Relaxation-time limit of the three-dimensional hydrodynamic model with boundary effects

2011 ◽  
Vol 34 (10) ◽  
pp. 1202-1210 ◽  
Author(s):  
Yeping Li
Keyword(s):  
Relaxation Time ◽  
Hydrodynamic Model ◽  
Three Dimensional ◽  
Time Limit ◽  
Boundary Effects

Relaxation-Time Limit in the Isothermal Hydrodynamic Model for Semiconductors

2009 ◽  
Vol 40 (5) ◽  
pp. 1979-1991 ◽  
Author(s):  
Jiang Xu
Keyword(s):  
Relaxation Time ◽  
Hydrodynamic Model ◽  
Time Limit

scholarly journals Relaxation-time limit of the multidimensional bipolar hydrodynamic model in Besov space

2011 ◽  
Vol 251 (11) ◽  
pp. 3143-3162 ◽  
Author(s):  
Yeping Li ◽  
Ting Zhang
Keyword(s):  
Relaxation Time ◽  
Besov Space ◽  
Hydrodynamic Model ◽  
Time Limit ◽  
Bipolar Hydrodynamic Model

To the theory analysis of tightness of tank of pressure testing

2019 ◽  
Vol 5 (4) ◽  
pp. 129-142
Author(s):  
Vladislav Sh. Shagapov ◽  
Ismagilyan G. Khusainov ◽  
Emiliya V. Galiakbarova ◽  
Zulfya R. Khakimova
Keyword(s):  
Relaxation Time ◽  
Three Dimensional ◽  
Petroleum Products ◽  
Technical Condition ◽  
Excess Pressure ◽  
Soil Parameters ◽  
Theory Analysis ◽  
Pressure Testing ◽  
Tank Pressure ◽  
Over Time

This article studies the process of relaxation of the pressure in a tank with the damaged area of the wall after pressure-testing. The authors use different methods for the diagnosis of the technical condition of objects of petroleum products storage. Pressure testing is one of nondestructive methods. The rate of pressure decrease is characteristic of the system tightness. This article studies the cases of ground and underground location of the tank. Pressure testing involves excess pressure inside of a tank and observing its decrease. Over time, one can assess the integrity of the system. This has required creating mathematical models to account the filtration of the liquid depending on the location of the tank. The results include the analytical solution of the task and the formulas for describing the dependence of the relaxation time of pressure in the tank from the liquid and soil parameters, geometry of the tank, and the damaged portion of the wall. The two- and three-dimensional cases of liquids filtration for the case of underground location of the tank were considered. The results of some numerical calculations of the dependence of reduction time and the time of half-life pressure from the area of the damaged portion of the wall were shown. The obtained solutions allow assessing the extent of the damaged area by the pressure testing with known values of tank, liquid, and soil.

scholarly journals Application of a three-dimensional hydrodynamic model for San Quintin Bay, B.C., Mexico. Validation and calibration using OpenDA

2015 ◽  
Vol 273 ◽  
pp. 428-437 ◽  
Author(s):  
Mariangel Garcia ◽  
Isabel Ramirez ◽  
Martin Verlaan ◽  
Jose Castillo
Keyword(s):  
Hydrodynamic Model ◽  
Three Dimensional

scholarly journals On Computational Modelling Of Strain-Hardening Material Dynamics

2012 ◽  
Vol 11 (5) ◽  
pp. 1525-1546 ◽  
Author(s):  
Philip Barton ◽  
Evgeniy Romenski
Keyword(s):  
Relaxation Time ◽  
Stress Relaxation ◽  
Plastic Strain ◽  
Strain Hardening ◽  
Three Dimensional ◽  
Computational Modelling ◽  
Constitutive Models ◽  
Successful Implementation ◽  
Hardening Material ◽  
Dislocation Mechanics

AbstractIn this paper we show that entropy can be used within a functional for the stress relaxation time of solid materials to parametrise finite viscoplastic strain-hardening deformations. Through doing so the classical empirical recovery of a suitable irreversible scalar measure of work-hardening from the three-dimensional state parameters is avoided. The success of the proposed approach centres on determination of a rate-independent relation between plastic strain and entropy, which is found to be suitably simplistic such to not add any significant complexity to the final model. The result is sufficiently general to be used in combination with existing constitutive models for inelastic deformations parametrised by one-dimensional plastic strain provided the constitutive models are thermodynamically consistent. Here a model for the tangential stress relaxation time based upon established dislocation mechanics theory is calibrated for OFHC copper and subsequently integrated within a two-dimensional moving-mesh scheme. We address some of the numerical challenges that are faced in order to ensure successful implementation of the proposedmodel within a hydrocode. The approach is demonstrated through simulations of flyer-plate and cylinder impacts.

Modeling residence time with a three-dimensional hydrodynamic model: Linkage with chlorophyll a in a subtropical estuary

2013 ◽  
Vol 268 ◽  
pp. 93-102 ◽  
Author(s):  
Yongshan Wan ◽  
Chelsea Qiu ◽  
Peter Doering ◽  
Mayra Ashton ◽  
Detong Sun ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Residence Time ◽  
Hydrodynamic Model ◽  
Three Dimensional ◽  
Subtropical Estuary

Three-dimensional hydrodynamic model of concrete tetrahedral frame revetments

2009 ◽  
Vol 8 (4) ◽  
pp. 338-342 ◽  
Author(s):  
Zhu Gao ◽  
Xing Li ◽  
Hong-wu Tang ◽  
Zheng-hua Gu
Keyword(s):  
Hydrodynamic Model ◽  
Three Dimensional

Modeling of collapsing cavitation bubble near solid wall by 3D pseudopotential multi-relaxation-time lattice Boltzmann method

2017 ◽  
Vol 232 (3) ◽  
pp. 445-456 ◽  
Author(s):  
Minglei Shan ◽  
Yu Yang ◽  
Hao Peng ◽  
Qingbang Han ◽  
Changping Zhu
Keyword(s):  
Relaxation Time ◽  
Lattice Boltzmann ◽  
Cavitation Bubble ◽  
Solid Wall ◽  
Three Dimensional ◽  
Lattice Boltzmann Model ◽  
Bubble Collapse ◽  
Lattice Boltzmann Simulation ◽  
Boltzmann Method ◽  
Boltzmann Model

Understanding the dynamic characteristic of the cavitation bubble near a solid wall is a fundamental issue for the bubble collapse application and prevention. In the present work, an improved three-dimensional multi-relaxation-time pseudopotential lattice Boltzmann model is adopted to investigate the cavitation bubble collapse near the solid wall. With respect to thermodynamic consistency, Laplace law verification, the three-dimensional pseudopotential multi-relaxation-time lattice Boltzmann model is investigated. By the theoretical analysis, it is proved that the model can be regarded as a solver of the Rayleigh–Plesset equation, and confirmed by comparing the results of the lattice Boltzmann simulation and the Rayleigh–Plesset equation calculation for the case of cavitation bubble collapse in the infinite medium field. The bubble collapse near the solid wall is modeled using the improved pseudopotential multi-relaxation-time lattice Boltzmann model. We find the lattice Boltzmann simulation and the experimental results have the same dynamic process by comparing the bubble profiles evolution. Form the pressure field and the velocity field evolution it is found that the tapered higher pressure region formed near the top of the bubble is a crucial driving force inducing the bubble collapse. This exploratory research demonstrates that the lattice Boltzmann method is an alternative tool for the study of the interaction between collapsing cavitation bubble and matter.

Three-dimensional hydrodynamic model for wind-driven circulation

2018 ◽  
Vol 40 (2) ◽  
Author(s):  
C. L. N. Cunha ◽  
A. C. Scudelari ◽  
P. C. C. Rosman
Keyword(s):  
Hydrodynamic Model ◽  
Three Dimensional ◽  
Wind Driven Circulation
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