Numerical simulation for the coupled problem of temperature and seepage fields in cold region dams

2002 ◽  
Vol 40 (5) ◽  
pp. 631-635 ◽  
Author(s):  
Lai Yuanming ◽  
Liu Songyu ◽  
Wu. Ziwang ◽  
Wu Yaping ◽  
J.M. Konrad
Keyword(s):  
Numerical Simulation ◽  
Cold Region ◽  
Coupled Problem

Study on the Range of Freeze-Thaw of Surrounding Rock from a Cold-Region Tunnel and the Effects of Insulation Material

2011 ◽  
Vol 399-401 ◽  
pp. 2222-2225 ◽  
Author(s):  
Peng Qi ◽  
Jing Zhang ◽  
Zhi Rong Mei ◽  
Yue Xiu Wu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Surrounding Rock ◽  
Insulation Material ◽  
The Finite Element Method ◽  
Cold Region ◽  
Coupled Problem ◽  
Fluid Transfer ◽  
Tunnel Depth ◽  
The Relationship

A mathematical models for the coupled problem is established by considering heat and mass transfer and phase change for rock mass at low temperature, according to the theory of heat and mass transfer for porous media. It is considered of the influences of fluid transfer on the heat conduction and the temperature gradient on the seepage. By adopting the finite element method, the numerical simulation is done to study the range of frost-thaw of surrounding rock and the effects of insulation material in cold regions, which analysis the influence of tunnel depth and surrounding rock class on the range of frost-thaw, the change law of the frost-thaw area of different insulation material and the relationship between the frost-thaw area and the thickness of insulation material.

scholarly journals Numerical Simulation of a Non Linear Coupled Fluid-Structure Problem by Explicit Finite Element-Finite Volume Coupling

2005 ◽  
Author(s):  
Jean-Franc¸ois Sigrist ◽  
Christian Laine ◽  
Bernard Peseux
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Volume ◽  
Industrial Applications ◽  
Inviscid Fluid ◽  
Fluid Structure ◽  
Coupled Problem ◽  
Non Linear ◽  
Structure Problem ◽  
Structure Code

The present paper deals with the numerical simulation of a coupled non linear fluid-structure problem by explicit coupling between a finite element structure code and a finite volume fluid code. This numerical study is carried out in order to develop robust and general coupling with FE and CFD commercial code for industrial applications. A geometrically simple non linear coupled problem is presented in order to validate the numerical approach. The structure non linear problem is solved with a finite element technique, using a iterative implicit algorithm for time integration. The fluid problem is solved using standard numerical techniques (finite volume approach, implicit splitting operator scheme). The whole coupled problem is solved with a commercial CFD code: a dedicated FE structure code is developed in the CFD code together with coupling (in time, in space) procedures. The proposed method is validated in the case of a incompressible inviscid fluid, for which the coupled problem is solved with an analytical solution. The present study gives a reference test case for a full scale fluid-structure model. Industrial applications can now be considered by coupling commercial FE and FV codes with general coupling code.

Numerical Study on Effect of Covered Water in Thawing Frozen Soil by Explosive Load

2013 ◽  
Vol 767 ◽  
pp. 211-216
Author(s):  
Hideki Hamashima ◽  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Kazuyuki Hokamoto ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Numerical Study ◽  
Frozen Soil ◽  
Experimental Result ◽  
Cold Region ◽  
Explosive Load ◽  
Simple Experiment

It is known to be able to expect the improvement of the harvest if the cropping time can be made early in a cold region such as Russia, Norway, Sweden and Hokkaido in Japan. Therefore, for the purpose of making cropping time early as much as possible, we researched the destruction of the frozen soil by the explosive. In the simple experiment, as compared with the experiment which placed the explosive directly on top of the frozen soil, it broke greatly in the experiment which poured out water 20 mm in height after placing an explosive directly on top of the frozen soil. Furthermore, it was found that the thawing time of residual frozen soil in the experiment using water is shorter than without water. In this research, in order to investigate the effect of the covered water in thawing frozen soil by explosive load, the numerical simulation was performed. The result of the numerical simulation was well in agreement with the experimental result, and it was clarified that destruction effect is increased by covering with water.

scholarly journals Flow simulation of a firn-covered cold glacier

1997 ◽  
Vol 24 ◽  
pp. 242-248 ◽  
Author(s):  
Olivier Gagliardini ◽  
Jacques Meyssonnier
Keyword(s):  
Numerical Simulation ◽  
Flow Simulation ◽  
Mass Conservation ◽  
Conservation Equation ◽  
The Finite Element Method ◽  
Density Profiles ◽  
Coupled Problem ◽  
Stationary Conditions ◽  
Mass Conservation Equation

A numerical simulation of the flow of the cold glacier of Dôme du Goûter (4304 m, Mont Blanc, France) is presented. Owing to the large thickness of the firn layer, the simulation was done by using a rheological model for porous ice derived from a model for ceramic sintering and adapted to fit available data on in situ measured density profiles and firn mechanical behaviour. The flow calculation was made under the assumptions of axisymmetric geometry and stationary conditions, by solving a coupled problem. For a given density field, the velocities were obtained by the finite-element method. Then the integration of the mass-conservation equation along the streamlines derived from this velocity field gave the corresponding stationary densities. The results of the numerical simulation, besides the velocity and density fields, are the age of the ice along the streamlines. They are compared with observation and field data.

Numerical Simulation of Thermal Field in Subgrade of Passenger Dedicated Railway Line in Cold Region

2014 ◽  
Vol 971-973 ◽  
pp. 601-604
Author(s):  
Yuan Liu ◽  
Wen Yao Qiu
Keyword(s):  
Numerical Simulation ◽  
Global Warming ◽  
Thermal Field ◽  
Negative Temperature ◽  
Geological Data ◽  
Climate Condition ◽  
Cold Region ◽  
Local Climate ◽  
Railway Line ◽  
Finite Element Software

Based on the background of the subgrade in Dalian of Dalian-Haerbin Passenger Dedicated line and combined the local climate condition and geological data, the thermal field in subgrade was simulated by finite element software, and the distribution of thermal field in subgrade of different month in winter and different years were analyzed. The results indicated that: The main areas of subgrade appeared negative temperature in winter, and the sunward and shady aspect should be considered in the distribution of thermal field in actual analysis. The negative temperature of thermal field in subgrade decreased with the increasing of the years in the same period, and the global warming have a significant effect on the distribution of thermal field.

scholarly journals Validation Test Cases for Multi-Physic Problems: Application to Magneto-Hydrodynamic Numerical Simulations

2008 ◽  
Author(s):  
David Cebron ◽  
Jean-Franois Sigrist ◽  
Vincent Soyer ◽  
Pierre Ferrant
Keyword(s):  
Numerical Simulation ◽  
Test Cases ◽  
The Finite Element Method ◽  
Propulsion Systems ◽  
Validation Test ◽  
The Past ◽  
Coupled Problem ◽  
Promising Tool ◽  
Numerical Tools ◽  
Low Efficiency

The present paper is concerned with the numerical simulation of magneto-hydrodynamic (MHD) problems with industrial tools. MHD has received attention some thirty to twenty years ago as a possible alternative in propulsion applications; MHD propelled ships have even been designed to that purpose. However such propulsion systems have been proved of low efficiency and fundamental researches in the area have progressively received much less attention over the past decades. Numerical simulation of MHD problem could however provide interesting solutions in the field of turbulent flow control. The development of recent efficient numerical techniques for multi-physic applications provide promising tool for the engineer for that purpose. In the present paper, some elementary test cases in laminar flow with magnetic forcing terms are analyzed; equations of the coupled problem are exposed and analytical solutions are derived in each case, highlighting the relevant non-dimensional number which drives the physics of the problem. Several analytical calculations are then proposed and discussed. The present work will serve as basis for validation of numerical tools (based on the finite element method) for academic as well as industrial application purposes.

scholarly journals The Effect of Flow Velocity on Microcantilever-Based Biosensors

2007 ◽  
Vol 23 (4) ◽  
pp. 353-358 ◽  
Author(s):  
M.-C. Wu ◽  
J.-S. Chang ◽  
K.-C. Wu ◽  
C.-H. Lin ◽  
C.-Y. Wu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Flow Velocity ◽  
Cost Efficiency ◽  
Concentration Field ◽  
Microcantilever Sensors ◽  
First Order ◽  
Coupled Problem ◽  
Physical Phenomena ◽  
Microcantilever Beam

ABSTRACTThis work focuses on studying the effect of flow velocity on microcantilever-based biosensor by numerical simulation. The microcantilever sensors used in detecting biomolecules have attractive advantages like cost efficiency, real-time and ability of fabricating in array. Both rectangular and triangular shapes of a general model of microcantilever beam are considered. Several important physical phenomena are obtained. Comparing with the first order Langmuir theory, we have calculated the effect on the reactive rate, produced concentration, the distribution of concentration and deflection in the z axis by solving these physical coupled problem involving flow field, concentration field and chemical reaction on the reaction surface. It is found numerically that the transportation of analyte, reactive rate, the distribution of concentration and deflection in the z axis are all effected by changing the flow velocity. The result has shown that flow velocity is an important factor for this biosensor.

Sign in / Sign up

Export Citation Format

Share Document