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Turbulence

Type of study Follow-up Master
Language of instruction Czech
Code 338-0527/02
Abbreviation Turbu
Course title Turbulence
Credits 3
Coordinating department Department of Hydromechanics and Hydraulic Equipment
Course coordinator doc. Ing. Marian Bojko, Ph.D.

Subject syllabus

1. Introduction, numerical modeling of fluid flow - various commercial systems, ANSYS, types of tasks in the program ANSYS
2. Coordinate system, the Navier-Stokes equations (laminar flow), counting rules, examples, flow in tube, creation of geometry in the ANSYS Workbench, principle of creation computational area and modification of geometry, creation of computational grid, process in creation grid. Demonstration of grid.
3. The physical meaning of turbulence, methods of of modification geometry and creation of grid on real geometry created in CAD. Mathematical models of turbulence, the N-S equation, continuity equation,
4. Reynolds stress, time averaging, Reynolds rules, Boussinesq 's hypothesis, two equation turbulence model.
5. CFD model of flow in a sudden extension of cross-flow, laminar flow regime. import of grid, compatible grids.
6. Transfer of mass, momentum and heat, conduction and convection in heat transfer, determination of thermal power, thermal gradient, heat transfer coefficient, Nusselt number.
7. Integration of the finite volume method for one-dimensional continuity equation and momentum equations, an iterative cycle, the interpolation scheme, convergence (residuals), the definition of species-multiphase model, the cavitation model, combustion model, model of thermal radiation, definition of chemical reaction.
8. Determination of pressure loss in the sudden expansion, the model testing the effect of turbulence on value of loss factor. Defining the boundary conditions function, measured data. Export data from the postprocessor, data analysis in EXCEL.
9. Boundary conditions, conditions of input and exit, conditions of symmetry, periodic conditions, conditions on the wall, the wall heat transfer, time-dependent task. Methods of solving discretized equations, LGS solver, multigrid.
10. Overview of turbulence models available in CFX, the zero-equational model, k- model, RNG k- model, the RSM model, the LES models, SAS, DES. Optimal choice of model, field of use of turbulence models.
11. Flow of real fluids, the law of conservation of mass, momentum and energy for compressible flow, supersonic flow, shock waves.
12. Co- and counterflow heat exchangers of types water-water or water-air. Specify individual seminar works and discussion.
13. The flow of solid particles and drops, the species and their definitions. Definition of tension and buoyancy drops coefficient - solid particles.
14. Special settings in CFX, multidomain simulation, paralel calculations. Integration of CFX in Workbench, the general procedure for the design and calculation of machine.

E-learning

no

Literature

INCROPERA, F., P. ET AL. Fundamentals of heat and mass transfer. 6th ed.. Hoboken : Wiley, c2007 – xxv. 997 s. ISBN 0-471-45728-0 .

SHAUGHNESSY, E. J., KATZ, I. M., SCHAFFER, J. P. INTRODUCTION TO FLUID MECHANICS. New York: Oxford University Press, Inc. 2005. p. 1018.

ANSYS Fluent Theory Guide (Release 18.2). 2017.

Doporučená literatura

RODI, W., FUEYO, N. Engineering Turbulence Modelling and Experiments 5. First edition. Oxford: ELSEVIER SCIENCE Ltd. 2002. p. 1010. ISBN 0-08-044114-9.

ANSYS Fluent Tutorial Guide (Release 18.2). 2017.

ANSYS Fluent User’s Guide (Release 18.2). 2017.