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7/23/2019 Fluent Nov 2003
1/27
Using FLUENT inDesign &
OptimizationDevendra Ghate, Amitay Isaacs,
!"dha#ar, A G $arathe, % $ $""mdar
Centre for Aerospace Systems Design and Engineering
Department of Aerospace Engineering, IIT Bombay
http://www.casde.iitb.ac.in/
http://www.casde.iitb.ac.in/http://www.casde.iitb.ac.in/http://www.casde.iitb.ac.in/http://www.casde.iitb.ac.in/http://www.casde.iitb.ac.in/http://www.casde.iitb.ac.in/7/23/2019 Fluent Nov 2003
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FLUENT CFD Conference 2003 2
O"t'ine
(FD in design
%ro)'em statement
D"ct parametrization
F'o* so'"tion
+es"'ts
(onc'"sion
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FLUENT CFD Conference 2003 3
Using (FD in Design
!im"'ation Time (FD is ta#es h"ge amo"nts o time or rea' 'ie pro)'ems Design re-"ires repetitive r"ns o discip'inary ana'yses
Integration .ith optimizer .ith other discip'inary ana'yses /e0g0 grid generator1
A"tomation No "ser interaction sho"'d )e re-"ired or sim"'ation
Gradient Inormation No commercia' (FD so'vers provide gradient inormation (omp"tationa''y e2pensive and pro)'ematic / 1
to get gradient inormation or (FD so'vers /3nitedi4erence, a"tomatic di4erentiation1
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FLUENT CFD Conference 2003 4
$ethodo'ogy
Problem Specification
Parametrization
New parameters
eometr! eneration
ri" eneration
CFD problem set#p
Flow Sol#tion
$ptimization #sin%
S#rro%ate &o"els
'(S&) D*CE+
7/23/2019 Fluent Nov 2003
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FLUENT CFD Conference 2003 ,
$ethodo'ogy
Problem Specification
Parametrization
New parameters
eometr! eneration
ri" eneration
CFD problem set#p
Flow Sol#tion
$ptimization #sin%
S#rro%ate &o"els
'(S&) D*CE+
FLUENT
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FLUENT CFD Conference 2003 -
56D D"ct Design %ro)'em
Entry E2it
Location and shape #no*n
Geometry o d"ct rom Entry to E2it 7
%ress"re +ecovery8 Distortion8 !*ir'
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FLUENT CFD Conference 2003 .
%arametrization
Y
X
Z
XDuct
Centerline
A
X
(ontro' 9 Design
:aria)'es
8 ;m,
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FLUENT CFD Conference 2003 /
%arametrization/contd01
Y
X
Z
XDuct
Centerline
A
X
(ontro' 9 Design
:aria)'es
8 ;m,
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FLUENT CFD Conference 2003
Typica' 5D6D"cts
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FLUENT CFD Conference 2003 10
Grid Generation
eneration of entr! an" eit
sections #sin% *&T
Cl#sterin% Parameters
Con5ersion of file format to
CNS #sin% FLUENT
&es6 file
eneration of str#ct#re" 5ol#me
%ri" #sin% parametrizationri" parameters
Entr! 7 Eit sections
Con5ersion of str#ct#re" %ri"
to #nstr#ct#re" format
Complete %ri" %eneration process is
a#tomate" an" "oes not re8#ire
6#man inter5ention
Complete control o5er
9 Distance of t6e first cell from t6e wall
9 Cl#sterin%
9 N#mber of %ri" points
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FLUENT CFD Conference 2003 11
T"r)"'ence $ode'ing+e'evance> Time per !o'"tion
Fo''o*ing aspects o the ?o* *ere o interest> @o"ndary 'ayer deve'opment F'o* !eparation /i any1 T"r)"'ence Deve'opment
Literat"re !"rvey Doy'e night, !mith, ar'o4, Loe4er
(irc"'ar cross6section
!6shaped d"ct
@a'd*in6Loma2 mode' /A'ge)raic mode'1 (omp"tationa''y ine2pensive than more sophisticated mode's
no*n to give non6acc"rate res"'ts or )o"ndary 'ayer separation etc0
#6rea'iza)'e t"r)"'ence mode' T*o e-"ation mode' !t"dy )y Deva#i +avi "mar & !"ata @andyopadhyay /FLUENT
Inc01
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FLUENT CFD Conference 2003 12
T"r)"'ence $ode'ing /contd01
!tandard #6mode' T"r)"'ence :iscosity +atio
e2ceeding B,CC,CCC in =95ce''s
+ea'iza)'e #6mode' !hih et0 a'0 /B1 ( is not ass"med to )e
constant
A orm"'ation s"ggestedor ca'c"'ating va'"es o(B & (
(omp"tationa''y 'itt'emore e2pensive than thestandard #6mode'
Total Press#re profile at t6e
eit section 'Stan"ar" :; mo"el+
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FLUENT CFD Conference 2003 13
Distortion Ana'ysisD(CH /%AC %Cmin1 9-
*here,
%AC 6 average tota' press"re at the section,
%Cmin
6 minim"m tota' press"re in a CCsector, - 6 dynamic press"re at the crosssection0
User De3ned F"nctions /UDF1 and scheme 3'es*ere "sed to generate this inormation rom the
FLUENT case and data 3'e0Iterations may )e stopped *hen the distortionva'"es sta)i'ize at the e2it section *ithreasona)'e convergence 'eve's0
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FLUENT CFD Conference 2003 14
%ara''e' E2ec"tion
%ara''e' mode o operation in FLUENT
B6noded Lin"2 c'"ster
%orta)'e @atch !ystems orsched"'ing
@atch mode operation o FLUENT /6
g1!ca'e "p depends on grid size
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FLUENT CFD Conference 2003 1,
+es"'ts> Tota' %ress"re
%ro3'e
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FLUENT CFD Conference 2003 1-
+es"'ts /contd01
$ass im)a'ance> C0BJKEnergy im)a'ance>C0CK
Tota' press"re drop> B0=K:ario"s t"r)"'ence re'ated -"antities o interest at entryand e2it sections>
Entry E2it
T"r)"'ent ineticEnergy
B=0= 0
T"r)"'ent :iscosity
+atio =CB0 5=MM0
!
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FLUENT CFD Conference 2003 1.
!'apping
These are huge benefits as compared to the efforts involved.
$ethodo'ogy !tore the so'"tion in case & data 3'es
Open the ne* case /ne* grid1 *ith the o'd data 3'e
!et"p the pro)'em
!o'"tion o /C0B C05B B B1 d"ct s'apped on /C0B C05B C0B C0B1
3;"eca"e;fall -;"eca"e;fall
.itho"t s'apping =
.ith s'apping B5 MM%ercentage timesaving
JCK 5CK
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FLUENT CFD Conference 2003 1/
(onc'"sion
Time for sim#lation 6as been
re"#ce" to aro#n" 20? #sin%
parallel comp#tation an"
slappin%>
0 20 40 -0 /0 100
Time (hrs)
Time per CFD Run
Serial Run
Parallel Run
Slapping
Process of %eometr! 7 %ri" %eneration 6as been a#tomate" re8#irin%
no interacti5e #ser inp#t FLUENT 6as been c#stomize" for eas! inte%ration into an optimization
c!cle
CFD anal!sis mo"#le rea"! for incl#sion in optimization for a real life
problem
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FLUENT CFD Conference 2003 1
F"t"re .or#
F"rther e2p'oration andimprovement o s'apping
methodo'ogyIdenti3cation and assessment ooptim"m optimization a'gorithm
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Than# ;o"
http>99***0casde0iit)0ac0in9mdo95d6d"ct9
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FLUENT CFD Conference 2003 21
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FLUENT CFD Conference 2003 22
%ro)'em !tatement
9* "iff#sin% S;s6ape" "#ct9*mbient con"itions@ 11Am altit#"e9nlet o#n"ar! Con"itions
9Total Press#re@ 34,00 Pa9Total Temperat#re@ 2-1>4o A9B!"ra#lic Diameter@ 0>34m9T#rb#lence ntensit!@ ,?
9$#tlet o#n"ar! Con"itions9Static Press#re@ 310,1 Pa 'Calc#late" for t6e "esire" mass flow rate+9B!"ra#lic Diameter@ 0>4.02m9T#rb#lence ntensit!@ ,?
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FLUENT CFD Conference 2003 23
D"ct %arameterizationGeometry o the d"ct is derivedrom the $ean F'o* Line /$FL1 $FL is the 'ine oining centroids o
cross6sections a'ong the d"ct Any cross6section a'ong 'ength o the
d"ct is norma' to $FL
(ross6section area is varied
parametrica''y(ross6section shape in mergingarea is same as the e2it section
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FLUENT CFD Conference 2003 24
$FL Design :aria)'es 6 B
$ean ?o* 'ine /$FL1 is considered asa piece*ise c")ic c"rve a'ong the'ength o the d"ct )et*een the entry
section and merging section
y!", #!"
$ %m%m/&
y!%m/&", #!%m/&" specified
Centry
Cmerger
y', #'
y&, #&
%m : (distance between the entry and merger section
y', y&, #', #& : c)bic po*ynomia*s for y!" and #!"
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FLUENT CFD Conference 2003 2,
$FL Design :aria)'es 6 =+ y'!" A$- A' - A&
&- A, y&!" B$- B' - B&
&- B
+ #'!" C$- C' - C&&- C
, #&!" D$- D' - D&&- D
+ y'!%m" y& !%m", y'!%m" y&!%m", y'0!%m" y&0!%m"
+ #'!%m" #& !%m", #'!%m" #&!%m", #'0!%m" #&0!%m"
+ y'!Centry" y&!Cmerger" #' !Centry" #&!Cmerger" $
+ The shape of the 12% is contro**ed by & parameters whichcontro* the y and # coordinate of centroid at %m/&
+ y!%m/&" y!$" - !y!%" 3 y!$"" 4y $ 5 4y5 '
+ #!%m/&" #!$" - !#!%" 3 #!$"" 4
#$ 5 4
#5 '
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FLUENT CFD Conference 2003 2-
Area Design :aria)'es B
(ross6section area at any station is interpo'atedrom the entry and e2it cross6sections
+A!" A!$" - !A!%m"3A!$"" 6 7!"
+corresponding points on entry and
eit sections are *inear*y interpo*ated
to obtain the shape of the intermediatesections and sca*ed appropriate*y
+8section 8entry -!8eit( 8entry" 6 7
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FLUENT CFD Conference 2003 2.
Area Design :aria)'es 6 =
A$- A' - A&&- A
$ 7 5 7'
B$- B' - B&&- B
7'7 7&
C$- C' - C&&- C
7&5 7 '
7
7!"
$ %m
%m
/
$
'
&%m
/
7'
7&
7!%m/" and 7!&%m/" is specified
7 9ariation is gi9en by piecewise c)bic c)r9e as f)nction of