scholarly journals A two-dimensional finite-element study of flow in the transition zone between an ice sheet and an ice shelf

1994 ◽  
Vol 20 ◽  
pp. 67-72 ◽  
Author(s):  
Renaud Lestringant
Keyword(s):  
Finite Element ◽  
Transition Zone ◽  
Stokes Equations ◽  
Numerical Study ◽  
Ice Sheet ◽  
Two Dimensional ◽  
Ice Shelf ◽  
Sharp Transition ◽  
Transition Zones ◽  
Dimensional Finite Element

A numerical study has been carried out on the flow of ice in the transition zone between an ice sheet and an ice shelf. The study was motivated by the need for global ice-sheet-ice-shelf modelling to determine the characteristics of the transition zone. The problem is dealt with from an academic viewpoint, and the study especially focuses on two-dimensional vertical sharp transition zones. Stokes equations are solved using a finite-element method. Conclusions include: (1) in ice-sheet-ice-shelf modelling, each of the two components can be computed separately then linked by a jump-boundary condition [or the horizontal velocity; (2) as shown by studies on the response of an ice shelf to tidal forcing, the surface elevation/thickness ratio passes through the hydrostatic equilibrium value.

scholarly journals A two-dimensional finite-element study of flow in the transition zone between an ice sheet and an ice shelf

1994 ◽  
Vol 20 ◽  
pp. 67-72 ◽  
Author(s):  
Renaud Lestringant
Keyword(s):  
Finite Element ◽  
Transition Zone ◽  
Stokes Equations ◽  
Numerical Study ◽  
Ice Sheet ◽  
Two Dimensional ◽  
Ice Shelf ◽  
Sharp Transition ◽  
Transition Zones ◽  
Dimensional Finite Element

A numerical study has been carried out on the flow of ice in the transition zone between an ice sheet and an ice shelf. The study was motivated by the need for global ice-sheet-ice-shelf modelling to determine the characteristics of the transition zone. The problem is dealt with from an academic viewpoint, and the study especially focuses on two-dimensional vertical sharp transition zones. Stokes equations are solved using a finite-element method. Conclusions include: (1) in ice-sheet-ice-shelf modelling, each of the two components can be computed separately then linked by a jump-boundary condition [or the horizontal velocity; (2) as shown by studies on the response of an ice shelf to tidal forcing, the surface elevation/thickness ratio passes through the hydrostatic equilibrium value.

Étude de la réouverture de la lagune du Havre aux Basques. I. Modélisation numérique des conditions d'écoulement

1995 ◽  
Vol 22 (1) ◽  
pp. 55-71
Author(s):  
Y. Ouellet ◽  
A. Khelifa ◽  
J.-F. Bellemare
Keyword(s):  
Finite Element ◽  
Numerical Study ◽  
Element Model ◽  
Two Dimensional ◽  
Flow Conditions ◽  
Modélisation Numérique ◽  
Tidal Flows ◽  
Dimensional Finite Element ◽  
The Stability ◽  
La Madeleine

A numerical study based on a two-dimensional finite element model has been conducted to analyze flow conditions associated with different possible designs for the reopening of Havre aux Basques lagoon, located in Îles de la Madeleine, in the middle of the Gulf of St. Lawrence. More specifically, the study has been done to better define the depth and geometry of the future channel as well as its orientation with regard to tidal flows within the inlet and the lagoon. Results obtained from the model have been compared and analyzed to put forward some recommendations about choice of a design insuring the stability of the inlet with tidal flows. Key words: numerical model, finite element, lagoon, reopening, Havre aux Basques, Îles de la Madeleine.

Ice-stream-ice-shelf transition: theoretical analysis of two-dimensional flow

2000 ◽  
Vol 30 ◽  
pp. 153-162 ◽  
Author(s):  
Alexander V. Wilchinsky ◽  
Vladimir A. Chugunov
Keyword(s):  
Shear Stress ◽  
Transition Zone ◽  
Stokes Equations ◽  
Stress Deviator ◽  
Two Dimensional ◽  
Ice Shelf ◽  
Full System ◽  
Ice Stream ◽  
Grounding Line ◽  
Two Dimensional Flow

AbstractTwo-dimensional steady isothermal flow of a marine ice stream is studied. Gases of different relations between shear stress and longitudinal deviatoric stress in the ice stream are considered. Analysis of the ice-stream-ice-shelf transition zone shows that even if the longitudinal stress deviator in the ice stream is much larger than the shear stress (as it is in the ice shelf), the ice-stream-ice-shelf transition zone if singular and the full system of Stokes equations must be solved in it. Scales of fields in the transition zone and the relation between the ice thickness and the horizontal mass flux at the grounding line are found.

scholarly journals Numerical simulation of potato slices drying using a two-dimensional finite element model

2017 ◽  
Vol 23 (3) ◽  
pp. 431-440 ◽  
Author(s):  
Mohsen Beigi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Moisture Transfer ◽  
Numerical Study ◽  
Element Model ◽  
Moisture Diffusivity ◽  
Two Dimensional ◽  
Dimensional Finite Element ◽  
Drying Curves ◽  
Potato Slices

An experimental and numerical study was conducted to investigate the process of potato slices drying. For simulating the moisture transfer in the samples and predict the dehydration curves, a two-dimensional finite element model was developed and programmed in Compaq Visual Fortran, version 6.5. The model solved the Fick?s second law for slab in a shrinkage system to calculate the unsteady two-dimensional moisture transmission in rectangular coordinates (x,y). Moisture diffusivity and moisture transfer coefficient were determined by minimizing the sum squares of residuals between experimental and numerical predicted data. Shrinkage kinetics of the potato slices during dehydration was determined experimentally and found to be a linear function of removed moisture. The determined parameters were used in the mathematical model. The predicted moisture content values were compared to the experimental data and the validation results demonstrated that the dynamic drying curves were predicted by the methodology very well.

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