Simulation of Laminar Pipe Flows
57:020 Mechanics of Fluids and Transport Processes
CFD PRELAB 1
By Tao Xing and Fred Stern
The University of Iowa
C. Maxwell Stanley Hydraulics Laboratory
Iowa City, IA 522421585
1. Purpose
The Purpose of CFD PreLab 1 is to teach students how to use the CFD educational interface (FlowLab
1.2.10), be familiar with the options in each step of CFD Process, and relate simulation results to AFD
concepts. Students will simulate
laminar
pipe flow following the “CFD process” by an interactive
stepbystep approach. Students will have “handson” experiences using FlowLab to compute axial
velocity profile, centerline velocity, centerline pressure, and friction factor. Students will compare
simulation results with AFD data, analyze the differences and possible numerical errors, and present
results in CFD Lab 1 report.
Flow chart for ISTUE teaching module for pipe flow (red color illustrates the options you will
use in CFD PreLab 1)
2. Simulation Design
1
Coarse
Medium
Fine
Automatic
Manual
Structured
Unstruct
ured
Geometry
Physics
Mesh
Total pressure
drop
Postprocessing
Wall friction
force
Centerline Velocity
Centerline Pressure
Profiles of Axial
Velocity
Contours
Vectors
Streamlines
Pipe
Pipe Radius
Pipe Length
XY plot
Validation
Verification
Boundary
Conditions
Flow
Properties
Viscous
Models
One Eq.
Two Eq.
Density and viscosity
Laminar
Turbulent
Inviscid
SA
ke
kw
Heat
Transfer?
Incompress
ible?
Initial
Conditions
Solve
Iterations/
Steps
Converge
nt
Limit
Precisions
Single
Double
Numerical
Schemes
1
st
order
upwind
2
nd
order
upwind
Quick
Steady
/
Unsteady?
Report
Operating
Condition
Residual
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View Full DocumentIn EFD Lab 2, you conducted experimental study for
turbulent
pipe flow. The data you have
measured will be used for CFD Lab 1.
In CFD PreLab 1, simulation will be conducted only for
laminar
circular pipe flows, i.e. the Reynolds number is less than 2300. Reynolds number based on
pipe diameter and mean inlet velocity is
654.75
in the current simulation. CFD predictions of friction
factor and fully developed axial velocity profile will be compared with AFD data.
Since the flow is axisymmetric we only need to solve the flow in a single plane from the centerline to
the pipe wall.
Boundary conditions
need to be specified include
inlet
,
outlet
,
wall
, and
axis
, as will
be described in details later. Uniform flow is specified at inlet, the flow will reach the fully developed
regions after a certain distance downstream. Noslip boundary condition will be used on the wall and
constant pressure for the outlet. Symmetric boundary condition will be applied on the pipe axis. Since
the flow is laminar, turbulence models are not necessary.
3. CFD Educational Interface
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 Fall '10
 FredrickStern
 Fluid Dynamics, mechanics, Velocity, FlowLab, axial velocity

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