Flunt帮助算例总结
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1. Introduction to Using FLUENT
The problem to be considered is shown schematically in Figure 1.1. A cold fluid
at 26 C enters through the large pipe and mixes with a warmer fluid at 40
C in the elbow. The pipe dimensions are in inches, and the fluid properties and
boundary conditions are given in SI units. The Reynolds number at the main inlet
is 2.03 10 5, so that a turbulent model will be necessary.
Figure 1.1: Problem Specification
Preparation
1. Copy the file elbow/elbow.msh from the FLUENT documentation CD to your working
directory.
For UNIX systems, you can find the file by inserting the CD into your CD-ROM
drive and going to the following directory:
/cdrom/fluent6.0/help/tutfiles/
where cdrom must be replaced by the name of your CD-ROM drive.
For Windows systems, you can find the file by inserting the CD into your
CD-ROM drive and going to the following directory:
cdrom :\fluent6.0\help\tutfiles\
where cdrom must be replaced by the name of your CD-ROM drive (e.g., E).
2. Start the 2D version of FLUENT. 2. Modeling Periodic Flow and Heat Transfer
Problem Description
This problem considers a 2D section of a tube bank. A schematic of the problem
is shown in Figure
2.1. The bank consists of uniformly spaced tubes with a
diameter of 1 cm, that are staggered in the direction of cross-fluid flow. Their
centers are separated by a distance of 2 cm in the x direction, and 1 cm in the
ydirection. The bank has a depth of 1 m.
Because of the symmetry of the tube bank geometry, only a portion of the domain
needs to be modeled. The computational domain is shown in outline in Figure
2.1.
A mass flow rate of 0.05 kg/s is applied to the inflow boundary of the periodic
module. The temperature of the tube wall ( ) is 400 K and the bulk
temperature of the cross-flow water ( ) is 300 K. The properties of water
that are used in the model are shown in Figure 2.1.
Figure 2.1: Schematic of the Problem
Preparation
1.
Copy the file tubebank/tubebank.msh from the FLUENT documentation CD to
your working directory (as described in Tutorial
1).
2.
Start the 2D version of FLUENT.
3. Modeling External Compressible Flow
Problem Description
The problem considers the flow around an airfoil at an incidence angle of
and a free stream Mach number of 0.8 ( ). This flow is transonic, and
has a fairly strong shock near the mid-chord ( x/ c = 0.45) on the upper (suction)
side. The chord length is 1 m. The geometry of the airfoil is shown in Figure
3.1.
Figure 3.1: Problem Specification
Preparation
1.
Copy the file airfoil/airfoil.msh from the FLUENT documentation CD to your
working directory (as described in Tutorial 1).
2.
Start the 2D version of FLUENT.
4. Modeling Unsteady Compressible Flow
5. Modeling Radiation and Natural Convection
6. Using a Non-Conformal Mesh
Problem Description
This problem considers a model of a 3D section of a film cooling test rig. A
schematic is shown in Figures 6.1 and 6.2. The problem consists of a duct, 24.5
in long, with cross-sectional dimensions of 0.75 in 5 in. An array of uniformly
spaced holes is located at the bottom of the duct. Each hole has a diameter of
0.5 inches, is inclined at 35 degrees, and is spaced 1.5 inches apart laterally.
Cooler injected air enters the system through the plenum, with cross-sectional
dimensions of 3.3 in 1.25 in.
Because of the symmetry of the geometry, only a portion of the domain needs to
be modeled. The computational domain is shown in outline in Figure 6.2. The
bulk temperature of the streamwise air ( ) is 273 K, and the velocity of
the air stream is 20 m/s. The bottom wall of the duct that intersects the hole
array is assumed to be a completely insulated (adiabatic) wall. The secondary
(injected) air enters the plenum at a uniform velocity of 0.4559 m/s. The
temperature of the injected air ( ) is 136.6 K. The properties of air that
are used in the model are shown in Figure
6.2.
Figure 6.1: Schematic of the Problem, Front View
Figure 6.2: Schematic of the Problem, Top View
Preparation
1.
Copy the files filmcool/film_hex.msh and filmcool/film_tet.msh from the
FLUENT documentation CD to your working directory (as described in
Tutorial 1).
Step 1: Merging the Mesh Files
1.
