APPLIED COMPUTATIONAL FLUID DYNAMICS
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- Versione italiana
- Academic year
- 2021/2022
- Teacher
- ALESSIO SUMAN
- Credits
- 6
- Didactic period
- Secondo Semestre
- SSD
- ING-IND/08
Training objectives
- The module " APPLIED COMPUTATIONAL FLUID DYNAMICS", of the integrated course of " NUMERICAL THERMO-FLUID DYNAMICS + APPLIED COMPUTATIONAL FLUID DYNAMICS", aims to provide the tools for the use, management, and application of projects based on computational fluid dynamics (CFD), with particular attention to topics concerning machines and energy systems. The module will aim to apply the theories and models studied in the "NUMERICAL THERMO-FLUID DYNAMICS" module, combining their use with actual applications. Expected Learning Results (AAR) are: - the ability to manage a numerical simulation process from the generation of the geometry to obtaining qualitatively adequate results; - knowledge of numerical methodologies of thermos-fluid dynamics analysis and design applied to machines, energy systems, and heat exchange devices; - the ability to properly apply numerical models and methods related to computational thermo-fluid dynamics; - ability to critically interpret the results obtained from the numerical simulation; - the ability to recap and summarize the results obtained in a project and to propose solutions for the optimization of the analyzed devices.
Prerequisites
- Knowledge of Numerical Thermo-fluid dynamics
Basic knowledge of Fluid Dynamics of Machines
Basic knowledge of three-dimensional solid modeling is recommended. Course programme
- Conservation equations: continuity, momentum, energy. Equations of state. Boundary layer. Rotational and irrotational flows. (5 h)
Introduction to applied CFD. The process of managing a CFD simulation: data flow chart and details. (2.5 h)
Geometry. Generation and importation. Cleaning: concepts of dirty geometry, defeaturing, repairing, subtraction. (2.5 h)
Mesh. Type, topology, characteristics, quality. Structured and unstructured grids and generation criteria. Mesh morphing and moving grid methodologies. Management of the boundary layer. Mesh sensitivity analysis (Grid Convergence Index). (5 h)
Pre-processing. The solution models. Turbulence and turbulence models. Wall functions. The relation between mesh and turbulence models. Multi-phase models: Eulerian-Eulerian (VOF), Eulerian-Lagrangian (Balance of forces). Heat exchange models: Conjugate Heat transfer, Natural Convection, Radiation models. Porous models. (7.5 h)
The setting of the boundary conditions (BC): positioning, types, and parameters of calculation, BC fluid dynamics, BC of the turbulence, BC of the heat exchange. Interfaces (GGI). (2.5 h)
Solver. reference to the resolution schemes (First-Order (Upwind) and Second-Order). Convergence criteria. Residues on conservation equations. Monitoring points and global parameters. (2.5 h)
Transient simulation: approaches and solutions. (2.5 h)
Post-processing. Flow filed analysis. Views: streamline, vector plot, contour plot, iso-surfaces. Recall to media operations. Calculation of integral parameters. (5 h)
Computer-assisted exercise. Development of a complete CFD verification project for a machine or an energy system. (25 h) Didactic methods
- The module is equally divided between lectures and lab exercises (hands-on lessons). The laboratory exercise will include the development of an assisted CFD project until full autonomy is achieved.
Learning assessment procedures
- The check consists of taking an interview of about 30 minutes which will focus on the evaluation of the management capacity of a numerical simulation process and the ability to interpret the results obtained by numerical simulations. During the check, it will be necessary to demonstrate knowledge of the methods of use and some specific commands of the fluid dynamics simulation software used during the lessons. In line with the module "NUMERICAL THERMO-FLUID DYNAMICS", questions will also be asked questions to check the consistency with what is exposed concerning the numerical simulations to verify the knowledge of numerical analysis methods and techniques by relating the theories and models of numerical thermos-fluid dynamics and their application in the analysis of actual systems and machines.
Reference texts
- Slide of the lessons.
Tutorial of the laboratory exercise (hands-on lessons).
Comini, Croce, Nobile - Fondamenti di Termofluidodinamica computazionale.
Çengel, Cimbala. Fluid Mechanics: Fundamentals and Applications
