338-0521/03 – 3D Fluid Flow (3Dpro)
| Gurantor department | Department of Hydromechanics and Hydraulic Equipment | Credits | 5 |
| Subject guarantor | doc. Ing. Marian Bojko, Ph.D. | Subject version guarantor | doc. Ing. Marian Bojko, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Compulsory |
| Year | 2 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2014/2015 | Year of cancellation | |
| Intended for the faculties | FS | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
In this course, students will learn about the physical importance of turbulence in the flow of real fluids in general three-dimensional geometry. Furthermore, they will learn in detail the creation of computational geometry in the software DesignModeler and SpaceClaim and the creation of a computational grid in the ANSYS Meshing program in the ANSYS software environment. They will also acquire knowledge and skills in designing and defining numerical simulations for solving problems of mixture flow including chemical reactions with heat transfer and radiation, multiphase flow and time-dependent tasks. In addition, they will encounter the problem of flow around of bodies and the flow of solid particles in the form of a discrete phase.
Teaching methods
Lectures
Tutorials
Summary
The course deals with the physical meaning of turbulence and mathematical models of turbulent flow in general three-dimensional geometry. The defined mathematical model is applied to three-dimensional geometries created in DesignModeler and SpaceClaim. Subsequently, a computer grid is generated in ANSYS Meshing. The mathematical model is supplemented by boundary and initial conditions. The theory is applied to examples of gas mixture flow, including consideration of heat source or chemical reaction with heat transfer and radiation. Numerical calculations of multiphase flow and flow around the bodies for stationary and non-stationary tasks will be realized. Also the problems of flow of solid particles in the form of discrete phase, etc. For the solution is applied software product Ansys Fluent, which uses the finite volume method.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
For the credit it is necessary to submit a seminar paper. The maximum number of points for credit is 35, the minimum number of points is 25. Examination: min. 26 points max. 65 points.
E-learning
Other requirements
Students work out a seminar work for which they must obtain a minimum number of points for credit
Exam questions:
1. Methodology of creating geometry (DesignModeler) and mesh in ANSYS Meshing, mesh quality control, possibility to import geometry from other CAD programs.
2. Transfer and its solution, mass transfer, Fourier law of heat transfer, Newton's law of momentum transfer.
3. Mathematical model of turbulence for compressible flow, N-S equation, continuity equation, Reynolds equation, time centering. Fluent turbulent models, k-eps model, RNG model, RSM model, Spalart-Almaras model, k- model.
4. Modeling of mixture flow, species transport equation, physical properties of mixtures and mixtures for compressible and incompressible flow.
5. Characteristics of the mixture source (area, volume).
6. Multiphase models - Euler approach and Lagrange approach.
7. Characteristics of time dependent solution.
8. Boundary conditions, input and output conditions, symmetry conditions, periodic conditions, wall conditions, heat transfer through the wall, definition of non-constant boundary conditions, differences in definition of boundary conditions for compressible and incompressible flow.
9. Problems of combustion of gaseous fuels (models with chemical reaction, model of combustion as a source of heat).
10. Flow around the bodies, boundary layer.
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Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Curriculum
1. Software of DesignModeler. Basic menus and pull-down menu of DesignModeler. Presentation of results of CFD analysis of fuel combustion problems based on presented works published on the Internet.
2. Generating of the 3D geometry in DesignModeler. Tools to edit imported 3D geometry in DesignModeler. Introducing SpaceClaim to create geometry.
3. Software for creation of the computer grid in ANSYS Meshing, methods for generation of grid, 3D elements. Criteria of computer grid quality evaluation, boundary layer types, grid adaptation.
4. Numerical solution of first order differential equations, integral method, finite volume method, simple and simplec methods, interpolation scheme, convergence (residuals, uderrelax). Application of various elements on 3D geometry, evaluation of computer grid quality, creation of different types of boundary layers, export of computer grid to ANSYS Fluent.
5. Physical properties, mass transfer (Fick's law), conduction heat transfer (Fourier's law), mass and momentum transfer (convection), convection and conduction heat transfer.
6. Types of boundary conditions for compressible and incompressible flow. Definition of physical properties of gaseous mixture (constant, functional dependence on temperature, kinetic theory of gas) and mixtures, characteristics of terms: concentration, mass fraction, volume fraction.
7. Turbulence, compressible flow, N-S equation, continuity equation, Reynolds equation and rules, time averaging, Boussinesq hypothesis.
8. Energy equations for incompressible and compressible flow, heat transfer through the wall (thin wall), heat transfer through the wall of real thickness (SOLID), types of boundary conditions for walls, modeling near the wall, wall functions.
9. Transport equations for mass fractions, definition of diffusion flux and source term due to chemical reaction, definition of mixture and calculation of physical properties of mixture.
10. Flow of gases with chemical reaction and heat transfer and radiation, energy equation, models of combustion of gaseous phases, definition of kinetics of combustion process using Arhenius equation (pre-exponential factor, activation energy).
11. Flow with solid particles and drops, trajectory, definition of discrete phase, interaction with continuous phase, phase change, mathematical modeling of solid particles combustion.
12. Multiphase flow, characteristics of mathematical models VOF, Mixture, Euler, definition of individual phases, definition of cavitation by multiphase mathematical model, physical properties of phases.
13. Mathematical approaches to combustion of solid fuels, problems of defining a mathematical model of lump wood combustion in fireplace stoves, mathematical modeling of low-temperature coal oxidation.
14. Solving the problems of pulverized coal combustion in the fall tube, evaluation of mathematical approaches and comparison with the experiment.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction