tut03 (2)

This tutorial demonstrates how to set up and solve a transient problem.
The goal is to determine the time variation of theflow and temperature distributions within the cabinet.
In this tutorial,you will learn how to:
•Define a transient problem
•Specify time-dependent parameters for objects
•Group and copy modeling objects
•Examine the results of a transient simulation,including animating results over
time
Prerequisites:This tutorial assumes that you are familiar with the menu structure in Icepak and that you have solved or read Tutorial1.Some steps in the setup and solution procedure will not be shown explicitly.
Problem Description:The model consists of a natural-convection-cooled heat sink composed of a base plate,four heat sources,and nine taperedfins,as shown in Figure3.1.The sources are attached to the back of the base plate and each is turned on for10seconds,one after the other.
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Transient Analysis
Transient Analysis
Problem setup−→
Transient Analysis
Transient Analysis
Transient Analysis
Model−→
xS0.05xE0.35
yS0.1yE0.55
zS0.05zE0.25
xS0.1xE0.3
yS0.2yE0.4
zS0.12zE—
button located next to the Solid material textfield to open the drop-down list.Al-Duralumin is located in the Metals/Alloys
category,so you will need to scroll down through the drop-down list tofind
it.
(i)Click Done to modify the plate and close the Plates panel.
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Transient Analysis
yC0.25
The Copy blockfin panel will open.
(c)Enter2as the Number of copies.
(d)Turn on the Translate option and specify an X offset of0.05.
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Transient Analysis
Transient Analysis
xS0.12xE0.18
yS0.22yE0.28
zS0.12zE—
Transient Analysis
xS0.22xE0.28
yS0.22yE0.28
zS0.12zE—
xS0.12xE0.18 yS0.32yE0.38 zS0.12zE—xS0.22xE0.28 yS0.32yE0.38 zS0.12zE—
xS0.05xE0.35 yS0.1yE—
zS0.05zE0.25 xS0.05xE0.35 yS0.55yE—zS0.05zE0.25
Figure3.2:Completed Model for the Transient Simulation
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Icepak should report in the Message window that0problems were found and all tolerances are acceptable.
12.Check the definition of the modeling objects to ensure that you specified them
properly.
Edit−→Summary
Icepak will list the specifications for all modeling objects in the Parameter summary panel.You can check them here and then click Done when you are satisfied.If you notice any incorrect specifications,you can change them in the Parameter summary panel by clicking your mouse on the appropriate entry and editing the value.You can also return to the appropriate modeling object panel and change the settings in the same way that you originally entered them.
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Solution settings−→
Solution settings−→
NX0NY0NZ1
(b)Turn on the Show vectors option.
(c)Click Create.
(d)Animate the velocity vectors over time.
Post−→Transient settings
i.Select Time value in the Post-processing time panel.
ii.Click Animate to display the Transient animation panel.
iii.Keep the default settings in the Transient animation panel and click Ani-mate to start the animation.
The animation will begin,and the display will show the velocity vectors for the
solution at each time.Airflows from one opening to the other(and passes
through thefins of the heat sink);you can also see that the velocity distribu-
tion changes with time from the initial velocity profile to that governed by the
geometry and other parameters of the system.
Figure3.5shows the velocity vectors at t=20.
To stop the animation,click the red Interrupt button in the upper right hand
corner of the Icepak interface,
(e)Click Done to close the Transient animation panel.
(f)Click Done to close the Post-processing time panel.
(g)In the Plane cut panel,turn offthe Active option and click Done.
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