipation capacity without sacrificing the self-centering behavior.

Hydrodynamic Tidal Model of the Persian Gulf Based on Spatially Variable Bed Friction Coefficient

2018 ◽  
Vol 42 (1) ◽  
pp. 25-45
Author(s):  
Mostafa Sohrabi Athar ◽  
Alireza A. Ardalan ◽  
Roohollah Karimi
Keyword(s):  
Friction Coefficient ◽  
Persian Gulf ◽  
Tidal Model ◽  
The Persian Gulf ◽  
Bed Friction
Sign in / Sign up

Export Citation Format

Share Document