Intro to Computer Simulations with ANSYS

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Questions and Answers

What is the primary simulation tool mentioned for macroscopic simulations in this course?

OpenFOAM

Solidworks

ANSYS workbench (correct)

Comsol

Which type of analysis is associated with the Navier Stokes equations?

Boundary condition analysis

Transient thermal analysis

Static thermal analysis

Computational Fluid Dynamics analysis (correct)

What type of analysis will be covered in the first two weeks of the course?

Boundary condition analysis

Macroscopic simulation analysis

Computational Fluid Dynamics analysis

Static or transient thermal analysis (correct)

Which of the following tools is NOT mentioned as an alternative to ANSYS for simulations?

Matlab (C) Signup and view all the answers

What aspect of temperature does the flow rate and outdoor temperature primarily affect within the train?

Temperature distribution (B) Signup and view all the answers

What increases the importance of solving larger scale problems in recent times?

Growing complexity of problems and increase in computing power (C) Signup and view all the answers

What does the traffic simulation at a microscopic level consider?

Individual vehicles with their own governing equations (C) Signup and view all the answers

What is a significant challenge in the current era when solving problems according to recent developments?

Larger scale problems with more interactions (A) Signup and view all the answers

Which application does not span across various scales according to the information?

Game theory analysis (D) Signup and view all the answers

What are computational methods commonly utilized for in the context of modern problems?

As a systematic means to make progress on complex problems (D) Signup and view all the answers

What principle underlies the interactions of balls in the described system?

Gravitational forces (C) Signup and view all the answers

Which of the following scales is not mentioned in relation to equation-based simulations?

Astrological level (B) Signup and view all the answers

In what context is the term 'combinatorial explosion' most relevant according to the information provided?

Modeling emergent behaviors in complex systems (C) Signup and view all the answers

What are computer simulations primarily used for?

To calculate how a system behaves over time (D) Signup and view all the answers

Which of the following is NOT a building block of computer simulations?

Real-time user input (A) Signup and view all the answers

In the context of particle-based simulations, what does $F = ma$ represent?

The interaction laws governing particle behavior (A) Signup and view all the answers

What must be defined to initiate the simulation of three balls at rest?

Initial and boundary conditions (A) Signup and view all the answers

Which method is commonly used to approximate changes in systems over time in computer simulations?

Discretization methods (C) Signup and view all the answers

What outcome can be expected for three balls with identical mass at rest after 1 second in a simulation where they are subjected to opposing forces?

They will remain stationary, experiencing forces but no movement (A) Signup and view all the answers

What typically characterizes particle-based simulations compared to field-based simulations?

Particle-based simulations operate on discrete elements rather than continuous fields (C) Signup and view all the answers

Which statement accurately describes the scenario of three balls in a simulation after being at rest?

They will not move unless additional forces are applied (B) Signup and view all the answers

What is one of the primary topics covered in the first week of the module plan?

Introduction to simulations (A) Signup and view all the answers

Which analytical skill is emphasized in the module learning outcomes?

Validating numerical models (C) Signup and view all the answers

How long is the tutorial on 'Transient thermal analysis' scheduled to last?

2 hours (C) Signup and view all the answers

What is one key aspect of the first tutorial on 4th September 2024?

Introduction to simulations (D) Signup and view all the answers

Who is responsible for the module MEC2181 Mechanical Simulation?

Elisa Ang (C) Signup and view all the answers

What will students likely focus on in the workshops during the module?

Hands-on project activities (C) Signup and view all the answers

Which aspect is NOT included in the learning outcomes of the module?

Implement machine learning (D) Signup and view all the answers

When is the quiz scheduled in the module plan?

October 2, 2024 (D) Signup and view all the answers

What topic is not covered in the second week of the module?

CFD workshop part 2 (B) Signup and view all the answers

What type of engineering degree did Elisa Ang earn from NTU, Singapore?

BEng (Hons) Aerospace Engineering (A) Signup and view all the answers

What is the primary focus of the governing equation presented?

Heat conduction in a steady state (C) Signup and view all the answers

What must be assumed for the equation derived to be valid?

Constant thermal conductivity (D) Signup and view all the answers

What initial step is necessary for numerical methods in heat conduction?

Discretization of the domain (A) Signup and view all the answers

What does the equation provided allow one to calculate?

Temperature at discrete points (B) Signup and view all the answers

Which numerical method is associated with handling discontinuities?

Finite Volume Method (D) Signup and view all the answers

What is a characteristic feature of the Finite Difference Method?

Applies the differential form of governing equations (D) Signup and view all the answers

In the discretized temperature equation for $T_1$, what does the equation relate to?

Involvement of temperature at multiple points (C) Signup and view all the answers

Why is it important to be aware of grid fineness in simulations?

It influences the accuracy of the temperature distribution (D) Signup and view all the answers

Which method would likely provide better accuracy for complex geometries?

Finite Element Method (B) Signup and view all the answers

Which aspect is not typically handled by the Finite Volume Method?

Time-dependent transient states (B) Signup and view all the answers

What is an essential step in solving for $T_2$, $T_3$, and $T_4$?

Simultaneous equation solving (B) Signup and view all the answers

What does the term 'steady state' imply in heat conduction analysis?

No internal heat generation occurs (A) Signup and view all the answers

In order to get a finer temperature distribution, what is often required?

Finer grid spacing (C) Signup and view all the answers

What does the equation $4T(x,y) = T(x+ riangle x,y) + T(x- riangle x,y) + T(x,y+ riangle y) + T(x,y- riangle y)$ represent?

Steady state temperature relations (C) Signup and view all the answers

Study Notes

Course Introduction and Overview

Instructor is Elisa Ang
Other instructors: Dr Lim Yau Shiang, Prof Victor Wang, Dr Peter Beshay, Dr Zhang Lanyue, Dr Naseeb Siddiqui
Module outcomes: describe discretization for numerical solutions, formulate and validate numerical models in ANSYS

Course Schedule

Week 1: Introduction to simulations, introduction to ANSYS workbench, brainstorming on project
Week 2: Mesh dependence study, transient thermal analysis, processing tools in Ansys thermal analysis, self practice
Week 3: CFD workshop part 1 (external flow), self practice
Week 4: CFD workshop part 2 (transient internal flow), self practice
Week 5: Quiz
Week 8 and 9: Project work
Week 10: Project presentations

Computer simulations

Calculations using computers that model system behaviour over time based on rules and behaviours
Are important due to increasing problem complexity and computing power
Can be field-based or particle-based

Building blocks of computer simulations

Governing and interaction laws
Initial and boundary conditions
Discretization methods

Types of Simulations

Atomic/molecular level: used to understand material properties
Mesoscopic level: used to model complex systems like traffic simulations
Continuum level: used to model fluid flows and heat transfer

ANSYS Workbench

Used for continuum level simulations
Main focus of this module

Governing Equations and Analyses

Static or transient thermal analysis: uses the general heat conduction equation (week 1 and 2)
Computational Fluid Dynamics (CFD): uses Navier-Stokes equations (week 3 and 4)

Introduction to Numerical Methods using Heat Conduction Analysis

Goal is to solve the general heat conduction equation without internal heat generation for a 2D steady-state problem with constant thermal conductivity.
First step involves discretization of the domain and governing equation
Discretized equation is then used to find the temperature for each node
Finite difference (FD), finite volume (FV) and finite element (FEM) methods are used to solve the discretized equation

Pre-lab Exercise

Solves a heat conduction problem using ANSYS
Solves for the temperature distribution of a flat plate with known boundary temperatures using a discretization of the domain
Using ANSYS to solve the same problem

FDM, FVM, and FEM

Finite difference method (FD): uses differential form of the governing equation, suitable for continuous functions and structured domains
Finite volume method (FV): uses integral form of the governing equation, suitable for discontinuities and works with ANSYS
Finite element method (FEM): uses weak form of the differential equation, provides higher accuracy and is suitable for complex domains, works with ANSYS

ANSYS Simulations

Solving the pre-lab exercise using ANSYS
Focusing on flat plate heat transfer problem

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Description

This quiz covers the fundamentals of computer simulations, focusing on the use of ANSYS for numerical solutions. You'll explore topics like discretization, transient thermal analysis, and computational fluid dynamics workshops. Prepare to validate models and analyze complex system behaviors.