OVERVIEW

Computational Fluid Dynamics (CFD) is becoming more and more attractive in the marine industry, as a complementary tool to usual model and full scale measurements. A deep knowledge of the theoretical basis of each approach, their limitations, the applicability fields and the quality of the results is, consequently, fundamentaal for the successfull application of these approaches to the design and analysis problems typical of naval architecture.

AIMS AND CONTENT

LEARNING OUTCOMES

Introduction to the approaches (theoretical basis and numerical implementations) for the numerical solution of the typical problems related to the Naval Architecture (propulsion, hull resistance, cavitation). Development of simple numerical tools and application of high-fidelity solvers (RANSE) in order to identify their applicability to design problems, possible limitations and fields of applicability.

AIMS AND LEARNING OUTCOMES

The aim of the course is to provide a theoretical and practical knowledge of the principal aspects related to the application of numerical techniques to hydrodynamic (and in particular to Naval Architecture) in order to:

• Have an overview of the most important approaches (and of their limitations), like BEM and RANSE, for the solution of problems of interest in Naval Architecture (Propeller performance, Free surafce flows, Hull resistance), with a brief introduction on their fundamental equations and the most suitable discretization strategies;
• Understand the application limits of the available numerical approaches and critically be able to discuss them;

By:

• Development of simple numerical codes based on the potential flow theories illustrated during the course (2D potential flow solvers for thin profile theory, BEM using Hess&Smith for hydrofoil, 3D lifting line) using Matlab (or C++, FORTRAN, depending on the experience of the students);
• Training with StarCCM+ for the solution of the viscous flow using the RANSE approximation of the continuity and momentum equations around geometries of interest (simple 2D problems, like hydrofoils, 3D wings and rudders, Propellers, multiphase fluids)

TEACHING METHODS

Oral lessons (abt. 35 hours) and computer lab (25-30 hours).

SYLLABUS/CONTENT

• Brief overview of Fluid Mechanics Equations;
• Potential flow approaches, theoretical basis and numerical implementation using Matlab, or FORTRAN or C++ of:
  • Thin profile theory
  • 3D Lifting line
  • 3D Lifting Surface
  • BEM usig Hess & Smith for 2d Hydrofoils
• RANSE approaches, including the relevant theory, discretization apporaches, meshes, single and multiphase problems by training with StarCCM+ for the solution of:
  • Hydrofoil in steady and unsteady conditions; Stall;
  • von Karman Vortexes;
  • Mesh motions
  • Free Surface Flows (2D roll motion, free fall of a wedge on a free surface, hydrofoil under the free surface)
  • 3D wings and rudders, tip vortex
  • Propellers in steady flow

RECOMMENDED READING/BIBLIOGRAPHY

J. Katz & A. Plotkin, "Low Speed Aerodynamics - From wing theory to panel method", McGraw-Hill

J.H. Ferziger & M. Peric, "Computational Methods for Fluid Dynamics", Springer

TEACHERS AND EXAM BOARD

LESSONS

LESSONS START

https://corsi.unige.it/8738/p/studenti-orario

Class schedule

The timetable for this course is available here: Portale EasyAcademy

EXAMS

EXAM DESCRIPTION

Oral talk with presentation of the results of a home assignment.

ASSESSMENT METHODS

With the presentation of the results and the discussion of the outcomes of the home assignments, with the identification of applicability fields, of possible different formulation of the problem and of limitations of the developed/applied numerical approach, the critical thinking of the student, together with the competences and the mastery on the subjects learned during lessons will be evaluated. The final grade is based on the ability to describe, autonomously, with appropriate terms and with critical thinking, the topics illustrated during lessons and developed during the home assignments.