scholarly journals QUASI-3D MODELLING OF SURF ZONE DYNAMICS

2011 ◽  
Vol 1 (32) ◽  
pp. 52
Author(s):  
Arjen Luijendijk ◽  
Johan Henrotte ◽  
Dirk Jan Walstra ◽  
Maarten Van Ormondt
Keyword(s):  
Flow Model ◽  
Surf Zone ◽  
Three Dimensional ◽  
3D Modelling ◽  
Dimensional Model ◽  
Computationally Efficient ◽  
Three Dimensional Model ◽  
3D Effects ◽  
The Vertical Distribution ◽  
Three Dimensional Simulations

A quasi-three-dimensional model (quasi-3D) has been developed through the implementation of an analytical 1DV flow model in existing depth-averaged shallow water equations. The model includes the effects of waves and wind on the vertical distribution of the horizontal velocities. Comparisons with data from both physical and field cases show that the quasi-3D approach is able to combine the effect of vertical structures with the efficiency of depth-averaged simulations. Inter-comparisons with three-dimensional simulations show that the quasi-3D approach can represent similar velocity profiles in the surf zone. Quasi-3D morphodynamic simulations show that the bed dynamics in the surf zone represent the relevant 3D effects in the surf zone much more than the depth-averaged computations. It was shown that the quasi-3D approach is computationally efficient as it only adds about 15-20% to the runtimes of a 2DH simulation which is minor compared to a run time increase of 250-800% when switching to a 3D simulation.

scholarly journals Three-dimensional simulations of the expanding remnant of SN 1987A

2013 ◽  
Vol 9 (S296) ◽  
pp. 330-331
Author(s):  
Toby Potter ◽  
Lister Staveley-Smith ◽  
John Kirk ◽  
Brian Reville ◽  
Geoff Bicknell ◽  
...  
Keyword(s):  
Particle Acceleration ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Sn 1987A ◽  
The One ◽  
Shock Fronts ◽  
Three Dimensional Simulations ◽  
Gas Properties

AbstractSNR 1987A is the expanding remnant from the brightest supernova since the invention of the telescope. The remnant has been monitored extensively in the radio at variety of wavelengths and provides a wealth of data on which to base a simulation. Questions to be answered include estimating the efficiency of particle acceleration at shock fronts, determining the cause of the one-sided radio morphology for SNR 1987A and investigating the gas properties of the pre-supernova environment. We attempt to address these questions using a fully three-dimensional model of SNR 1987A.

Evaluating 3-D and 1-D mathematical models for mass transport in heterogeneous biofilms

2000 ◽  
Vol 41 (4-5) ◽  
pp. 347-356 ◽  
Author(s):  
E. Morgenroth ◽  
H. Eberl ◽  
M.C. van Loosdrecht
Keyword(s):  
Three Dimensional ◽  
Average Concentration ◽  
Local Concentration ◽  
Concentration Profiles ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
One Dimensional ◽  
Bacterial Competition ◽  
Variable Diffusion ◽  
Three Dimensional Simulations

Results from a three dimensional model for heterogeneous biofilms including the numerical solution of hydrodynamics were compared to simplified one dimensional models. A one dimensional model with a variable diffusion coefficient over the thickness of the biofilm was well suited to approximate average concentration profiles of three dimensional simulations of rough biofilms. A new compartmentalized one dimensional model is presented that is then used to evaluate effects of pores and channels on microbial competition in heterogeneous biofilms. Surface and pore regions of the biofilm are modeled using separate compartments coupled by a convective link. Local concentration profiles from the three dimensional simulations could be adequately reproduced using the compartmentalized one dimensional model. The compartmentalized one dimensional model was then used to evaluate bacterial competition in a growing biofilm and in a mushroom type biofilm assuming different modes of detachment.

MATHEMATICAL AND NUMERICAL ANALYSIS OF A THREE-DIMENSIONAL FLUID FLOW MODEL IN GLACIOLOGY

2005 ◽  
Vol 15 (01) ◽  
pp. 37-52 ◽  
Author(s):  
JACQUES RAPPAZ ◽  
ADRIAN REIST
Keyword(s):  
Flow Model ◽  
Numerical Solutions ◽  
Three Dimensional ◽  
Ice Sheets ◽  
Tetrahedral Mesh ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Piecewise Polynomial Functions ◽  
Theoretical Results

The main goal of this article is to analyze a three-dimensional model for stress and velocity fields in grounded glaciers and ice sheets including the role of normal deviatoric stress gradients. This model leads to a nonlinear system of stationary partial differential equations for the velocity with a viscosity depending on the stress–tensor but which is not explicitly depending on the velocity. The existence and uniqueness of a weak solution corresponding to this model is established by using the calculus of variations. The approximation of this model is made by a finite element method with piecewise polynomial functions of degree 1 on a tetrahedral mesh and error analysis is performed. Numerical solutions show that the theoretical results we have obtained are almost optimal.

Model 3D in Service of Preservation, Restoration, Structural Analyses of the Architectural Heritage

2017 ◽  
pp. 563-589
Author(s):  
Elena Teresa Clotilde Marchis
Keyword(s):  
Cultural Heritage ◽  
Three Dimensional ◽  
3D Modelling ◽  
Dimensional Model ◽  
Architectural Heritage ◽  
Three Dimensional Model ◽  
Practical Applications ◽  
Final Output ◽  
Methodological Guidelines ◽  
The Way

This contribute aims to explore 3D modelling and its practical applications investigating scales of representation and scales of contents from architecture to landscape. The goal of this approach is to test the flexibility of modelling tools to different fields of application and to draw shared methods, even if they are applied in so different context. Changing the scale, is obvious, the language changes – because it is necessary to recompose symbolic and iconographic elements – themes and scales of representation change. So is possible to pave the way to strictly disciplinary thinking on outcomes and on instrumental and methodological guidelines for further research. The topic focuses on developing guidelines and creating a simple three-dimensional model designed to represent both the complexity of the “cultural heritage” morphology, as well as the need to manage the process of restoration in all its phases: from first findings to the restored final output.

Model 3D in Service of Preservation, Restoration, Structural Analyses of the Architectural Heritage

2019 ◽  
pp. 177-205
Author(s):  
Elena Teresa Clotilde Marchis
Keyword(s):  
Cultural Heritage ◽  
Three Dimensional ◽  
3D Modelling ◽  
Dimensional Model ◽  
Architectural Heritage ◽  
Three Dimensional Model ◽  
Practical Applications ◽  
Final Output ◽  
Methodological Guidelines ◽  
The Way

This contribute aims to explore 3D modelling and its practical applications investigating scales of representation and scales of contents from architecture to landscape. The goal of this approach is to test the flexibility of modelling tools to different fields of application and to draw shared methods, even if they are applied in so different context. Changing the scale, is obvious, the language changes – because it is necessary to recompose symbolic and iconographic elements – themes and scales of representation change. So is possible to pave the way to strictly disciplinary thinking on outcomes and on instrumental and methodological guidelines for further research. The topic focuses on developing guidelines and creating a simple three-dimensional model designed to represent both the complexity of the “cultural heritage” morphology, as well as the need to manage the process of restoration in all its phases: from first findings to the restored final output.

Three-Dimensional Model for Virtual Surgical Simulation, during Complex Skull Base Surgery and Aneurysm Surgery

Skull Base ◽  
2008 ◽  
Vol 18 (S 01) ◽  
Author(s):  
Akio Morita ◽  
Toshikazu Kimura ◽  
Shigeo Sora ◽  
Kengo Nishimura ◽  
Hisayuki Sugiyama ◽  
...  
Keyword(s):  
Skull Base ◽  
Surgical Simulation ◽  
Skull Base Surgery ◽  
Three Dimensional ◽  
Aneurysm Surgery ◽  
Dimensional Model ◽  
Three Dimensional Model
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