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## SHIP NUMERICALHYDRODYNAMICS

CODE 84419 2021/2022 6 cfu during the 2nd year of 8738 INGEGNERIA NAVALE (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 marne indusstry, 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 design and analysis problems

## AIMS AND CONTENT

### LEARNING OUTCOMES

LEARNING OUTCOMES:

Introduction to the latest 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 and computer lab.

### 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

SHIP NUMERICALHYDRODYNAMICS

## EXAMS

### EXAM DESCRIPTION

Oral talk with presentation of the results of a home assignment

### ASSESSMENT METHODS

Presentation of results and critical discussion of the outcommes of the home assigments. Identification of applicability fields, possible different formulation of the problem, limitations and field of applicability of the developed numerical approach.

### Exam schedule

Date Time Location Type Notes
11/01/2022 09:00 GENOVA Esame su appuntamento
11/01/2022 09:00 GENOVA Orale
28/01/2022 09:00 GENOVA Esame su appuntamento
28/01/2022 09:00 GENOVA Orale
14/02/2022 09:00 GENOVA Esame su appuntamento
14/02/2022 09:00 GENOVA Orale
03/06/2022 09:00 GENOVA Esame su appuntamento
03/06/2022 09:00 GENOVA Orale
30/06/2022 09:00 GENOVA Esame su appuntamento
30/06/2022 09:00 GENOVA Orale
19/07/2022 09:00 GENOVA Esame su appuntamento
19/07/2022 09:00 GENOVA Orale
13/09/2022 09:00 GENOVA Esame su appuntamento
13/09/2022 09:00 GENOVA Orale