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Computational Fluid

DynamicsSEMINAR I(introduction)

7/30/2019 CFD Seminar

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What is CFDApplications of CFD

CFD research at AUB

CFD Tutorial

Plan

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Maturing technology

adopted by increasing number of industries

still require expert users

An Expanding CFD Community

research and development

applications

Why CFD Seminars?

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CFD Advantages

Research tool

Exploration of flow physics

Design Tool

Simulation based design rather than buildand test

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CFD Applications

Aerospace

Automotive

Chemical Processing

Power Generation

Wing-Body Interaction 

Hypersonic Launch Vehicle

 Aerodynamics

Engine Cooling 

Polymerization reactor vessel - prediction

of flow separation and residence time

effects.

Shear rate distribution in twin- 

screw extruder simulation

Flow in a

burner  

Flow pattern through a water turbine.

7/30/2019 CFD Seminar

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newer CFD Applications

HVAC

Particle traces of copier VOC emissions

colored by concentration level fall 

behind the copier and then circulate

through the room before exiting the

exhaust.

Interior Ventilation

BiomedicalMedtronic Blood Pump

Temperature and natural 

convection currents in the

Appliances

Surface-heat-flux plots of the No-Frost refrigerator and 

freezer compartments helped BOSCH-SIEMENS engineers to

optimize the location of air inlets.

ConstructionFlow vectors and pressure

distribution on an offshore oil rig 

Flow around cooling towers

...

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( ( (

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Microelectronics

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How Does CFD WorkGoverning Equation

as a system ofPartial Differential

Equations

System of AlgebraicEquations

Numerical Solutions

Discretization Method

Finite Difference

Finite VolumeFinite ElementBoundary Element

Solution Method

Combinations of 

Multigrid MethodsIterative Solvers

Coupled-Uncoupled techniques

Geometric Discretization

Structured GridsCartesian, Non-Orthogonal)

Block Structured gridsUnstructured GridsChimera Grids

7/30/2019 CFD Seminar

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Geometric

Discretization

( (

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( ( ( ( (

( ( ( ( ( ( ( (( (

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QE9

R@9%4 

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Geometric Discretization

Structured GridsCartesian, Non-Orthogonal)

Block Structured gridsUnstructured GridsChimera Grids

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Equation Discretization

P

F1

F4

F3

F2

Neighbor 1 Cells

Neighbor 2 Cells 

∂ ρφ ( )∂t 

+ ∇ ⋅ ρ vφ ( ) = ∇ ⋅ Γ ∇φ ( )+ S φ 

 

∇ ⋅ Γ ∇φ ( )d ΩΩ

 ∫∫ 

 

Γ∇φ ( ) ⋅ d S

∂Ω

 ∫ 

 

Γ∇φ ( ) f ⋅ S f 

 f (∂Ω)

∑

P F

f 

dPF

Sf 

 

∇φ ( ) f =

φ  N  −φ P

PN + ...

Discretization Method

Finite DifferenceFinite VolumeFinite Element

Boundary Element

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Solving the Algebraic

Equations

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CFD Research at AUB

Started in early 1990’s

Development in many key areas

accuracy enhancement

robust algorithms

complex physics

http://webfea.fea.aub.edu.lb/fea/me/CFD

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High Performance

Parallel Computing

Demo

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Fluent/Gambit

Free-SurfaceDEMO