Category Archives: civil engineering

The Motions of A Moored Ship in Waves


The Motions of A Moored Ship in Waves – PhD Thesis

TOC

1. INTRODUCTION

2. POTENTIAL THEORY DESCRIPTION IN THE FREQUENCY DOMAIN
2.1. A general hydrodynamic approach to harmonic ship motions
2.2. The equations of motion in the frequency domain
2.3. The determination of the velocity potential
2.4. The potential for a ship along a quay

3. WAVE EXCITED FORCES AND RMRODYNAMIC COEFFICIENTS
3.1. Numerical calculations with the 3-dimensional source technique
3.2. Experimental verification
3.3. Discussion of the results
3.4. The influence of the water depth on added mass and damping
3.5. The influence of a quay parallel to the ship on added mass and damping

4. EQUATIONS OF MOTION IN THE TIME DOMAIN
4.1. Potential theory description for flow due to arbitrary ship motions
4.2. Equations of motion in the time domain
4.3. Relation between equations in the time and frequency domain
4.4. The behaviour of the damping for high frequency motions
4.5. Numerical computations of retardation functions and constant inertia coefficients

5. THE APPLICATION OF THE EQUATIONS OF MOTION IN THE TIME DOMAIN
5.1. General
5.2. Numerical calculations
5.3. Examples of computed moored ship motions and experimental verification
5.4. Analysis of the results
5.5. Extension to other systems

6. CONCLUSIONS

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Foundation Settlement Analysis

Foundation Settlement Analysis

TOC

1. INtroduction

2. Analysis and Design Methods
2.2 Desirable Attributes of Practical Analysis and Design Methods
2.3 Categories of Analysis and Design Methods

3. Settlement Analysis of Shallow Foundations on Clay
3.1 One-Dimensional versus Three-Dimensional Settlement Analysis
3.2 Effects of Local Yields
3.3 Case Study
3.4 Rate of Settlement
3.5 Creep and Secondary Consolidation

4. Settlement of Shallow Foundations on Sand
4.1 Previous Studies
4.2 Case Study

5. Analysis of Raft and Strip Foundations
5.1 Introduction
5.2 Subgrade Reaction versus Elastic Continuum Soil Models
5.3 The Analysis of a Raft as a Series of Strip Footings
5.4 The Effects of Structure-Foundation-Soil Interaction

6. Settlement of Pile Groups

7. The Pivotal Role of Parameter Assessment

8. Conclusions

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Energy Simulation in Building Design

Energy Simulation in Building DesignPpt Lecture Notes

CONTENTS :

Course introduction and terminology

Heat transfer review

Solar radiation

Thermal processes in building elements

Thermal processes in indoor environment

Modeling, Introduction to MathCAD

System of equations,  Introduction to  eQUEST

Unsteady-state heat transfer

Numerical methods for solving system of equations

System of equations for the wall, zone, building

Linearization of building energy equations

Modeling

HVAC systems

Modeling of HVAC systems

HVAC and eQUEST software

Same notes like for the previous class

Building simulation software

Review for the Midterm Test

Review and available ES software

Final project assignment

Differences between ES software

Interaction of building envelope and  HVAC system

Building simulation and accuracy

Airflow modeling and Energy simulation

ES for LEED certification,  engineering problems, and research

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Time-Domain Calculations of Drift Forces and Moments

Time-Domain Calculations of Drift Forces and Moments

TOC

1 Problem Definition and Mathematical Model
1.1 Physical problem
1.2 Mathematical model
1.3 Linearization of the boundary conditions
1.3.1 Free-surface condition
1.3.2 Body boundary condition
1.4 Forces and moments
1.4.1 Perturbation series
1.4.2 Hydrodynamic coefficients and equation of motion
1.4.3 Drift forces and moments
1.5 Double-body potential

2 Numerical Method
2.1 Introduction
2.2 Boundary-integral method
2.2.1 Discretization of the boundary conditions
2.3 Time integration
2.3.1 Algorithm for zero speed
2.3.2 New algorithm for forward speeds
2.3.3 Suggestion concerning time integration of non-linear equations
2.4 Matrix solver

3 Two-dimensional test problem: cylinder of infinite length
3.1 Introduction
3.2 Simplified model
3.3 Numerical aspects
3.3.1 Convergence and stability
3.3.2 Effectiveness of absorbing boundary condition
3.4 Results
3.4.1 Comparison of results found by using the doublebody potential and the undisturbed-flow potential

4 Three-dimensional test problem: floating sphere
4.1 Introduction
4.2 Mathematical model
4.2.1 Absorbing boundary condition
4.3 Numerical aspects
4.4 Results

5 Results for a 200kDWT tanker
5.1 Introduction
5.2 Mathematical model
5.3 Numerical aspects
5.3.1 Numerical differentiation on the hull
5.3.2 Double-body potential
5.4 Results
5.4.1 Hydrodynamic coefficients
5.4.2 Improvement of roll damping
5.4.3 Drift forces and moments
5.5 Conclusions and recommendations

6 General time signals
6.1 Introduction
6.2 General absorbing-boundary condition
6.3 Step-response functions
6.3.1 Fitting of the step-response function using Laguerre polynomials
6.3.2 Results
6.3.3 Forward speed effects
6.4 Slow-drift forces
6.4.1 Results for infinite depth
6.4.2 Results for finite depth
6.5 Conclusions

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Biochar Application to Soils

Biochar Application to Soils

TOC

1. BACKGROUND AND INTRODUCTION
1.1 Biochar in the attention
1.2 Historical perspective on soil improvement
1.3 Different solutions to similar problems
1.4 Biochar and pyrogenic black carbon
1.5 Carbon sequestration potential
1.5.1 Biochar loading capacity
1.5.2 Other greenhouse gasses
1.6 Pyrolysis
1.6.1 The History of Pyrolysis
1.6.2 Methods of Pyrolysis
1.7 Feedstocks
1.8 Application Strategies

2. PHYSICOCHEMICAL PROPERTIES OF BIOCHAR
2.1 Structural and Chemical Composition
2.1.1 Structural composition
2.1.2 Chemical composition and surface chemistry
2.2 Particle size distribution
2.2.1 Biochar dust
2.3 Pore size distribution and connectivity
2.4 Thermodynamic stability
2.5 CEC and pH

3. EFFECTS ON SOIL PROPERTIES, PROCESSES AND FUNCTIONS
3.1 Properties
3.1.1 Soil Structure
3.1.1.1 Soil Density
3.1.1.2 Soil pore size distribution
3.1.2 Water and Nutrient Retention
3.1.2.1 Soil water repellency
3.1.3 Soil colour, albedo and warming
3.1.4 CEC and pH
3.2 Soil Processes
3.2.1 Environmental behaviour, mobility and fate
3.2.2 Sorption of Hydrophobic Organic Compounds (HOCs)
3.2.3 Nutrient retention/availability/leaching
3.2.4 Contamination
3.2.5 Soil Organic Matter (SOM) Dynamics
3.2.5.1 Recalcitrance of biochar in soils
3.2.5.2 Organomineral interactions
3.2.5.3 Accessibility
3.2.5.4 Priming effect
3.2.5.5 Residue Removal
3.2.6 Soil Biology
3.2.6.1 Soil microbiota
3.2.6.2 Soil meso and macrofauna
3.2.6.3 Soil megafauna
3.3 Production Function
3.3.1 Meta-analysis methods
3.3.2 Meta-analysis results
3.3.3 Meta-analysis recommendations
3.3.4 Other components of crop production function

4. BIOCHAR AND ‘THREATS TO SOIL’
4.1 Soil loss by erosion
4.2 Decline in soil organic matter
4.3 Soil contamination
4.4 Decline in soil biodiversity
4.6 Soil compaction
4.7 Soil salinisation

5. WIDER ISSUES
5.1 Emissions and atmospheric pollution
5.2 Occupational health and safety
5.3 Monitoring biochar in soil
5.4 Economic Considerations
5.4.1 Private costs and benefits
5.4.2 Social costs and benefits
5.5 Is biochar soft geo-engineering?

6. KEY FINDINGS
6.1 Summary of Key Findings
6.1.1 Background and Introduction
6.1.2 Physicochemical properties of Biochar
6.1.3 Effects on soil properties, processes and functions
6.1.4 Biochar and soil threats
6.1.5 Wider issues
6.2 Synthesis
6.2.1 Irreversibility
6.2.2 Quality assessment
6.2.3 Scale and life cycle
6.2.4 Mitigation/adaptation
6.3 Knowledge gaps
6.3.1 Safety
6.3.2 Soil organic matter dynamics
6.3.3 Soil biology
6.3.4 Behaviour, mobility and fate
6.3.5 Agronomic effects

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