CODE 84419 2022/2023 6 cfu anno 2 INGEGNERIA NAVALE 8738 (LM-34) - GENOVA ING-IND/01 Italian (English on demand) GENOVA 2° Semester AULAWEB

## 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

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.

AIM of the COURSE:

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)

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:
• 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

### 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:
• 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

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

### Exam Board

STEFANO GAGGERO (President)

GIULIANO VERNENGO

DIEGO VILLA (President Substitute)

## LESSONS

### LESSONS START

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

### Class schedule

L'orario di tutti gli insegnamenti è consultabile all'indirizzo EasyAcademy.

## EXAMS

### EXAM DESCRIPTION

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

### ASSESSMENT METHODS

Wirh the presentation of the results and the discussion of the outcomes of the home assigments, 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 subjetcs learned during lessons will be avaluated.

### Exam schedule

Data Ora Luogo Degree type Note
10/01/2023 09:00 GENOVA Orale
10/01/2023 09:00 GENOVA Esame su appuntamento
24/01/2023 09:00 GENOVA Orale
24/01/2023 09:00 GENOVA Esame su appuntamento
13/02/2023 09:00 GENOVA Orale
13/02/2023 09:00 GENOVA Esame su appuntamento
01/06/2023 09:00 GENOVA Orale
01/06/2023 09:00 GENOVA Esame su appuntamento
29/06/2023 09:00 GENOVA Esame su appuntamento
29/06/2023 09:00 GENOVA Orale
14/07/2023 09:00 GENOVA Orale
14/07/2023 09:00 GENOVA Esame su appuntamento
12/09/2023 09:00 GENOVA Orale
12/09/2023 09:00 GENOVA Esame su appuntamento