Error message
User error : Failed to connect to memcache server: druportbe01:11211 in dmemcache_object() (line 415 of /production/drupal/dim_prod/drupal/d7cl4/prod/unich/releases/7/web/sites/all/modules/contrib/memcache/dmemcache.inc ).
COMPUTATIONAL MODELING FOR ENVIRONMENTAL SYSTEMS Single discipline educational activity
Course Sheet Academic Year of enrolment:
Professor and Collaborators:
Hours of classroom activity:
Prerequisites:
Prerequisites: Knowledge of basic mathematics and physics applied to Engineering and the Environment System; propaedeutic are not foreseen.
Objectives
Contents Content: Computer programs are fundamental tools in all activities that require quantitative answers, in particular for environmental systems. Their use presupposes the knowledge of all the characteristics of the system of interest and of the phenomenologies to be studied (Mathematics, Physics, Chemistry, Mechanics). However, the implemented models are only an interpretation of reality. Therefore, for their correct use, it is necessary to know the characteristics of the main mathematical models, their numerical realization and the conditions so that they can provide useful information. The course describes the fundamental bases on which the main computational models used were developed to study environmental phenomenologies, such as seismics, geophysics, transport and diffusion of substances, river dynamics, filtration, debris-flow, consolidation , thermofluidynamics (CFD), the interaction of the built environment with environmental systems. Therefore the following are studied: Basic mathematical and physical tools of Computational Modeling - Differential Equations; General form of the balance equation of scalar, vector and tensor quantities and equations derived from it by means of experimental laws - Navier Stokes CFD equations - Notes on analytical solution methods of the main ordinary and partial differential equations relating to Environmental Computational Modeling - General problem of Sturm_Liouville and series development of orthogonal Fourier functions - Notes on the Transformation Method - Interpolation of numerical data - Elements of statistics and probability calculation - Processing of observation data with linear and non-linear regression - General principles of analysis and numerical calculation - Methods of numerical solution of partial differential equations in time and space (FEM, FDM, SPH, PFEM) - Solution of linear and nonlinear systems (general concepts and definitions) - Examples of modeling and numerical computation - Examples of routines in MATLAB and in FORTRAN95 language.
Extended Syllabus Full detailed program:
1. Basic tools of Computational Modeling. Types of quantities used - Cartesian, cylindrical and spherical orthogonal coordinates - Change of coordinates: "Jacobian" - Elements of matrix calculus (eigenvalues, eigenvectors, hints on tensors, rigid rototranslations, matrices as operators, inversion of matrices and LU Theorem) - Elements of analytic geometry (conic as quadratic forms) - Derivatives: "substantial", Eulerians and Lagrangians, physical meaning of partial and total derivative with respect to time, derivative with respect to time of a vector, Poisson formulas, derivative of an integral, notes on fractional derivatives (anomalous diffusion) - Introduction to differential operators (gradient, divergence, rotor and their physical meaning, Green-Gauss and Stokes' theorems, Symbolic calculus) - Notable functions (Gamma; Dirac; Heaviside; derivatives of discontinuous functions) - Inertial, non-inertial reference systems.
2. Differential equations. General definitions - Ordinary differential equations - Partial differential equations - Application notes on the stability of differential equations and on the Mathematical Theory of Stability of Dynamic Systems - Notes on the onset of deterministic chaos also in climatology (Lorentz equations, Strange attractors) - Notes on the Principles of Minimum and Elements of Variation Calculus - Example of vibrating bar.
3. General form of the balance equation of scalar, vector and tensor quantities and equations derived from it by means of experimental laws. Diffusion of a substance in a moving and non-moving medium (Fick's laws, advection), with transport of pollutants, sediments - heat exchange by conduction and convection - wave equation - discrete model and continuous model (notes on the propagation of seismic perturbations) - infiltration of water and air in unsaturated soil (Richards, Fokker-Plank) - Notes on the Biot Consolidation Law - Notes on the "debris flow" equations, using the Shallow Water model - Notes on wave interaction electromagnetic with matter (Georadar).
4. Navier Stokes equations. Equations in dimensionless form (Buckingham's theorem and emergence of "Dimensional Numbers" Reynolds, Froude, Rayleigh, Grashov) - Dynamic Reynolds equation - Conservation of mass, of momentum; energy; notes on turbulence and models for its treatment.
5. Notes on the methods of analytical solution of the main ordinary and partial differential equations relating to Environmental Computational Modeling. Initial and boundary conditions - Meaning and utility of the series development of functions: introductory concepts on Hilbert Spaces as formal basis for the use of series expansion of orthogonal functions (Fourier expansion) - Method of Variable Separation, with examples : (diffusion; forced oscillations of discrete systems seismic and electromagnetic waves, vibration of a one-dimensional bar, Consolidation and conductive heat exchange equation).
6. General problem of Sturm_Liouville and series expansions of Fourier orthogonal functions. Some examples - Expansion of the solutions in eigenfunctions with the relative eigenvalues.
7. Notes on the Transformation Method. Fourier and Laplace.
8. Interpolation of numerical data. Lagrange, Hermite, Spline polynomial.
9. Elements of statistics and probability calculus. Chebyshev's inequality - Notes on the theory of errors and the problem of experimental measurement - Notes on the Probability Calculus and the main statistical distributions - Test of a statistical hypothesis with examples.
10. Processing of observation data with linear and non-linear regression. Least squares methods - Fourier analysis with applications - Numerical data analysis using the FFT (Fast Fourier Transform) method - Time Domain and Frequency Domain analysis - Outline of stochastic investigation with the Monte-Carlo approach.
11. General principles of analysis and numerical calculation. Evaluation of truncation and rounding errors and their propagation.
12. Methods of numerical solution of partial differential equations in time and space. Newmark and Bathe's approach - Notes on Smoothed Particles Hydrodynamics (SPH) - Finite Element Method: FEM - Notes on the Finite Element Method (PFEM) - Notes on the Finite Difference Method (FDM) - Meshatura Delaunay and Voronoy.
13. Solution of linear and non-linear systems (general concepts and definitions). Conjugate Gradient and Cholesky Method - Solution of nonlinear systems (Newton Rapshon and United Point Method).
14. Examples of modeling and numerical computation. Problems carried out by the finite element method (F.E.M.): pollution of a marsh in stationary conditions
15. Examples of routines in MATLAB and FORTRAN95 language.
Recommended Bibliography Reference Text: Course-pack, slides, scientific articles indicated and distributed by the teacher. Furthermore the following texts with advanced discussion: Gambolati G.-Elementi di Calcolo Numerico – Edizioni Libreria Cortina – Padova 1992. Tichonov A. N., Samarskij A. A. - Equazioni della Fisica Matematica - Edizioni Mir 1981. Dettman John W. – Mathematical Methods in Physics and Engineering – Dover Publications, Inc. 1988. Graffi Dario - Elementi di Meccanica Razionale - Casa Editrice Patròn Bologna 1970. Kahn Peter B. - Mathematical Methods for Scientists &Engineers (Linear and Nonlinear Systems) - John Wiley &Sons 1990. Strang Gilbert - Introduction to Applied Mathematics - Wellesley-Cambridge Press (M.I.T.) 1986.
Methods of Provision
Teaching Methods Teaching methods: Classroom lectures, with active involvement of students in order to encourage curiosity and spirit of investigation; exercises.
Evaluation methods Verification of learning:
Modality of learning proof: Written and oral exam. The written test consists of exercises and open questions. The oral exam consists in the discussion of the written test with extension on the whole program. The final grade will include the evaluation of the written test plus the oral test, but not as an arithmetic average, but as a global vote
Contacts/More Information Other information: The days of students reception are fixed. Additional appointments are foreseen after agreement.